Date: Wed, 6 Apr 2022 16:43:49 -0400
From: mike tancsa <mike@sentex.net>
To: 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: <d8eec440-aff5-e2c7-35d5-04ac96939213@sentex.net>
In-Reply-To: <alpine.GSO.2.20.2204061513180.9475@scrappy.simplesystems.org>
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>
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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 will be stored more efficiently. > FYI, a couple of our big zfs mailspools sees a 1.24x and 1.23x compress ratio with lz4. We use Maildir format as well. They are not RELENG_13 so not sure how zstd would fair. ---Mike
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