On Sat, 2006-01-07 at 22:15, Daniel Webb wrote: > On Sat, Jan 07, 2006 at 09:02:20PM -0800, Mike Bird wrote: > Well, yes, but supposing you *do* have a failure? Then what? Half the > filesystem is still there on the second disk, is it recoverable, and if not, > why not?
You may get some of the data. You probably won't get all of it. I've had the great good fortune to have a group of bad blocks develop at a place on a drive where no data was currently stored, and I've lost data to bad blocks too. > I'm getting the impression that spanning volume groups with a logical volume > is a *very* bad idea unless the physical volumes are RAID. A VG built on two single drive PV's is twice as large but roughly half as reliable as a single drive. Depending upon the kind of data, that may or may not be a bad idea. Almost all of our VG's are built on RAID-1 PV's. However, we have a VG which contains the LV which contains our partial Debian mirror, together with a bunch of similar stuff. It's huge but it can be rebuilt if a drive dies. It's not worth it to us to double up the 1.8TB to get RAID-1 protection that isn't needed for that particular kind of data. --Mike Bird -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
