Bill> When you start a volume level NDMP backup, Data ONTAP takes a Bill> snapshot, does its backup from that snapshot, then deletes that Bill> snapshot. If the data is basically static at the time you wish Bill> to perform your backup then you could take your named snapshot Bill> for faster recovery purposes and immediately thereafter start Bill> the volume level NDMP backup - assuming you have available Bill> destination devices.
That's the kicker, I probably *won't* have enough available tape drives to run all the volumes in parallel, since I need to make sure my backups (snapshots) are taken close in time.
Bill> Otherwise, what you have described will likely give the best Bill> performance.
Can you give an idea of show slow NDMP backup of a named snapshot is versus a regular NDMP backup using it's own snapshot? 25% slowdown? 50%? I'm running on a FAS3140 which shouldn't too loaded at all.
I'm also working within the limitations of CommVault 9, so I may not be able to specify a named snapshot to backup from there anyway.
Thanks for all your feedback. John
Bill> On Wed, May 9, 2012 at 2:33 PM, John Stoffel Bill> john.stoffel@taec.toshiba.comwrote:
Bill> Even if it is possible, I would recommend against it. Bill> Performance of an NDMP backup from a named snapshot is Bill> significantly slower than a volume level NDMP backup.
Blech, not good to hear.
Bill> Are you performing your backup directly from your source volume Bill> or a snapvault secondary volume?
Ideally, directly from the source volumes, plural. I'm going to need to backup the volumes from a snapshot time that's as close as possible to the same time, then I can take my time doing the actual NDMP to tape of the data.
So it's looking like my best plan would be to just do:
foreach v (data_a data_b data_c) snap create $v flexclone_backup vol clone create ${v}_clone_bkp -s none -b ${v} flexclone_backup done
then backup my new data_a_clone_bkup... volumes via NDMP.
John
Bill> On Wed, May 9, 2012 at 1:53 PM, John Stoffel Bill> john.stoffel@taec.toshiba.comwrote:
Guys,
Anyone know if it's possible do an NDMP backup (using CommVault) of a *named* snapshot? Basically I need to snapshot two or more volumes at the same time (I can do this in a pre-script) and then let the snapshots be backed up.
I guess I could be silly and just create a flex clone volumes and then back those volumes up instead, which would get rid of the issue, but would complicate things a bit more.
Thanks, John John Stoffel - Senior Staff Systems Administrator - System LSI Group Toshiba America Electronic Components, Inc. -
john.stoffel@taec.toshiba.com - 508-486-1087 _______________________________________________ Toasters mailing list Toasters@teaparty.net http://www.teaparty.net/mailman/listinfo/toasters