Gee that's tough.

Posted Mar 21, 2007 13:40 UTC (Wed) by mennucc1 (guest, #14730)
In reply to: Gee that's tough. by drag
Parent article: The 2007 Linux Storage and File Systems Workshop

> Most of the features of ZFS are aviable on Linux right now.

but still I would like to have snapshots in EXT (maybe in 5 :-) ?)

to post comments

Gee that's tough.

Posted Mar 21, 2007 16:06 UTC (Wed) by bronson (guest, #4806) [Link] (1 responses)

For snapshotting, just run whatever filesystem you want on top of LVM. LVM is a little hard to get used to at first but it's definitely worth the effort. Here are some notes I took when setting it up on my systems: http://wiki.u32.net/LVM

I now put all nontrivial partitions on LVM. Works for me. I'll let others argue whether LVM snapshots are worse than ZFS, or if ZFS is a layering violation. :)

Gee that's tough.

Posted Mar 22, 2007 5:55 UTC (Thu) by snitm (guest, #4031) [Link]

LVM2 Snapshots are quite bad. For starters they are done at the block-level whereas ZFS provides file-level snapshots (aka redirect on write). LVM2 snapshots don't scale well either; seeing as each snapshot imposes a copy out penalty because there isn't a shared exception store (aka LVM snapshot LV) for all snapshots of an origin LV.