Hi,
Seems like the sparsify and manual fstrim is doing what it needs to do.
When sparsify the image, if image has snapshots let say 3 snapshots, need to wait until it
rotates all of them (remove and create with new set instead).
I think it reclaims some of it too but I guess it up to free space on that
filesystem/volume.
Those two commands together really reclaims back after snapshot is rotated.
This article is interesting
https://www.ibm.com/docs/en/storage-fusion/2.6?topic=resources-reclaiming-s…
does both sparsify/fstrim to achieve reclaim.
Istvan Szabo
Staff Infrastructure Engineer
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Agoda Services Co., Ltd.
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________________________________
From: Ilya Dryomov <idryomov(a)gmail.com>
Sent: Monday, December 4, 2023 6:10 PM
To: Szabo, Istvan (Agoda) <Istvan.Szabo(a)agoda.com>
Cc: Ceph Users <ceph-users(a)ceph.io>
Subject: Re: [ceph-users] Space reclaim doesn't happening in nautilus RBD pool
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Hi Istvan,
The number of objects in "im" pool (918.34k) doesn't line up with
"rbd du" output which says that only 2.2T are provisioned (that would
take roughly ~576k objects). This usually occurs when there are object
clones caused by previous snapshots -- keep in mind that trimming
object clones after a snapshot is removed is an asynchronous process
and it can take a while.
Just to confirm, what is the output of "rbd info im/root",
"rbd snap ls --all im/root", "ceph df" (please recapture) and
"ceph osd pool ls detail" (only "im" pool is of interest)?
Thanks,
Ilya
On Fri, Dec 1, 2023 at 5:31 AM Szabo, Istvan (Agoda)
<Istvan.Szabo(a)agoda.com> wrote:
Thrash empty.
Istvan Szabo
Staff Infrastructure Engineer
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Agoda Services Co., Ltd.
e: istvan.szabo(a)agoda.com
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________________________________
From: Ilya Dryomov <idryomov(a)gmail.com>
Sent: Thursday, November 30, 2023 6:27 PM
To: Szabo, Istvan (Agoda) <Istvan.Szabo(a)agoda.com>
Cc: Ceph Users <ceph-users(a)ceph.io>
Subject: Re: [ceph-users] Space reclaim doesn't happening in nautilus RBD pool
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attachment !
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On Thu, Nov 30, 2023 at 8:25 AM Szabo, Istvan (Agoda)
<Istvan.Szabo(a)agoda.com> wrote:
Hi,
Is there any config on Ceph that block/not perform space reclaim?
I test on one pool which has only one image 1.8 TiB in used.
rbd $p du im/root
warning: fast-diff map is not enabled for root. operation may be slow.
NAME PROVISIONED USED
root 2.2 TiB 1.8 TiB
I already removed all snaphots and now pool has only one image alone.
I run both fstrim over the filesystem (XFS) and try rbd sparsify im/root (don't
know what it is exactly but it mentions to reclaim something)
It still shows the pool used 6.9 TiB which totally not make sense right? It should be up
to 3.6 (1.8 * 2) according to its replica?
Hi Istvan,
Have you checked RBD trash?
$ rbd trash ls -p im
Thanks,
Ilya
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