Date: Fri, 29 Oct 2010 13:43:00 +0400 From: S.N.Grigoriev <serguey-grigoriev@yandex.ru> To: jhell <jhell@dataix.net> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS write speed Message-ID: <257661288345380@web73.yandex.ru> In-Reply-To: <4CCA3C11.4000609@DataIX.net> References: <398231288212690@web127.yandex.ru> <7FF9CDFF-3FA0-45EA-85F5-A236AEFC03C7@lassitu.de> <313981288251001@web49.yandex.ru> <4CCA3C11.4000609@DataIX.net>
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29.10.10, 07:14, "jhell" <jhell@DataIX.net>: > On 10/28/2010 03:30, S.N.Grigoriev wrote: > > > > > > 28.10.10, 01:54, "Stefan Bethke" : > > > >> Am 27.10.2010 um 22:51 schrieb S.N.Grigoriev: > >> > >> > Hi list, > >> > > >> > I've got very low write speed using ZFS on a SATA disk. > >> > My HDD configuration is: > >> > ad4: 70911MB at ata2-master UDMA100 SATA 3Gb/s > >> > ad6: 78532MB at ata3-master UDMA100 SATA 1.5Gb/s > >> > ad8: 1430799MB at ata4-master UDMA100 SATA 3Gb/s > >> > >> The EARS has 4k sectors, if I'm not mistaken. I don't recall the eventual > >> outcome, but there was a long thread on stable or hackers on how to ensure > >> proper alignment and (minimun) 4k-sized writes to make sure the disk doesn't > >> have to do a read-modify-write cycle, so try and search the archives. > > Though this might play a small part in your write performance with the > EARS drives, this issue has more to do with the stat() calls and the ACL > involvement with ZFS. This was sort of solved in 8.1-STABLE and from 3 > cases that I know about and 1 being my own... write/read speeds have > doubled from what can be seen to an effect of 8.1-RELEASE. > > You may want to either upgrade to stable/8 or use one of the snapshots > from here: > > ftp://ftp.freebsd.org/pub/FreeBSD/snapshots/201010/ > thank you. I'll be experimenting with STABLE next week. -- Regards, S.Grigoriev.
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