-------- Original-Nachricht -------- Betreff: Re: devices get kicked from RAID about once a month Datum: Wed, 02 Jun 2010 19:08:58 +0200 Von: Stefan /*St0fF*/ Hübner <st0ff@xxxxxxx> Antwort an: st0ff@xxxxxx An: Dan Christensen <jdc@xxxxxx> Am 02.06.2010 18:33, schrieb Dan Christensen: > John Robinson <john.robinson@xxxxxxxxxxxxxxxx> writes: > >> My Samsung Spinpoint F1's can have TLER enabled using a more recent >> smartctl. It's not appeared as part of a formal release yet but a >> patch went in to r3065 in SVN: >> http://sourceforge.net/apps/trac/smartmontools/log/trunk/smartmontools > > Thanks. I got the svn3077 from Debian testing, but it doesn't seem to > be supported with my drives: > > # smartctl -l scterc /dev/sda > smartctl 5.40 2010-03-16 r3077 [i686-pc-linux-gnu] (local build) > Copyright (C) 2002-10 by Bruce Allen, > http://smartmontools.sourceforge.net > > Warning: device does not support SCT Commands There you have it: the drives are not supporting SCT-ERC. Which I can say is true: I also own an SP2504C. > > Any other suggestions? Not really, it's up to Neil to export some sysfs-variable, where you could tune how long a drive may take to respond to some command. The "trying hard to get the data back" can take up to a few minutes (somewhere I read about 2, somewhere else about 3 minutes). And what really is happening is: after some timeout the mdraid "thinks correctly", that the drive cannot provide the requested sector. To prevent failure, it reconstructs the "missing" data and issues a write request. Unfortunately the drive still tries to reconstruct the data itself and will not respond. After those write requests failing, mdraid drops the disk. The ERC-setting is volatile. You'd have to issue it on every reboot, and on every hotswap. But at first you'd have to get drives that support this setting. stefan > > Dan > > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
