RAID1 is DEGRADED, but which disk is faulty?

[Peter Elsner]

Try rebuilding the array...

atacontrol rebuild ar0

See if that helps...

Peter Elsner


At 10:45 PM 9/3/2003 +1000, you wrote:
>Hi
>
>How do you tell which disk has problems in a hardware RAID1 array? My 
>machine has been up for nearly six months, and only the last three weeks 
>of messages logs are retained. There is nothing any in the last three 
>weeks of system logs about any kind of hardware error, or warning, or 
>anything mentioning ar0, ad4, or ad6.
>
>atacontrol is showing a DEGRADED status of the mirror:
>
># atacontrol status ar0
>ar0: ATA RAID1 subdisks: ad4 ad6 status: DEGRADED
>
>
>How does one tell which disk is faulty? Or is it possible that they've 
>become out of sync and need rebuilding, in which case which one do I 
>detach and reattach?
>
>I'm scared to reboot as it's a running server. What can I do????
>
>Cheers
>
>Jesse
>
>PS:
>
>FreeBSD 4.6.2-RELEASE
>
>atapci1: <Promise ATA100 controller> port 
>0xdc00-0xdc3f,0xe000-0xe003,0xe400-0xe407,0xe800-0xe803,0xec00-0xec07 mem 
>0xdffe0000-0xdfffffff irq 11 at device 16.0 on pci0
>
>ar0: 76293MB <ATA RAID1 array> [9726/255/63] status: READY subdisks:
>  0 READY ad4: 76319MB <ST380021A> [155061/16/63] at ata2-master UDMA100
>  1 READY ad6: 76319MB <ST380021A> [155061/16/63] at ata3-master UDMA100
>
>
># atacontrol list
>ATA channel 0:
>     Master:      no device present
>     Slave:       no device present
>ATA channel 1:
>     Master: acd0 <LG DVD-ROM DRD-8160B/1.01> ATA/ATAPI rev 0
>     Slave:       no device present
>ATA channel 2:
>     Master:  ad4 <ST380021A/3.19> ATA/ATAPI rev 5
>     Slave:       no device present
>ATA channel 3:
>     Master:  ad6 <ST380021A/3.19> ATA/ATAPI rev 5
>     Slave:       no device present
>
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Peter Elsner <peter at servplex.com>
Vice President Of Customer Service (And System Administrator)
1835 S. Carrier Parkway
Grand Prairie, Texas 75051
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