At 18:26 +0200 3/9/2003, Ruben de Groot wrote:
On Wed, Sep 03, 2003 at 10:45:05PM +1000, jesse reynolds typed:
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????

You can try this:


umount /dev/ar0
fsck -f -n /dev/ad4
fsck -f -n /dev/ad6

This way (hopefully) you'll be able to establish which one of the disks
in the array has developed problems. Then reboot and rebuild the array
from the other disk using the controllers firmware.


Given that all the filesystems, including /, are on this mirror ar0, I would have to boot it up off a live CD or some such in order to do an fsck on both the submirrors.

Hmmm. I wouldn't be able to do an fsck on /dev/ad4 or /dev/ad6 though because they are not filesystems, they're the full disks which in turn contain freebsd slices.

Is it safe to shut it down and see what the Promise firmware is saying? Or will i then lose the ability to tell which disk is good and which has problems?

Thankyou

Jesse





Ruben


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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--

  ::: Jesse Reynolds +61 (0)414 669 790 ::: AIM - jessedreynolds :::
  ::: Virtual Artists Pty Ltd, Adelaide ::: http://www.va.com.au :::
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