On Thu, Jul 7, 2016 at 1:07 AM, 秀才 <hualingson@xxxxxxxxxxx> wrote:
> Hi,All:)
>
> i have made a cache-tier,
> but i do not know message 'removed_snaps
> [1~1,3~6,b~6,13~c,21~4,26~1,28~1a,4e~4,53~5,5c~5,63~1,65~4,6b~4]'.
> i have not snapped any thing yet.
When you take snapshots, it generally creates a lot of tracking data
throughout the cluster that needs to get deleted.
When you remove a snapshot, that is propagated by the OSDMap via removed_snaps.
removed_snaps is an "interval set", not a simple list/array/vector (to
keep the size down), consisting of an offset and the number of deleted
IDs following.
A cache tier's removed_snaps has to match that of its backing pool,
for a whole bunch of consistency reasons. And you'll note that here it
does. ;)
-Greg
>
>
> ceph> osd pool ls detail
> pool 0 'rbd' replicated size 3 min_size 1 crush_ruleset 0 object_hash
> rjenkins pg_num 64 pgp_num 64 last_change 1 flags hashpspool stripe_width 0
> pool 1 'volumes' replicated size 3 min_size 1 crush_ruleset 0 object_hash
> rjenkins pg_num 512 pgp_num 512 last_change 11365 lfor 11365 flags
> hashpspool tiers 3 read_tier 3 write_tier 3 stripe_width 0
> removed_snaps
> [1~1,3~6,b~6,13~c,21~4,26~1,28~1a,4e~4,53~5,5c~5,63~1,65~4,6b~4]
> pool 2 'test' replicated size 3 min_size 1 crush_ruleset 0 object_hash
> rjenkins pg_num 100 pgp_num 100 last_change 2779 flags hashpspool
> stripe_width 0
> pool 3 'fast' replicated size 2 min_size 1 crush_ruleset 1 object_hash
> rjenkins pg_num 128 pgp_num 128 last_change 11376 flags
> hashpspool,incomplete_clones tier_of 1 cache_mode writeback target_bytes
> 150000000000 hit_set bloom{false_positive_probability: 0.05, target_size: 0,
> seed: 0} 3600s x1 min_read_recency_for_promote 1 stripe_width 0
> removed_snaps
> [1~1,3~6,b~6,13~c,21~4,26~1,28~1a,4e~4,53~5,5c~5,63~1,65~4,6b~4]
>
> Regards,
> XiuCai.
>
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