Date: Sat, 20 Aug 2011 19:54:30 +0200 From: Alex Samorukov <ml@os2.kiev.ua> To: Dan Langille <dan@langille.org> Cc: freebsd-stable@freebsd.org, Jeremy Chadwick <freebsd@jdc.parodius.com> Subject: Re: bad sector in gmirror HDD Message-ID: <4E4FF4D6.1090305@os2.kiev.ua> In-Reply-To: <4774BC00-F32B-4BF4-A955-3728F885CAA1@langille.org> References: <1B4FC0D8-60E6-49DA-BC52-688052C4DA51@langille.org> <20110819232125.GA4965@icarus.home.lan> <B6B0AD0F-A74C-4F2C-88B0-101443D7831A@langille.org> <20110820032438.GA21925@icarus.home.lan> <4774BC00-F32B-4BF4-A955-3728F885CAA1@langille.org>
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You can run long self-test in smartmontools (-t long). Then you can get failed sector number from the smartmontools (-l selftest) and then you can use DD to write zero to the specific sector. Also i am highly recommending to setup smartd as daemon and to monitor number of relocated sectors. If they will grow again - then it is a good time to utilize this disk. > [root@bast:~] # dd of=/dev/null if=/dev/ad2 bs=1m conv=noerror > dd: /dev/ad2: Input/output error > 2717+0 records in > 2717+0 records out > 2848980992 bytes transferred in 127.128503 secs (22410246 bytes/sec) > dd: /dev/ad2: Input/output error > 38170+1 records in > 38170+1 records out > 40025063424 bytes transferred in 1544.671423 secs (25911701 bytes/sec) > [root@bast:~] # > > That seems to indicate two problems. Are those the values I should be using > with dd? >
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