Date: Fri, 19 Dec 97 19:29:00 -0000 From: mikebw@bilow.bilow.uu.ids.net (Mike Bilow) To: aic7xxx@freebsd.org Subject: sd0: MEDIUM ERROR Message-ID: <49ac4c04@bilow.bilow.uu.ids.net>
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Penisoara Adrian wrote in a message to Mike Bilow: PA> I've recently ran again into an older problem; from time to PA> time (like 4-5 months) I get a weird error message like this: PA> -- excerpt from /var/log/messages -- PA> Dec 18 22:57:01 ady /kernel: sd0: MEDIUM ERROR info:0x36e823 PA> csi:a,f2,2,62 asc:11,0 Unrecovered read error sks:80,70 PA> Dec 18 22:57:04 ady /kernel: , retries:4 PA> ------------------------------------ In my experience, the kernel means what it says when you get MEDIUM ERROR. PA> Sould I assume that my current harddisk (Quantum VP32170S PA> 'plugged into' a AHA2940AU) is good just to hold (at most) the PA> squid-swap from now on ? I sincerely wouldn't trust in him PA> now... I'm not sure what a "squid-swap" is, but I assume it's an odd translation from Romanian? In any case, I had a bunch of problems along the lines you are having, although slightly more frequently. I found that many hard drive manufacturers set their internal mode pages to default to having automatic reallocation on write disabled. I can't think of any legitimate reason for doing that, since AWRE is one of the major features of SCSI. In the case of the old Seagate I had this problem with, I first ran the Ext2 filesystem check utility with the option of test reading all sectors. This truncated a couple of files, but at least I knew which ones they were and was guaranteed that the filesystem was in a well-defined and stable state. Then I ran the "verify media" option built into the Adaptec ROM BIOS, which remapped 9 areas into the drive's "grown defect" table. Finally, under Linux, I used the Scsiinfo utility to manually enable AWRE in the appropriate mode page, and then also to write that information in the drive's NVRAM. That drive has been fine ever since. You can also periodically use Scsiinfo to check and see if any areas have been added to the grown defect list. PA> Could this be related with some sudden reboots I experienced PA> lately (no, my UPS didn't scream about power problems) ? Sure. If the drive was writing when some sort of mysterious power event occurred, it could blow up a sector or two. To some extent, this is considered normal aging, especially with older technology SCSI drives. -- Mike
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