Date: Sat, 20 Aug 2011 11:34:56 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Alex Samorukov <ml@os2.kiev.ua> Cc: freebsd-stable@freebsd.org, Dan Langille <dan@langille.org> Subject: Re: bad sector in gmirror HDD Message-ID: <20110820183456.GA38317@icarus.home.lan> In-Reply-To: <4E4FF4D6.1090305@os2.kiev.ua> 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> <4E4FF4D6.1090305@os2.kiev.ua>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sat, Aug 20, 2011 at 07:54:30PM +0200, Alex Samorukov wrote: > 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. This is inaccurate advice. I covered this in my reply already as well: http://lists.freebsd.org/pipermail/freebsd-stable/2011-August/063665.html Quote: "The SMART tests you did didn't really amount to anything; no surprise. short and long tests usually do not test the surface of the disk. There are some drives which do it on a long test, but as I said before, everything varies from drive to drive." TL;DR version: smartctl -t long != smartctl -t select. The OP's drive does not support selective scans (-t select), and long turned up nothing (no surprise there either). So, using dd to find the bad LBAs is the only choice he has. > 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. You have to know what you're looking at and how to interpret the data smartd gives you for it to be useful. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, US | | Making life hard for others since 1977. PGP 4BD6C0CB |
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20110820183456.GA38317>