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Re: advice needed: snapshot DB/table cleanup


On Fri, Aug 17, 2018 at 11:23 AM, Andrija Panic <andrija.panic@xxxxxxxxx>

> HI guys, hi Mike.T.,
> we have removed all NFS and CEPH storages, and are now purely running on
> SolidFire (KVM).
> Now I want to do serious snapshot cleanup (for reason explained at the end
> of email) - since "snapshots" and "snapshot_store_ref" tables are a
> complete mess (i.e. snapshot is destroyed with/without "removed" date, and
> then there are still references in snapshot_store_ref to these fully/half
> destroyed snapshots...)
> I would like to ask for a tip - based on my common sense and experience, I
> was thinking on doing something like following:
> SQL:
> delete from snapshot_store_ref where snapshot_id in (select id from
> snapshots where status="destroyed" or removed is NOT NULL and min_iops is
why the do you want to keep the solidfire snapshots when removed?

> This last "min_iops is NULL" is identifier for snaps that are NOT on
> SolidFire - I would not touch SF snapshots) - i.e. all snapshots that are
> created from SF volumes have min_iops and max_iops values set - so I just
> exclude them here....
> - So - above I want to remove all references for snapshots that are
> fully/semi destroyed (status=destroyed but no removed date - or other way
> around - those that have "removed" date but status=Ready.....)
isn't this the same as below?

> Then I was also thinking does it make sense, to also set (in "snapshots"
> table) status=Destroyed where removed is NOT NULL and other way around -
> set removed date where status=Destroyed.
isn't this the same as above?

Also when having cleaned all snapshots that are not for solidfire I would
first do a check as your mess should be largely cleaned by then.
and if a few snapshots still jump out better investigate those to see if
you can find any root cause for the failure.

> Sorry for long question - but I had issues with some snaps referencing CEPH
> (and we removed CEPH/NFS from ACS GUI) - i.e. client was unable to list
> snaps for his account, because some volumes had snaps that were referencing
> CEPH (though they are migrated to SF or deleted)...
> Thanks a lot
hope my loose hipshots help,

> Andrija
> --
> Andrija Panić