Greg Smith wrote: > On Tue, 9 Sep 2008, Magnus Hagander wrote: > >> As long as your SAN guarantees an atomic snapshot of all your data >> (which every SAN I've ever heard of guarantees if you're on a single >> volume - entry level SANs often don't have the functionality to do >> multi-volume atomic snapshots, though), you don't need to set up PITR >> for simple backups > > It's all those ifs in there that leave me still recommending it. It's > certainly possible to get a consistant snapshot with the right hardware > and setup. What concerns me about recommending that without a long list > of caveats is the kinds of corruption you'd get if all those conditions > aren't perfect will of course not ever happen during testing. Murphy > says that it will happen only when you find yourself really needing that > snapshot to work one day. Well, I agree one should be careful, but I don't see the risk if you just change all those ifs into a single one, which is "if all your data *and* WAL is on the same SAN LUN". (heck, you don't need hardware to do it, you can do software snapshot just fine - as long as you keep all your stuff on the same mountpoint there as well) //Magnus
