Date: Wed, 3 Feb 2010 21:40:33 +0900 From: =?UTF-8?B?VG9tbWkgTMOkdHRp?= <sty@iki.fi> To: Attila Nagy <bra@fsn.hu> Cc: freebsd-fs@freebsd.org Subject: Re: Machine stops for some seconds with ZFS Message-ID: <f43ef3191002030440j4fa9738fsf360f84771ebb986@mail.gmail.com> In-Reply-To: <4B696CB7.7070607@fsn.hu> References: <4B694689.2030704@fsn.hu> <f43ef3191002030409t16fe0056m9d6c83041d8051@mail.gmail.com> <4B696CB7.7070607@fsn.hu>
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> I'm not sure about these are being the same. When I see these "stops", > nothing happens. gstat shows no IO, and everything goes very quiet for some > painful (10s of) seconds. Also, buildworld doesn't do too heavy IO, at least > for these drives. Well that's what I experienced. iostat says 0, machine is kind of responsive, unless you try to read or write from the zfs pool.. > BTW, we are doing tests in a completely different environment with ZFS and > NFS (15k drives, with BBWC), and it seems something similar happens there > too, resulting in a freeze in the end. >> >> Combine with 5400 rpm consumer drives... well... >> > > Doesn't really count, but these drives are 7k2. If it's a zfs arc problem it would definitely manifest on 15k drives too, what I meant that the impact might be unnoticeable. But since I don't have a nice SAN to test with right now I can't try it out with 100+ disks. -- br, Tommi
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