>From: Richard Elling [mailto:richard.ell...@gmail.com] >Sent: Monday, April 19, 2010 10:17 PM > >Hi Geoff, >The Canucks have already won their last game of the season :-) >more below...
Hi Richard, I didn't watch the game last night, but obviously Vancouver better pick up their socks or they will be joining San Jose on the sidelines. With Ottawa, Montreal on the way out too, it could be a tough spring for Canadian hockey fans. > >On Apr 18, 2010, at 11:21 PM, Geoff Nordli wrote: > >> Hi Richard. >> >> Can you explain in a little bit more detail how this process works? >> >> Let's say you are writing from a remote virtual machine via an iscsi >target >> set for async writes and I take a snapshot of that volume. >> >> Are you saying any outstanding writes for that volume will need to be >> written to disk before the snapshot happens? > >Yes. That is interesting, so if your system is under write load and you are doing snapshots it could lead to problems. I was thinking writes wouldn't be an issue because they would be lazily written. With our particular use case we are going to do a "save state" on their virtual machines, which is going to write 100-400 MB per VM via CIFS or NFS, then we take a snapshot of the volume, which guarantees we get a consistent copy of their VM. When a class came to and end we could have maybe 20-30 VMs getting saved at the same time, which could mean several GB of data would need to get written in a short time frame and would need to get committed to disk. So it seems the best case would be to get those "save state" writes as sync and get them into a ZIL. Would you agree with that? > >I'm glad you enjoyed it. I'm looking forward to Vegas next week and >there >are some seats still open. > -- richard I would love to go to Vegas, but I need to work on getting our new product out the door. Enjoy yourself in Vegas next week! Geoff _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
