Date: Fri, 9 Apr 2010 15:15:17 +0400 From: Alexey Tarasov <me@lexasoft.ru> To: freebsd-fs@freebsd.org Subject: Re: ZFS raidz and 4k sector disks Message-ID: <96786FB1-DD39-4E22-B942-B87C15E164B0@lexasoft.ru> In-Reply-To: <4BBEE533.2050507@icyb.net.ua> 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>
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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 =D0=9F=D1=80=D0=B5=D0=B2=D0=B5=D0=B4 =D0=A3=D0=BA=D1=80=D0=B0=D0=B8=D0=BD=D0= =B5! =3D) On 09.04.2010, at 12:28, Andriy Gapon wrote: > on 08/04/2010 16:55 Alexey Tarasov said the following: >> Hello. >>=20 >> I've tried all methods and realized that unfortunately the only = working >> method is gnop. So you can't use these disks for ZFS at all now. >=20 > Why? And what are you actually trying to do? > My understanding was that even with 512-byte sectors ZFS still aligns = its > on-disk data with > 4K alignment. > Do you see otherwise? What problem do you have? >=20 > --=20 > Andriy Gapon -- Alexey Tarasov (\__/)=20 (=3D'.'=3D)=20 E[: | | | | :]=D0=97=20 (")_(")
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