topic Re: NDMP backup question in ONTAP Discussions

NDMP backup question

zbrenner_1 — Thu, 05 Jun 2025 07:02:27 GMT

Hi,

My question is about snapshot corrupstions in a tape backup time.

The situation: there 2 site. On primary site there is a SMVI backup with 5 snapshots and after backup the SMVI_snapvault

script send the snapshot to secondary site every day at 10pm. On the secondary site there is a CA server with NDMP communication and control

the backup between Sec storage FC and tape library FC. This backup starts every friday at 11pm. CA search a "SMVI_daily_recent.0" snapshot on secondary storage and needs to send about 900GB data. The backup time depend on volume size. Now about 23-24 hours long bacause 900GB 1,3TB volume size.

Could it be corrupted data on the tape if CA not finised its job but SMVI_daily_recent.0 renamed to SMVI_daily_recent.1 after 10pm?

How could be resolve this problem?

Should I rename the snapshot from SMVI_daily_recent.0 to SMVI_daily_dont_touch while I backup the weekly tape?

Regards

Re: NDMP backup question

rmharwood — Thu, 13 Jan 2011 13:06:00 GMT

When you run an NDMP dump the filer will take and use a snapshot of the volume which will be held as busy until the dump is completed. So, you cannot have corruption when another snapshot is scheduled. What I don't know, however, is how SMVI and/or Snapvault will react to a busy snapshot. I believe a busy snapshot can be renamed without affecting anything?

Richard

Re: NDMP backup question

zbrenner_1 — Thu, 13 Jan 2011 13:30:40 GMT

OK.

So I have to check the status of the recent.0 snapshot while the NDMP dump running.

And I have to check the rename procedure at 10pm.