01-29-2014
Firstly, the 0.5.0 will refer to the position in the SCSI chain; perhaps SCSI ID 5?
Don't worry about finding 0.0.0. It was how it was configured and which disks were selected by the sysadmin to go into the array.
So, your controller knows exactly what's going on; there are two RAID1 arrays and one of the disks has failed.
Do you know exactly which disk it is??? Pulling out the wrong disk will be fatal!!!!
Assuming you know EXACTLY which disk is in trouble, the first thing to try is to pull it out and simply push it back in. Then check the status again. If it says it's rebuilding then perhaps it was just a connection problem (poor contacts happen all the time). If it still says FAILED then replacement is needed.
Most disks show the number of LBA's on the label. LBA=logical blocks or sectors on the disk.
The replacement disk must be the same or greater number of LBA's for it to work. It stands to reason that you can't completely mirror a drive to one which is smaller. [Some disks which have exactly the same model number have different numbers of LBA's. Different versions of manufacture. So beware.]
If you do plug in a disk which is smaller then the RAID controller will refuse to do anything with it. It's not because the replacement is faulty.
If you plug in a disk that the controller is happy with then the status will go into REBUILD whilst the remirror is being done, followed by OPTIMAL when the remirror has finished.
These RAID controllers support hot-swap so no need to take the system down just make damned sure that you're pulling out the right disk.
Hope that helps.
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