We have a 6-drive RAID-6 on one of our servers. Each drive is a 750GB Seagate, and they are connected with Hardware RAID card 3ware 9650SE. We do not have sparse drives. The system is old and probably is working for 2 years with this setting.
Yesterday after a change in software, I rebooted the system. I got the error that the array is degraded. I got this:
Number of offline units: 0, availabe drives: 0, hot sparse: 0, offline units: Unusable arrays: 6 Drives 64K RAID 6 2.72TB (arr1) DEGRADED SATA-ST3750330AS 698.63GB (Phy 11) SATA-ST3750330AS 698.63GB (Phy 1) Incomplete devices and others: SATA- Phy 0 SATA- Phy 8 SATA- Phy 9 SATA- Phy 10
Naturally I should be able to bypass this and recover the data. However, I could not. After the above description of the drives I got the error:
3ware BIOS is not installed
And it gets to another error that OS is not found.
I edited 3ware BIOS to bypass degraded drives error, but still getting the same error that 3ware BIOS is not installed.
How can I recover my data? If I do a rebuild is there a chance that I can get the data?
Also, what is this strange behaviour I got from RAID card?
Update: When I enter 3ware BIOS it gives me a notice that I have degraded array, and I have three options. One, rebuild if doesn't work remove not in use drive and rebuild. Second, check connections and insert new drive and rebuild. Third, do nothing and bypass.
I think that these are not specific to my problem, and it is a general approach.