From: Gionatan Danti <g.danti@assyoma.it>
To: Zhiyong Ye <yezhiyong@bytedance.com>
Cc: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] Why is the performance of my lvmthin snapshot so poor
Date: Tue, 14 Jun 2022 14:56:30 +0200 [thread overview]
Message-ID: <daaa5fa473c1ce56f9d9d4e149047fe6@assyoma.it> (raw)
In-Reply-To: <8baee796-9bfb-47a8-1661-7e94437826c9@bytedance.com>
Il 2022-06-14 12:16 Zhiyong Ye ha scritto:
> After creating the PV and VG based on the iSCSI device, I created the
> thin pool as follows:
> lvcreate -n pool -L 1000G test-vg
> lvcreate -n poolmeta -L 100G test-vg
> lvconvert --type thin-pool --chunksize 64k --poolmetadata
> test-vg/poolmeta test-vg/pool
> lvchange -Z n test-vg/pool
I did my performance test with bigger chunk size, in the range of
128-512K. It can very well be that the overload of a smaller chunk size
results in 10x lower IOPs for to-be-allocated-and-copied chunks. Can you
retry fio after increasing chunk size?
As a side not, if I remember correcly thin pool metadata is hard limited
do 16 GB - no need to allocate 100 GB for it.
--
Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: g.danti@assyoma.it - info@assyoma.it
GPG public key ID: FF5F32A8
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next prev parent reply other threads:[~2022-06-14 12:56 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-13 8:49 [linux-lvm] Why is the performance of my lvmthin snapshot so poor Zhiyong Ye
2022-06-14 7:04 ` Gionatan Danti
2022-06-14 10:16 ` Zhiyong Ye
2022-06-14 12:56 ` Gionatan Danti [this message]
2022-06-14 13:29 ` Zhiyong Ye
2022-06-14 14:54 ` Gionatan Danti
2022-06-15 7:42 ` Zhiyong Ye
2022-06-15 9:34 ` Gionatan Danti
2022-06-15 9:46 ` Zhiyong Ye
2022-06-15 12:40 ` Gionatan Danti
2022-06-15 16:39 ` Demi Marie Obenour
2022-06-16 7:53 ` Demi Marie Obenour
2022-06-16 13:22 ` Gionatan Danti
2022-06-16 16:19 ` Demi Marie Obenour
2022-06-16 19:50 ` Gionatan Danti
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