Date: Fri, 18 Dec 2009 14:48:45 +0300 From: "Alexander Zagrebin" <alexz@visp.ru> To: "'Andriy Gapon'" <avg@icyb.net.ua> Cc: freebsd-current@freebsd.org Subject: RE: 8.0-RELEASE: disk IO temporarily hangs up (ZFS or ATA related problem) Message-ID: <4F5E9203FBE0440780E31C376646F5B0@vosz.local> In-Reply-To: <4B2B67FB.80705@icyb.net.ua> References: <39309F560B98453EBB9AEA0F29D9D80E@vosz.local><4C1C2598-4157-4B04-8DB8-C84F353AB8B8@nevada.net.nz><6FAA390A-1E40-4D7A-AAD5-DC72578CE974@nevada.net.nz> <200912182027.11632.doconnor@gsoft.com.au><5C4BD0F81D1348B287B2ECD55EF283E1@vosz.local> <4B2B67FB.80705@icyb.net.ua>
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> >> I doubt this is the problem, I have WD10EADS disks in my ZFS > >> array and I > >> see the same issue. > >> > >> It strikes me as extremely unlikely that both of us would have dud > >> disks.. > >> > >> In any case it seems to be a general problem not limited to > >> one area of > >> the disk so a dud sector is an unlikely reason. > > > > Big thanks for confirmation! > > Your confirmation is important for me. > > There should be a way to define where the bug is: in the > ata (or filesystem) > > driver or in the drive's firmware.... > > Just another 'me too'. > >From the moment I started using zfs and till this day I saw > this pattern when > writing lots data to zfs - first high throughput and then > idle pause, and so on. May be it usual write caching? See gstat or iostat output. At my case gstat shows abnormal value of %busy (usually approx. 180%) and very long ms/r and ms/w. -- Alexander Zagrebin
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