From: Gabriel Ambuehl <[EMAIL PROTECTED]>
Reply-To: Gabriel Ambuehl <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED], [EMAIL PROTECTED]
Subject: atacontrol weirdness: RAID 1 array is shown to be degraded but bothdisks are up
Date: Fri, 6 Feb 2004 19:30:29 +0100
The 4.9 box has got onboard Promise RAID which so far has worked just fine.
However, today I got a report about a degraded disk array so I went to check and found something rather odd:
$ atacontrol list ATA channel 0: Master: no device present Slave: no device present ATA channel 1: Master: no device present Slave: no device present ATA channel 2: Master: no device present Slave: no device present ATA channel 3: Master: ad6 <WDC WD800BB-00CAA1/17.07W17> ATA/ATAPI rev 5 Slave: ad7 <WDC WD800BB-00CAA1/17.07W17> ATA/ATAPI rev 5 $ atacontrol status 0 ar0: ATA RAID1 subdisks: ad6 ad7 status: DEGRADED
How can a RAID array be degraded when both disks are still there? How do I figure out what disk holds the current set of data? And what do I need to do, anyway?
The disk won't disappear from FreeBSD's device list unless it is removed intentionall.
For Promise IDE based RAID systems, the best way to find out which one has failed is to boot into the RAID BIOS and look. It will tell you which one has failed. You can then replace that drive and rebuild the array.
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