Christopher Browne wrote: > The world rejoiced as [EMAIL PROTECTED] (Peter and Sarah Childs) wrote: > > However there is a third way. That should be safe but some > > people may disagree with me! If you can "freeze" the disk while you > > take the backup. The backup can be used as if the computer had > > crashed with no hard disk failure at all. Ie WAL will be consistant > > and database may take longer but once it is up it will be safe (like > > paragaph 1). Now freezeing a disk for backup is not that > > difficult. You should be doing it anyway for user file > > consistancy. (You don't want the first 30 pages of you document to > > disagree with the end because somone was saving it during the > > backup! > > I heard D'Arcy Cain indicate that some SAN systems (I think he > mentioned NetApp) support this sort of thing, too. Digital's AdvFS > also supports it. > > Of course, if you take this approach, you have to make _certain_ that > when you "freeze" a replica of a filesystem, that _ALL_ of the > database is contained in that one filesystem. If you move WAL to a > different filesystem, bets would be off again...
Also, I assume you have to stop the server just for a moment while you do the freeze, right? -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])
