On Sat, Jan 07, 2006 at 11:02:25PM -0800, Mike Bird wrote: > 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.
Yea, that seems to be the most common. I built a 6 drive raid 10 array originally with 3 missing disks. That gave me the reliablity when I eventually filled in the missing disks and was no worse off than non-raid. As far as recovering LVM data, you can use the vgscan --partial option. It's supposed to do exactly as you describe. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
