Kanwar Ranbir Sandhu wrote: > Hi All, > > I have an external drive cage which has been configured with two > separate RAID 5 arrays. I then used LVM to create two PVs, and then > added the volumes together under one VG. The whole shebang is mounted > on one file system (/srv). > > What would happen if one of the RAID arrays failed (e.g. two drives die > in RAID 5 array 1)? Would the data be safe, would I lose all data, or > would I just lose the data that was on the failed array? > > I believe I would only lose the data on the failed array, but a friend > believe I would lose the whole lot. > > Thanks in advance! > > Regards, > > Ranbir Because they are one file system, it is hard to predict exactly what you would lose, but in any case, recovering the data from the remaining array would be interesting. I could be wrong, but I don't believe there is anything in the LVM code that would prevent a file from spanning the two RAID arrays making up the VG. So you can figure you are going to lose any files that span the drives. (You may be able to recover part of the file...) You may want to start looking into LVM recovery tools now, before you run into a problem. (And keep good backups.) Mikkel -- Do not meddle in the affairs of dragons, for thou art crunchy and taste good with Ketchup!
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