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path: root/extras/volgen/CreateVolfile.py
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#    Copyright (c) 2009-2010 Gluster, Inc. <http://www.gluster.com>
#    This file is part of GlusterFS.

#    GlusterFS is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published
#    by the Free Software Foundation; either version 3 of the License,
#    or (at your option) any later version.

#    GlusterFS is distributed in the hope that it will be useful, but
#    WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#    General Public License for more details.

#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see
#    <http://www.gnu.org/licenses/>.

import os, sys, string

#Cachesize calculator
cache_size = "`echo $(( $(grep 'MemTotal' /proc/meminfo | sed 's/[^0-9]//g') / 5120 ))`"

class CreateVolfile:

    def __init__ (self, server_dict, server, transport,
                  transports, options, server_array):

        self.host_dict = server_dict
        self.host = server
        self.volume_name = options.volume_name
        self.transport = transport
        self.transports = transports
        self.auth_parameters = options.auth_param
        self.raid_type = options.raid_type
        self.ib_devport = options.ib_dev
        self.conf_dir = options.conf_dir
        self.host_array = server_array
        self.enable_safe_mode = options.enable_safe_mode
        self.volume_size_server = options.size_server
        self.volume_size_client = options.size_client
        self.nfs = options.need_nfs
        self.num_replica = options.num_replica
        self.num_stripe = options.num_stripe
        if options.port:
            self.gfs_port    = options.port
            self.gfs_ib_port = options.port + 1
        else:
            self.gfs_port    = 6969
            self.gfs_ib_port = 6970

    def create_pmap_mount_volfile (self):

        raid_type = self.raid_type

        mount_volfile = "%s/%s-%s.vol" % (self.conf_dir, str(self.volume_name), str(self.transport))
        mount_fd = file ("%s" % (mount_volfile), "w")

        print "Generating client volfiles.. '%s'" % mount_volfile

        cmdline = string.join (sys.argv, ' ')

        mount_fd.write ("## file auto generated by %s\n" % sys.argv[0])
        mount_fd.write ("# Cmd line:\n")
        mount_fd.write ("# $ %s\n\n" % cmdline)

        if raid_type is not None:
            # Used for later usage
            mount_fd.write ("# RAID %d\n" % raid_type)

        mount_fd.write ("# TRANSPORT-TYPE %s\n" % self.transport)
        subvolumes = []
        for host in self.host_dict.keys():
            i = 1
            for export in self.host_dict[host]:
                mount_fd.write ("volume %s-%s\n" % (host,export))
                mount_fd.write ("    type protocol/client\n")
                mount_fd.write ("    option transport-type %s\n" %
                                self.transport)
                mount_fd.write ("    option remote-host %s\n" % host)
                if self.transport == 'ib-verbs':
                    mount_fd.write ("    option transport.ib-verbs.port %d\n" %
                                    self.ib_devport)
                if self.transport == 'tcp':
                    mount_fd.write ("    option transport.socket.nodelay on\n")

                mount_fd.write ("    option remote-subvolume %s\n" % export)
                mount_fd.write ("end-volume\n\n")
                i += 1
                subvolumes.append(str(host) + '-' + str(export))

        # Stripe section.. if given
        if raid_type is 0:
            max_stripe_idx = len (subvolumes) / self.num_stripe
            stripe_idx = 0
            index = 0
            while index < max_stripe_idx:
                mount_fd.write ("volume stripe-%d\n" % index)
                mount_fd.write ("    type cluster/stripe\n")
                mount_fd.write ("#    option block-size 128k\n")
                mount_fd.write ("#    option use-xattr no\n")
                mount_fd.write ("    subvolumes %s" % subvolumes[stripe_idx])
                sub_idx = 1
                while sub_idx < self.num_stripe:
                    mount_fd.write (" %s" % subvolumes[stripe_idx+sub_idx])
                    sub_idx += 1
                mount_fd.write ("\nend-volume\n\n")
                stripe_idx += self.num_stripe
                index +=1

        # Replicate section
        if raid_type is 1:
            max_mirror_idx = len (subvolumes) / self.num_replica
            mirror_idx = 0
            index = 0
            while index < max_mirror_idx:
                mount_fd.write ("volume mirror-%d\n" % index)
                mount_fd.write ("    type cluster/replicate\n")
                mount_fd.write ("    subvolumes %s" % subvolumes[mirror_idx])
                sub_idx = 1
                while sub_idx < self.num_replica:
                    mount_fd.write (" %s" % subvolumes[mirror_idx + sub_idx])
                    sub_idx += 1
                mount_fd.write ("\nend-volume\n\n")
                mirror_idx += self.num_replica
                index += 1

        # Distribute section
        if raid_type is 0:
            subvolumes = []
            flag = 0
            while flag < index:
                subvolumes.append ("stripe-%d" % flag)
                flag += 1

        if raid_type is 1:
            subvolumes = []
            flag = 0
            while flag < index:
                subvolumes.append ("mirror-%d" % flag)
                flag += 1

        if len (subvolumes) > 1:
            mount_fd.write ("volume distribute\n")
            mount_fd.write ("    type cluster/distribute\n")
            mount_fd.write ("#   option unhashed-sticky-bit yes"
                           "  # Used for migrating data while adding new nodes\n")
            mount_fd.write ("#   option min-free-disk 5%"
                           "  # Minimum free disk available on the volume\n")
            mount_fd.write ("    subvolumes %s\n" %
                                 string.join (subvolumes,' '))
            mount_fd.write ("end-volume\n\n")
            subvolumes[0] = "distribute"


        if self.nfs:
            mount_fd.write ("volume nfsxlator\n")
            mount_fd.write ("    type nfs/server\n")
            mount_fd.write ("    subvolumes %s\n" % subvolumes[0])
            mount_fd.write ("#   option rpc-auth.auth-unix         off  #Enabled by default\n")
            mount_fd.write ("#   option rpc-auth.auth-null         off  #Enabled by default\n")
            mount_fd.write ("#   By default all addresses are rejected until allowed.\n")
            mount_fd.write ("#   option rpc-auth.addr.reject       127.*\n")
            mount_fd.write ("#   option rpc-auth.addr.allow        localhost\n")
            mount_fd.write ("    option rpc-auth.addr.%s.allow %s\n" % (subvolumes[0], self.auth_parameters))
            mount_fd.write ("#   By default insecure ports are not allowed.\n")
            mount_fd.write ("#   option rpc-auth.ports.insecure    on\n")
            mount_fd.write ("#   option rpc-auth.ports.<volume>.insecure  on\n")
            mount_fd.write ("#   By default all access is read-write.\n")
            mount_fd.write ("#   option nfs3.<volume>.volume-access       read-only\n")
            mount_fd.write ("#   option nfs3.<volume>.volume-access       read-only\n")
            mount_fd.write ("#   option nfs3.read-size             128Kb\n")
            mount_fd.write ("#   option nfs3.write-size            32Kb\n")
            mount_fd.write ("#   option nfs3.readdir-size          64Kb\n")
            mount_fd.write ("#   option nfs3.<volume>.read-size    64Kb\n")
            mount_fd.write ("#   option nfs3.<volume>.write-size   64Kb\n")
            mount_fd.write ("#   option nfs3.posix1.readdir-size   128Kb\n")
            mount_fd.write ("end-volume\n\n")
            return

        if self.volume_size_client:
            mount_fd.write ("volume quota\n")
            mount_fd.write ("    type features/quota\n")
            mount_fd.write ("    option disk-usage-limit %s\n" % self.volume_size_client)
            mount_fd.write ("#   option minimum-free-disk-limit 10GB\n"
                            "#   minimum free disk value (default) 0\n")
            mount_fd.write ("#   option refresh-interval 10\n")
            mount_fd.write ("    subvolumes %s\n" % subvolumes[0])
            mount_fd.write ("end-volume\n\n")

        if self.enable_safe_mode:
            return

        self.performance_mode (subvolumes[0], mount_fd)

        return

    def performance_mode (self, cluster_subvolume, volfile_fd):

        volfile_fd.write ("volume writebehind\n")
        volfile_fd.write ("    type performance/write-behind\n")
        volfile_fd.write ("    option cache-size 4MB\n")
        volfile_fd.write ("#   option enable-trickling-writes yes # Flush final write calls when network is free\n")
        volfile_fd.write ("#   option enable-O_SYNC yes # Enable O_SYNC for write-behind\n")
        volfile_fd.write ("#   option disable-for-first-nbytes 1 # Disable first nbytes with very small initial writes\n")
        if self.volume_size_client:
            volfile_fd.write ("    subvolumes quota\n")
        else:
            volfile_fd.write ("    subvolumes %s\n" % cluster_subvolume)
            volfile_fd.write ("end-volume\n\n")

        volfile_fd.write ("volume readahead\n")
        volfile_fd.write ("    type performance/read-ahead\n")
        volfile_fd.write ("    option page-count 4\n")
        volfile_fd.write ("#   option force-atime-update yes # force updating atimes, default off\n")
        volfile_fd.write ("    subvolumes writebehind\n")
        volfile_fd.write ("end-volume\n\n")

        volfile_fd.write ("volume iocache\n")
        volfile_fd.write ("    type performance/io-cache\n")
        volfile_fd.write ("    option cache-size %sMB\n" % cache_size)
        volfile_fd.write ("    option cache-timeout 1\n")
        volfile_fd.write ("#   option priority *.html:1,abc*:2 # Priority list for iocaching files\n")
        volfile_fd.write ("    subvolumes readahead\n")
        volfile_fd.write ("end-volume\n\n")

        volfile_fd.write ("volume quickread\n")
        volfile_fd.write ("    type performance/quick-read\n")
        volfile_fd.write ("    option cache-timeout 1\n")
        volfile_fd.write ("    option max-file-size 64kB\n")
        volfile_fd.write ("    subvolumes iocache\n")
        volfile_fd.write ("end-volume\n\n")

        volfile_fd.write ("volume statprefetch\n")
        volfile_fd.write ("    type performance/stat-prefetch\n")
        volfile_fd.write ("    subvolumes quickread\n")
        volfile_fd.write ("end-volume\n\n")

        return

    def create_pmap_export_volfile (self):

        cmdline = string.join (sys.argv, ' ')
        i = 0
        for export in self.host_dict[self.host]:
            export_volfile = "%s/%s-%d.vol" % (self.conf_dir,
                                               str(self.host + '-' + self.volume_name),
                                               i)
            i += 1
            exp_fd = file ("%s" % (export_volfile),"w")

            print "Generating server volfiles.. for server %s as '%s'" % (self.host,
                                                                          export_volfile)

            exp_fd.write ("## file auto generated by %s\n" % sys.argv[0])
            exp_fd.write ("# Cmd line:\n")
            exp_fd.write ("# $ %s\n\n" % cmdline)
            exp_fd.write ("volume posix\n")
            exp_fd.write ("    type storage/posix\n")
            exp_fd.write ("#   option o-direct enable # (default: disable) boolean type only\n")
            exp_fd.write ("#   option export-statfs-size no # (default: yes) boolean type only\n")
            exp_fd.write ("#   option mandate-attribute off # (default: on) boolean type only\n")
            exp_fd.write ("#   option span-devices 8 # (default: 0) integer value\n")
            exp_fd.write ("#   option background-unlink yes # (default: no) boolean type\n")

            exp_fd.write ("    option directory %s\n" % export)
            exp_fd.write ("end-volume\n\n")

            if self.nfs:
                exp_fd.write ("volume posix-ac\n")
                exp_fd.write ("    type features/access-control\n")
                exp_fd.write ("    subvolumes posix\n")
                exp_fd.write ("end-volume\n\n")

            if self.volume_size_server:
                exp_fd.write ("volume quota\n")
                exp_fd.write ("    type features/quota\n")
                exp_fd.write ("    option disk-usage-limit %s\n" % self.volume_size_server)
                exp_fd.write ("#   option minimum-free-disk-limit 10GB"
                              "  # minimum free disk value (default) 0\n")
                exp_fd.write ("#   option refresh-interval 10\n")
                if self.nfs:
                    exp_fd.write ("    subvolumes posix-ac\n")
                else:
                    exp_fd.write ("    subvolumes posix\n")
                exp_fd.write ("end-volume\n\n")

            exp_fd.write ("volume locks\n")
            exp_fd.write ("    type features/locks\n")
            exp_fd.write ("#   option mandatory on # Default off, used in specific applications\n")
            if self.volume_size_server:
                exp_fd.write ("    subvolumes quota\n")
            elif self.nfs:
                exp_fd.write ("    subvolumes posix-ac\n")
            else:
                exp_fd.write ("    subvolumes posix\n")
            exp_fd.write ("end-volume\n\n")

            exp_fd.write ("volume replace-brick\n")
            exp_fd.write ("    type protocol/client\n")
            if self.transport:
                exp_fd.write ("    option transport-type %s\n" % self.transport)
            if self.gfs_port:
                exp_fd.write ("    option transport.remote-port 34034\n")
            exp_fd.write ("    option ping-timeout 42\n")
            exp_fd.write ("end-volume\n\n")

            exp_fd.write ("volume pump\n")
            exp_fd.write ("    type cluster/pump\n")
            exp_fd.write ("    subvolumes locks replace-brick\n")
            exp_fd.write ("end-volume\n\n")

            exp_fd.write ("volume %s\n" % export)
            exp_fd.write ("    type performance/io-threads\n")
            exp_fd.write ("    option thread-count 8\n")
            exp_fd.write ("#   option autoscaling yes # Heuristic for autoscaling threads on demand\n")
            exp_fd.write ("#   option min-threads 2 # min count for thread pool\n")
            exp_fd.write ("#   option max-threads 64 # max count for thread pool\n")
            exp_fd.write ("    subvolumes pump\n")
            exp_fd.write ("end-volume\n\n")

            for transport in self.transports:
                exp_fd.write ("volume server-%s\n" % export)
                exp_fd.write ("    type protocol/server\n")
                exp_fd.write ("    option transport-type %s\n" % transport)
                exp_fd.write ("    option auth.addr.%s.allow %s\n" %
                                  (export, self.auth_parameters))
                if transport == 'ib-verbs':
                    exp_fd.write ("    option transport.ib-verbs.port %d\n" %
                                  self.ib_devport)
                if transport == 'tcp':
                    exp_fd.write ("    option transport.socket.nodelay on\n")
                    exp_fd.write ("    option transport.socket.listen-port %d\n" % self.gfs_port)
                exp_fd.write ("    subvolumes %s\n" % export)
                exp_fd.write ("end-volume\n\n")

        return


    def create_mount_volfile (self):

        raid_type = self.raid_type

        mount_volfile = "%s/%s-%s.vol" % (self.conf_dir, str(self.volume_name), str(self.transport))
        mount_fd = file ("%s" % (mount_volfile), "w")

        print "Generating client volfiles.. '%s'" % mount_volfile

        cmdline = string.join (sys.argv, ' ')

        mount_fd.write ("## file auto generated by %s\n" % sys.argv[0])
        mount_fd.write ("# Cmd line:\n")
        mount_fd.write ("# $ %s\n\n" % cmdline)

        if raid_type is not None:
            # Used for later usage
            mount_fd.write ("# RAID %d\n" % raid_type)

        mount_fd.write ("# TRANSPORT-TYPE %s\n" % self.transport)
        subvolumes = []
        for host in self.host_dict.keys():
            i = 1
            for exports in self.host_dict[host]:
                mount_fd.write ("volume %s-%s\n" % (host,exports))
                mount_fd.write ("    type protocol/client\n")
                mount_fd.write ("    option transport-type %s\n" %
                                self.transport)
                mount_fd.write ("    option remote-host %s\n" % host)
                if self.transport == 'ib-verbs':
                    mount_fd.write ("    option transport.ib-verbs.port %d\n" %
                                    self.ib_devport)
                    mount_fd.write ("    option remote-port %d\n" %
                                    self.gfs_ib_port)
                if self.transport == 'tcp':
                    mount_fd.write ("    option transport.socket.nodelay on\n")
                    mount_fd.write ("    option remote-port %d\n" %
                                    self.gfs_port)

                mount_fd.write ("    option remote-subvolume %s\n" % exports)
                mount_fd.write ("end-volume\n\n")
                subvolumes.append(str(host) + '-' + str(exports))

        # Stripe section.. if given
        if raid_type is 0:
            max_stripe_idx = len (subvolumes) / self.num_stripe
            stripe_idx = 0
            index = 0
            while index < max_stripe_idx:
                mount_fd.write ("volume stripe-%d\n" % index)
                mount_fd.write ("    type cluster/stripe\n")
                mount_fd.write ("#    option block-size 128k\n")
                mount_fd.write ("#    option use-xattr no\n")
                mount_fd.write ("    subvolumes %s" % subvolumes[stripe_idx])
                sub_idx = 1
                while sub_idx < self.num_stripe:
                    mount_fd.write (" %s" % subvolumes[stripe_idx+sub_idx])
                    sub_idx += 1
                mount_fd.write ("\nend-volume\n\n")
                stripe_idx += self.num_stripe
                index +=1

        # Replicate section
        if raid_type is 1:
            max_mirror_idx = len (subvolumes) / self.num_replica
            mirror_idx = 0
            index = 0
            while index < max_mirror_idx:
                mount_fd.write ("volume mirror-%d\n" % index)
                mount_fd.write ("    type cluster/replicate\n")
                mount_fd.write ("    subvolumes %s" % subvolumes[mirror_idx])
                sub_idx = 1
                while sub_idx < self.num_replica:
                    mount_fd.write (" %s" % subvolumes[mirror_idx + sub_idx])
                    sub_idx += 1
                mount_fd.write ("\nend-volume\n\n")
                mirror_idx += self.num_replica
                index += 1

        # Distribute section
        if raid_type is 0:
            subvolumes = []
            flag = 0
            while flag < index:
                subvolumes.append ("stripe-%d" % flag)
                flag += 1

        if raid_type is 1:
            subvolumes = []
            flag = 0
            while flag < index:
                subvolumes.append ("mirror-%d" % flag)
                flag += 1

        if len (subvolumes) > 1:
            mount_fd.write ("volume distribute\n")
            mount_fd.write ("    type cluster/distribute\n")
            mount_fd.write ("#   option unhashed-sticky-bit yes"
                           "  # Used for migrating data while adding new nodes\n")
            mount_fd.write ("#   option min-free-disk 5%"
                           "  # Minimum free disk available on the volume\n")
            mount_fd.write ("    subvolumes %s\n" %
                                 string.join (subvolumes,' '))
            mount_fd.write ("end-volume\n\n")
            subvolumes[0] = "distribute"


        if self.nfs:
            mount_fd.write ("volume nfsxlator\n")
            mount_fd.write ("    type nfs/server\n")
            mount_fd.write ("    subvolumes %s\n" % subvolumes[0])
            mount_fd.write ("#   option rpc-auth.auth-unix         off  #Enabled by default\n")
            mount_fd.write ("#   option rpc-auth.auth-null         off  #Enabled by default\n")
            mount_fd.write ("#   By default all addresses are rejected until allowed.\n")
            mount_fd.write ("#   option rpc-auth.addr.reject       127.*\n")
            mount_fd.write ("#   option rpc-auth.addr.allow        localhost\n")
            mount_fd.write ("    option rpc-auth.addr.%s.allow %s\n" % (subvolumes[0], self.auth_parameters))
            mount_fd.write ("#   By default insecure ports are not allowed.\n")
            mount_fd.write ("#   option rpc-auth.ports.insecure    on\n")
            mount_fd.write ("#   option rpc-auth.ports.<volume>.insecure  on\n")
            mount_fd.write ("#   By default all access is read-write.\n")
            mount_fd.write ("#   option nfs3.<volume>.volume-access       read-only\n")
            mount_fd.write ("#   option nfs3.<volume>.volume-access       read-only\n")
            mount_fd.write ("#   option nfs3.read-size             128Kb\n")
            mount_fd.write ("#   option nfs3.write-size            32Kb\n")
            mount_fd.write ("#   option nfs3.readdir-size          64Kb\n")
            mount_fd.write ("#   option nfs3.<volume>.read-size    64Kb\n")
            mount_fd.write ("#   option nfs3.<volume>.write-size   64Kb\n")
            mount_fd.write ("#   option nfs3.posix1.readdir-size   128Kb\n")
            mount_fd.write ("end-volume\n\n")
            return

        if self.volume_size_client:
            mount_fd.write ("volume quota\n")
            mount_fd.write ("    type features/quota\n")
            mount_fd.write ("    option disk-usage-limit %s\n" % self.volume_size_client)
            mount_fd.write ("#   option minimum-free-disk-limit 10GB\n"
                            "#   minimum free disk value (default) 0\n")
            mount_fd.write ("#   option refresh-interval 10\n")
            mount_fd.write ("    subvolumes %s\n" % subvolumes[0])
            mount_fd.write ("end-volume\n\n")

        if self.enable_safe_mode:
            return

        self.performance_mode (subvolumes[0], mount_fd)

        return

    def create_export_volfile (self):

        cmdline = string.join (sys.argv, ' ')
        export_volfile = "%s/%s-export.vol" % (self.conf_dir, str(self.host + '-' + self.volume_name))
        exp_fd = file ("%s" % (export_volfile),"w")

        print "Generating server volfiles.. for server %s as '%s'" % (self.host,
                                                                      export_volfile)

        exp_fd.write ("## file auto generated by %s\n" %
                      sys.argv[0])
        exp_fd.write ("# Cmd line:\n")
        exp_fd.write ("# $ %s\n\n" % cmdline)
        total_bricks = []
        i=1
        for export in self.host_dict[self.host]:
            exp_fd.write ("volume posix%d\n" % i)
            exp_fd.write ("    type storage/posix\n")
            exp_fd.write ("#   option o-direct enable # (default: disable) boolean type only\n")
            exp_fd.write ("#   option export-statfs-size no # (default: yes) boolean type only\n")
            exp_fd.write ("#   option mandate-attribute off # (default: on) boolean type only\n")
            exp_fd.write ("#   option span-devices 8 # (default: 0) integer value\n")
            exp_fd.write ("#   option background-unlink yes # (default: no) boolean type\n")

            exp_fd.write ("    option directory %s\n" % export)
            exp_fd.write ("end-volume\n\n")

            if self.nfs:
                exp_fd.write ("volume posix-ac%d\n" % i)
                exp_fd.write ("    type features/access-control\n")
                exp_fd.write ("    subvolumes posix%d\n" % i)
                exp_fd.write ("end-volume\n\n")

            if self.volume_size_server:
                exp_fd.write ("volume quota%d\n" % i)
                exp_fd.write ("    type features/quota\n")
                exp_fd.write ("    option disk-usage-limit %s\n" % self.volume_size_server)
                exp_fd.write ("#   option minimum-free-disk-limit 10GB"
                              "  # minimum free disk value (default) 0\n")
                exp_fd.write ("#   option refresh-interval 10\n")
                if self.nfs:
                    exp_fd.write ("    subvolumes posix-ac%d\n" % i)
                else:
                    exp_fd.write ("    subvolumes posix%d\n" % i)
                exp_fd.write ("end-volume\n\n")


            exp_fd.write ("volume locks%d\n" % i)
            exp_fd.write ("    type features/locks\n")
            exp_fd.write ("#   option mandatory on # Default off, used in specific applications\n")
            if self.volume_size_server:
                exp_fd.write ("    subvolumes quota%d\n" % i)
            else:
                exp_fd.write ("    subvolumes posix%d\n" % i)
            exp_fd.write ("end-volume\n\n")

            exp_fd.write ("volume %s\n" % export)
            exp_fd.write ("    type performance/io-threads\n")
            exp_fd.write ("    option thread-count 8\n")
            exp_fd.write ("#   option autoscaling yes # Heuristic for autoscaling threads on demand\n")
            exp_fd.write ("#   option min-threads 2 # min count for thread pool\n")
            exp_fd.write ("#   option max-threads 64 # max count for thread pool\n")

            exp_fd.write ("    subvolumes locks%d\n" % i)
            exp_fd.write ("end-volume\n\n")

            total_bricks.append("%s" % export)
            i += 1

        for transport in self.transports:
            exp_fd.write ("volume server-%s\n" % transport)
            exp_fd.write ("    type protocol/server\n")
            exp_fd.write ("    option transport-type %s\n" % transport)
            for brick in total_bricks:
                exp_fd.write ("    option auth.addr.%s.allow %s\n" %
                              (brick, self.auth_parameters))

            if transport == 'ib-verbs':
                exp_fd.write ("    option transport.ib-verbs.listen-port %d\n" % self.gfs_ib_port)
                exp_fd.write ("    option transport.ib-verbs.port %d\n" %
                              self.ib_devport)
            if transport == 'tcp':
                exp_fd.write ("    option transport.socket.listen-port %d\n" % self.gfs_port)
                exp_fd.write ("    option transport.socket.nodelay on\n")

            exp_fd.write ("    subvolumes %s\n" %
                          string.join(total_bricks, ' '))
            exp_fd.write ("end-volume\n\n")

        return