Date: Wed, 27 Oct 2010 23:54:33 +0200 From: Stefan Bethke <stb@lassitu.de> To: S.N.Grigoriev <serguey-grigoriev@yandex.ru> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS write speed Message-ID: <7FF9CDFF-3FA0-45EA-85F5-A236AEFC03C7@lassitu.de> In-Reply-To: <398231288212690@web127.yandex.ru> References: <398231288212690@web127.yandex.ru>
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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 <WDC WD740BLFS-01YBU0 04.04V01> at ata2-master UDMA100 SATA 3Gb/s > ad6: 78532MB <Hitachi HDS728080PLA380 PF2OA60A> at ata3-master UDMA100 SATA 1.5Gb/s > ad8: 1430799MB <WDC WD15EARS-00MVWB0 51.0AB51> 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. > 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. > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" -- Stefan Bethke <stb@lassitu.de> Fon +49 151 14070811
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