Date: Wed, 16 Nov 2011 11:23:53 -0000 From: "Pegasus Mc Cleaft" <ken@mthelicon.com> To: "'Andrea Venturoli'" <ml@netfence.it>, <freebsd-questions@freebsd.org> Subject: RE: ATA trouble again Message-ID: <005601cca452$3a21f800$ae65e800$@com> In-Reply-To: <4EC38D1C.30205@netfence.it> References: <4EC38D1C.30205@netfence.it>
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>Hello. > >This is a follow-up of a previous thread, which can be found here: > >> = http://lists.freebsd.org/pipermail/freebsd-questions/2011-July/232257. >> html > > > >I finally have two working WD Green drives: they have run severel times >for more than a few days continuosly and I've run their full diags >a few times over a span of some weeks, so I think I can be sure of = that. >Still I experience lot of troubles; however, trying different boxes,=20 >I found out that these depend heavily on the controller I use. Hi Andrea,=20 I don=E2=80=99t know if this will help you or not, but it may lead you = to another possibility.=20 I had a similar problem on my box (I was running 9.0-Current and=20 Now 10.0-Current). I was also running under ZFS and would get TONS of=20 Errors across my SATA drives. The errors would be anything from = time-outs to physical locking of the drive (I would have to pull the drive to let the PHY on the controller reset and then plug the drive back in before it would communicate with the machine again). In particular this would happen when I was doing large writes to the drives. Read performance=20 also suffered. I then created a single drive pool and did a large transfer to the drive (about 800Gb) and the controller timed out again. I moved the drive to various ports on the machine and also various controllers in the machine. Some seemed to exabate the problem quicker but no port or drive was safe from this.=20 I later found out that the drives I was using were using 4096 Bytes per sector. When I recreated the zpool using 4096 byte sectors All the timeout errors disappeared and my data-rate has climbed Dramatically.=20 Are you using ZFS or do you know if the drives are using 4096 bytes Per sector? Ta Peg
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