Date: Fri, 09 Apr 2010 15:14:38 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: Alexey Tarasov <me@lexasoft.ru> Cc: freebsd-current@freebsd.org Subject: Re: ZFS raidz and 4k sector disks Message-ID: <4BBF1A2E.1070102@icyb.net.ua> In-Reply-To: <90829696-180F-49E1-B37A-5144DE9E30D6@lexasoft.ru> References: <201003291616.27838.Pascal.Stumpf@cubes.de> <9D752CC7-5CCA-454D-8BEC-F3D5E6F8445C@lexasoft.ru> <hoqgc8$ee9$1@dough.gmane.org> <46D5776E-39F0-48A7-B1C0-B844BF5147C5@lexasoft.ru> <4BBEE533.2050507@icyb.net.ua> <90829696-180F-49E1-B37A-5144DE9E30D6@lexasoft.ru>
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on 09/04/2010 14:14 Alexey Tarasov said the following: > Hello. > > I see considerably increased performance when creating over gnop -S 4096 virtual disk. Even when I create zpool over raw disks the performance is very bad and concurent writes stalls. When using gnop, zfs works VERY fast! > > Btw, here is another discussion, may be there is a bug in a mav@ commit, because he has added support for >512 sector size: > http://lists.freebsd.org/pipermail/freebsd-current/2010-April/016495.html Looks like I was wrong: /* * Determine the device's minimum transfer size. */ *ashift = highbit(MAX(pp->sectorsize, SPA_MINBLOCKSIZE)) - 1; This is in vdev_geom_open and SPA_MINBLOCKSIZE is 512. -- Andriy Gapon
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