Date: Wed, 08 Jan 2014 16:00:07 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: Steven Hartland <killing@multiplay.co.uk> Cc: Karl Pielorz <kpielorz_lst@tdx.co.uk>, freebsd-geom@FreeBSD.org Subject: Re: Is TRIM working with gmirror? Message-ID: <52CD67F7.2060608@quip.cz> In-Reply-To: <C38DE9655CBB41029AF5CF0583CD2ACC@multiplay.co.uk> References: <52A90049.7050001@quip.cz> <18C59233568D3A475FF0D843@study64.tdx.co.uk> <52CB2915.7060602@quip.cz> <7FBCC53840FA45928B9F527EA235B632@multiplay.co.uk> <52CB4C9E.3020904@quip.cz> <41F7CA403B574953B72B6CF4D1DDE71D@multiplay.co.uk> <52CBEE9E.2090800@quip.cz> <353E7C512D234EDE84863C872D7856DE@multiplay.co.uk> <C38DE9655CBB41029AF5CF0583CD2ACC@multiplay.co.uk>
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Steven Hartland wrote: > ----- Original Message ----- From: "Steven Hartland" > <killing@multiplay.co.uk> > >> ----- Original Message ----- From: "Miroslav Lachman" <000.fbsd@quip.cz> >> >>> Steven Hartland wrote: >>> [...] >>>> Unless you have a specific reason for using gmirror I would strongly >>>> advise trying ZFS instead, it will definitely support TRIM in that >>>> config and comes with a host of other benefits too :) >>> >>> The specific reason is performance and memory consumption. We need >>> every piece of performance and all memory to MySQL daemon, so this is >>> why gmirror was choosen. >>> We have ZFS on other purposes machines for years (from 7.x days), so >>> I can say "I have a lot of experiences" (good and bad too). >>> In some tests, ZFS is about 50% slower than UFS. >>> >>> What about graid(8) mirror instead of gmirror(8)? Is there better >>> support for TRIM on UFS? >> >> Actually looking at it gmirror should support delete no problem see >> g_mirror_init_disk GEOM::candelete. >> >> So you might want to add some debugging around there to see whats >> happening. > > Double checked this on HEAD and it definitely works as expected. I am not able to understand C sources, so I cannot check it myself. But if it is supported, why I see the warning message at boot? Miroslav Lachman
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