Date: Wed, 6 Apr 2022 23:59:50 +0200
From: Stefan Esser <se@FreeBSD.org>
To: mike tancsa <mike@sentex.net>, Bob Friesenhahn <bfriesen@simple.dallas.tx.us>, egoitz@ramattack.net
Cc: freebsd-fs@FreeBSD.org, freebsd-hackers@FreeBSD.org, Freebsd performance <freebsd-performance@FreeBSD.org>
Subject: Re: {* 05.00 *}Re: Desperate with 870 QVO and ZFS
Message-ID: <0702dc56-28ba-7e99-d599-1036634d79e3@FreeBSD.org>
In-Reply-To: <d8eec440-aff5-e2c7-35d5-04ac96939213@sentex.net>
References: <4e98275152e23141eae40dbe7ba5571f@ramattack.net> <665236B1-8F61-4B0E-BD9B-7B501B8BD617@ultra-secure.de> <0ef282aee34b441f1991334e2edbcaec@ramattack.net> <28e11d7ec0ac5dbea45f9f271fc28f06@ramattack.net> <ca3f86f2-94a1-be94-ad55-7bd1c9bc50ab@grosbein.net> <7aa95cb4bf1fd38b3fce93bc26826042@ramattack.net> <alpine.GSO.2.20.2204061513180.9475@scrappy.simplesystems.org> <d8eec440-aff5-e2c7-35d5-04ac96939213@sentex.net>
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From: Stefan Esser <se@FreeBSD.org>
To: mike tancsa <mike@sentex.net>,
Bob Friesenhahn <bfriesen@simple.dallas.tx.us>, egoitz@ramattack.net
Cc: freebsd-fs@FreeBSD.org, freebsd-hackers@FreeBSD.org,
Freebsd performance <freebsd-performance@FreeBSD.org>
Message-ID: <0702dc56-28ba-7e99-d599-1036634d79e3@FreeBSD.org>
Subject: Re: {* 05.00 *}Re: Desperate with 870 QVO and ZFS
References: <4e98275152e23141eae40dbe7ba5571f@ramattack.net>
<665236B1-8F61-4B0E-BD9B-7B501B8BD617@ultra-secure.de>
<0ef282aee34b441f1991334e2edbcaec@ramattack.net>
<28e11d7ec0ac5dbea45f9f271fc28f06@ramattack.net>
<ca3f86f2-94a1-be94-ad55-7bd1c9bc50ab@grosbein.net>
<7aa95cb4bf1fd38b3fce93bc26826042@ramattack.net>
<alpine.GSO.2.20.2204061513180.9475@scrappy.simplesystems.org>
<d8eec440-aff5-e2c7-35d5-04ac96939213@sentex.net>
In-Reply-To: <d8eec440-aff5-e2c7-35d5-04ac96939213@sentex.net>
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Am 06.04.22 um 22:43 schrieb mike tancsa:
> On 4/6/2022 4:18 PM, Bob Friesenhahn wrote:
>> On Wed, 6 Apr 2022, egoitz@ramattack.net wrote:
>>>>
>>>> WE DON'T USE COMPRESSION AS IT'S NOT SET BY DEFAULT. SOME PEOPLE SAY=
YOU
>>>> SHOULD HAVE IT ENABLED.... BUT.... JUST FOR AVOID HAVING SOME DATA
>>>> COMPRESSED SOME OTHER NOT (IN CASE YOU ENABLE AND LATER DISABLE) AND=
>>>> FINALLY FOR AVOID ACCESSING TO INFORMATION WITH DIFFERENT CPU COSTS =
OF
>>>> HANDLING... WE HAVE NOT TOUCHED COMPRESSION....
>>
>> There seems to be a problem with your caps-lock key.
>>
>> Since it seems that you said that you are using maildir for your mail =
server,
>> it is likely very useful if you do enable even rather mild compression=
(e.g.
>> lz4) since this will reduce the write work-load and even short files w=
ill be
>> stored more efficiently.
>>
> FYI, a couple of our big zfs=C2=A0 mailspools sees a 1.24x and 1.23x co=
mpress ratio
> with lz4.=C2=A0 We use Maildir format as well.=C2=A0 They are not RELEN=
G_13 so not sure
> how zstd would fair.
I have got much better compression at same or less load by use of zstd-2
compared to lz4.
Perhaps not typical, since this is a dovecot mdbox formatted mail pool
holding mostly plain text messages without large attachments:
$ df /var/mdbox
Filesystem 1K-blocks Used Avail Capacity Mounted on
system/var/mdbox 7234048944 9170888 7224878056 0% /var/mdbox
$ zfs get compression,compressratio,used,logicalused system/var/mdbox
NAME PROPERTY VALUE SOURCE
system/var/mdbox compression zstd-2 inherited from system/va=
r
system/var/mdbox compressratio 2.29x -
system/var/mdbox used 8.76G -
system/var/mdbox logicalused 20.0G -
Regards, STefan
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