Ok, this is the case:
I've got two raid-5 arrays with software raid, both with three disks.
Setup: md0 has hdb2, hdd1 and sda1 md1 has hdb5, hdd3 and sda3
Tonight, the system lost power due to a power spike. The result was a reboot where it attempted to fix the raid, but it didn't exactly work. I have now booted a live CD and using utilities there.
It seems the checksum value is slightly off for all disks. And the update time is the same for some disks, but not all.
When I try mdadm --assemble /dev/md1 (or md0) with various options like force, scan, auto, etc - I get error messages like only 1 drive found, not enough.. no disks found and no mention of md0/1 found in config file.
What should I do? Which partitions (two in each array) do I pick as "these two are the one I should rebuild with"? And how do I actually FORCE mdadm to start an array with those two set devices?
See files in http://gandalf.n4f.no/~aj/md/ for output from mdadm.
Assistance deeply appreciated...
ajulvestad wrote:
Ok, this is the case:
I've got two raid-5 arrays with software raid, both with three disks. Setup: md0 has hdb2, hdd1 and sda1 md1 has hdb5, hdd3 and sda3 Tonight, the system lost power due to a power spike. The result was a reboot where it attempted to fix the raid, but it didn't exactly work. I have now booted a live CD and using utilities there. It seems the checksum value is slightly off for all disks. And the update time is the same for some disks, but not all. When I try mdadm --assemble /dev/md1 (or md0) with various options like force, scan, auto, etc - I get error messages like only 1 drive found, not enough.. no disks found and no mention of md0/1 found in config file. What should I do? Which partitions (two in each array) do I pick as "these two are the one I should rebuild with"? And how do I actually FORCE mdadm to start an array with those two set devices? See files in http://gandalf.n4f.no/~aj/md/ for output from mdadm. Assistance deeply appreciated...
Johnny Hughes writes:
ajulvestad wrote:
Ok, this is the case:
I've got two raid-5 arrays with software raid, both with three disks. Setup: md0 has hdb2, hdd1 and sda1 md1 has hdb5, hdd3 and sda3 Tonight, the system lost power due to a power spike. The result was a reboot where it attempted to fix the raid, but it didn't exactly work. I have now booted a live CD and using utilities there. It seems the checksum value is slightly off for all disks. And the update time is the same for some disks, but not all. When I try mdadm --assemble /dev/md1 (or md0) with various options like force, scan, auto, etc - I get error messages like only 1 drive found, not enough.. no disks found and no mention of md0/1 found in config file. What should I do? Which partitions (two in each array) do I pick as "these two are the one I should rebuild with"? And how do I actually FORCE mdadm to start an array with those two set devices? See files in http://gandalf.n4f.no/~aj/md/ for output from mdadm. Assistance deeply appreciated...
Thank you for the URL, but I have already seen the howto. Running mdadm --assemble --force only provides the message that there is only one disk available. So what I'm looking for is a way to tell mdadm exactly what devices to use for the array.
Quoting ajulvestad ajulvestad@n4f.no:
Johnny Hughes writes:
ajulvestad wrote:
Ok, this is the case: I've got two raid-5 arrays with software raid, both with three disks. Setup: md0 has hdb2, hdd1 and sda1 md1 has hdb5, hdd3 and sda3
*snip*
Thank you for the URL, but I have already seen the howto. Running mdadm --assemble --force only provides the message that there is only one disk available. So what I'm looking for is a way to tell mdadm exactly what devices to use for the array.
Silly question, but can the system see sda, hdb & hdd?
can you see anything from "fdisk -l /dev/sda" - the same for hdb and hdd?
Steven Haigh writes:
Quoting ajulvestad ajulvestad@n4f.no:
Johnny Hughes writes:
ajulvestad wrote:
Ok, this is the case: I've got two raid-5 arrays with software raid, both with three disks. Setup: md0 has hdb2, hdd1 and sda1 md1 has hdb5, hdd3 and sda3
*snip*
Thank you for the URL, but I have already seen the howto. Running mdadm --assemble --force only provides the message that there is only one disk available. So what I'm looking for is a way to tell mdadm exactly what devices to use for the array.
Silly question, but can the system see sda, hdb & hdd?
can you see anything from "fdisk -l /dev/sda" - the same for hdb and hdd?
Yes, the partitions are all there. The files on the URL are all from the system at the moment. And fdisk is listing all the partitions as well.
ajulvestad spake the following on 7/26/2007 8:32 PM:
Steven Haigh writes:
Quoting ajulvestad ajulvestad@n4f.no:
Johnny Hughes writes:
ajulvestad wrote:
Ok, this is the case: I've got two raid-5 arrays with software raid, both with three disks. Setup: md0 has hdb2, hdd1 and sda1 md1 has hdb5, hdd3 and sda3
*snip*
Thank you for the URL, but I have already seen the howto. Running mdadm --assemble --force only provides the message that there is only one disk available. So what I'm looking for is a way to tell mdadm exactly what devices to use for the array.
Silly question, but can the system see sda, hdb & hdd? can you see anything from "fdisk -l /dev/sda" - the same for hdb and hdd?
Yes, the partitions are all there. The files on the URL are all from the system at the moment. And fdisk is listing all the partitions as well.
Try something like mdadm --assemble --run --force --update=summaries /dev/raidarray /dev/firstpart /dev/2ndpart /dev/3rdpart Substitute your actual parameters
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ajulvestad -
Johnny Hughes -
Scott Silva -
Steven Haigh