From: Zdenek Kabelac <zkabelac@redhat.com>
To: LVM general discussion and development <linux-lvm@redhat.com>,
Dale Stephenson <dalestephenson@mac.com>
Subject: Re: [linux-lvm] Performance penalty for 4k requests on thin provisioned volume
Date: Thu, 14 Sep 2017 13:13:41 +0200 [thread overview]
Message-ID: <56cdaa13-a10a-a545-3cb6-cb454330df3f@redhat.com> (raw)
In-Reply-To: <c8762bcf-4db5-973e-e5d2-4683e4076351@assyoma.it>
Dne 14.9.2017 v 12:57 Gionatan Danti napsal(a):
> On 14/09/2017 11:37, Zdenek Kabelac wrote:
>> Sorry my typo here - is NOT ;)
>>
>>
>> Zdenek
>
> Hi Zdenek,
> as the only variable is the LVM volume type (fat/thick vs thin), why the thin
> volume is slower than the thick one?
>
> I mean: all other things being equal, what is holding back the thin volume?
So few more question:
What is '/dev/sdb4' ? - is it also some fast SSD ?
([thinpool_tmeta] volgr0 ewi-ao---- 16.00g 1 0 /dev/sdb4:0-4095
- just checking to be sure your metadata device is not placed on rotational
storage device)...
What is your thin-pool chunk size - is it 64K ?
- if your raise thin-pool chunk size up - is it getting any better ?
Regards
Zdenek
next prev parent reply other threads:[~2017-09-14 11:13 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-13 15:33 [linux-lvm] Performance penalty for 4k requests on thin provisioned volume Dale Stephenson
2017-09-13 20:19 ` Zdenek Kabelac
2017-09-13 22:39 ` Dale Stephenson
2017-09-14 9:00 ` Zdenek Kabelac
2017-09-14 9:37 ` Zdenek Kabelac
2017-09-14 10:52 ` Gionatan Danti
2017-09-14 10:57 ` Gionatan Danti
2017-09-14 11:13 ` Zdenek Kabelac [this message]
2017-09-14 14:32 ` Dale Stephenson
2017-09-14 15:25 ` Dale Stephenson
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