diff options
| author | Dan Lambright <dlambrig@redhat.com> | 2015-09-18 00:49:06 -0400 |
|---|---|---|
| committer | Dan Lambright <dlambrig@redhat.com> | 2015-10-10 06:00:04 -0700 |
| commit | 672baab88fb7f32e844cd4be22e0924e4e0e83fc (patch) | |
| tree | 8a05387b3508cc8f15ec448ab2e7b2baac897413 /xlators/cluster/dht/src/tier.h | |
| parent | a4f982be9b21323038704069a56fb2448369d6a0 (diff) | |
cluster/tier: add watermarks and policy driver
This fix introduces infrastructure to support different
policies for promotion and demotion.
Currently the tier feature automatically promotes and demotes
files periodically based on access. This is good for testing
but too stringent for most real workloads. It makes it
difficult to fully utilize a hot tier- data will be demoted
before it is touched- its unlikely a 100GB hot SSD will have
all its data touched in a window of time.
A new parameter "mode" allows the user to pick promotion/demotion
polcies.
The "test mode" will be used for *.t and other general testing.
This is the current mechanism.
The "cache mode" introduces watermarks. The watermarks
represent levels of data residing on the hot tier.
"cache mode" policy:
The % the hot tier is full is called P.
Do not promote or demote more than D MB or F files.
A random number [0-100] is called R.
Rules for migration:
if (P < watermark_low) don't demote, always promote.
if (P >= watermark_low) && (P < watermark_hi) demote if R < P; promote if R > P.
if (P > watermark_hi) always demote, don't promote.
gluster volume set {vol} cluster.watermark-hi %
gluster volume set {vol} cluster.watermark-low %
gluster volume set {vol} cluster.tier-max-mb {D}
gluster volume set {vol} cluster.tier-max-files {F}
gluster volume set {vol} cluster.tier-mode {test|cache}
Change-Id: I157f19667ec95aa1d53406041c1e3b073be127c2
BUG: 1257911
Signed-off-by: Dan Lambright <dlambrig@redhat.com>
Reviewed-on: http://review.gluster.org/12039
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
Diffstat (limited to 'xlators/cluster/dht/src/tier.h')
| -rw-r--r-- | xlators/cluster/dht/src/tier.h | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/xlators/cluster/dht/src/tier.h b/xlators/cluster/dht/src/tier.h index d168221fe1d..18ca3269f8b 100644 --- a/xlators/cluster/dht/src/tier.h +++ b/xlators/cluster/dht/src/tier.h @@ -20,10 +20,6 @@ #include <fnmatch.h> #include <signal.h> -#define DEFAULT_PROMOTE_FREQ_SEC 120 -#define DEFAULT_DEMOTE_FREQ_SEC 120 -#define DEFAULT_WRITE_FREQ_SEC 0 -#define DEFAULT_READ_FREQ_SEC 0 /* * Size of timer wheel. We would not promote or demote less * frequently than this number. @@ -60,7 +56,7 @@ typedef struct brick_list { xlator_t *xlator; char *brick_db_path; struct list_head list; -} brick_list_t; +} tier_brick_list_t; typedef struct _dm_thread_args { xlator_t *this; @@ -70,4 +66,22 @@ typedef struct _dm_thread_args { int return_value; } promotion_args_t, demotion_args_t; +typedef enum tier_watermark_op_ { + TIER_WM_NONE = 0, + TIER_WM_LOW, + TIER_WM_HI, + TIER_WM_MID +} tier_watermark_op_t; + +#define DEFAULT_PROMOTE_FREQ_SEC 120 +#define DEFAULT_DEMOTE_FREQ_SEC 120 +#define DEFAULT_DEMOTE_DEGRADED 10 +#define DEFAULT_WRITE_FREQ_SEC 0 +#define DEFAULT_READ_FREQ_SEC 0 +#define DEFAULT_WM_LOW 75 +#define DEFAULT_WM_HI 90 +#define DEFAULT_TIER_MODE TIER_MODE_TEST +#define DEFAULT_TIER_MAX_MIGRATE_MB 1000 +#define DEFAULT_TIER_MAX_MIGRATE_FILES 5000 + #endif |