Stuart Anderson wrote: > Probably a naive question, but what is the problem? If I have a > server with two paths to a tape drive and one path goes down why not > have the SCSI commands automatically use the remaining active path? > > Thanks. > > The short answer is that if a path fails on a disk you can just resend the command down another path and everything is fine. On tape if the path fails the command might have made it to tape or it might not have. Danger is getting either two copies of a specific block or none.
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