Date: Thu, 28 Oct 2010 11:30:01 +0400 From: S.N.Grigoriev <serguey-grigoriev@yandex.ru> To: Stefan Bethke <stb@lassitu.de> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS write speed Message-ID: <313981288251001@web49.yandex.ru> In-Reply-To: <7FF9CDFF-3FA0-45EA-85F5-A236AEFC03C7@lassitu.de> References: <398231288212690@web127.yandex.ru> <7FF9CDFF-3FA0-45EA-85F5-A236AEFC03C7@lassitu.de>
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28.10.10, 01:54, "Stefan Bethke" <stb@lassitu.de>: > 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. Stefan, thank you for your response. I'll try to find the topic you pointed. > > ad4 and ad6 are single-slice disks (UFS2 with soft updates) > > > > ZFS configuration is following: > > zpool create Z ad8 > > zfs create Z/music > > zfs create Z/video > > All ZFS parameters are default. > > kern.maxvnodes = 1000000 > > > > To test my configuration I recursively copied from ad6 to ad8 two directories. > > The first one contains MP3 files (average size = 10MB). > > The second one contains AVI files (average size = 1GB). > > > > To compare performance I repeated above tests with ad8 using UFS2 with soft updates. > > > > 18GB of MP3 files required 10m35s to copy to UFS2 and 21m40s to copy to ZFS. > > 30GB of AVI files required 16m6s to copy to UFS2 and 1h2m39s to copy to ZFS. > > > > I used for tests FreeBSD 8.1R amd64. Amount of RAM on my machine is 6GB. > > > > Any tips? > > > > -- -- Regards, Serguey.
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