Correct. It uses the existing
snapmirror snapshot when the NDMP backup kicks off. A NDMP backup for the
following started at 1:00 AM. It’s using the existing snapmirror
snapshot, which will, of course, exist until the NDMP backup completes or fails:
xp10b> snap list HQ1_XP10R_HQ1_Shared_02_sm
Volume HQ1_XP10R_HQ1_Shared_02_sm
working...
%/used %/total
date name
---------- ----------
------------ --------
0% ( 0%) 0% (
0%) Nov 23 14:20 xp10b(0118061712)_HQ1_XP10R_HQ1_Shared_02_sm.15897
0% ( 0%) 0% (
0%) Nov 23 13:20 xp10b(0118061712)_HQ1_XP10R_HQ1_Shared_02_sm.15896
0% ( 0%) 0% (
0%) Nov 23 12:02 hourly.0
0% ( 0%) 0% (
0%) Nov 23 10:03 hourly.1
0% ( 0%) 0% (
0%) Nov 23 06:01 hourly.2
0% ( 0%) 0% (
0%) Nov 23 00:20 xp10b(0118061712)_HQ1_XP10R_HQ1_Shared_02_sm.15883
(busy,backup[3],dump)
0% ( 0%) 0% (
0%) Nov 23 00:02 nightly.0
0% ( 0%) 0% (
0%) Nov 22 16:02 hourly.3
0% ( 0%) 0% (
0%) Nov 22 00:02 nightly.1
0% ( 0%) 0% (
0%) Nov 21 00:02 nightly.2
0% ( 0%) 0% (
0%) Nov 20 00:02 nightly.3
0% ( 0%) 0% (
0%) Nov 19 00:02 nightly.4
0% ( 0%) 0% (
0%) Nov 18 00:03 nightly.5
0% ( 0%) 0% (
0%) Nov 17 00:02 nightly.6
0% ( 0%) 0% (
0%) Nov 16 00:03 nightly.7
============
Ed Alexander
Senior Infrastructure Engineer
Genworth Financial
6601
Phone: 919-870-2147
From:
owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Kennedy, Jeffrey
Sent: Tuesday, November 23, 2010
2:54 PM
To: Fred Grieco; Jeremy Webber
Cc: toasters@mathworks.com
Subject: RE: NDMP backup of
snapmirror target
If I’m
understanding you and Ed correctly though, the backup software in both cases
used an existing snapshot, it did not make a snapshot itself?
At some point in the
past Netbackup, Bodtool, Commvault, etc., would all create their own
backup_stuff.0 snapshot what was specifically for NDMP backups and was
(supposedly) deleted when the backup completed.
It sounds to me like
the backup software may have gotten smarter and will automatically use the most
recent snapshot if it can’t create one itself.
Jeff Kennedy
Qualcomm, Incorporated
QCT Engineering
Compute
858-651-6592
From: Fred Grieco
[mailto:fredgrieco@yahoo.com]
Sent: Tuesday, November 23, 2010
11:35 AM
To: Kennedy, Jeffrey; Jeremy
Webber
Cc: toasters@mathworks.com
Subject: Re: NDMP backup of
snapmirror target
I was doing the my most recent testing on Ontap
7.3.3, using Backup exec 12.5. The NDMP backup worked. I selected
the volume for backup, as Backup Exec will not let me specify a particular
snapshot. I monitored the snapshots in System Manager-- it looked like
the NDMP process used the most recent snapshot, as it put it in Busy/Dump
status.
Fred
From:
"Kennedy, Jeffrey" <jkennedy@qualcomm.com>
To: Jeremy Webber
<Jeremy.Webber@al.com.au>
Cc: Fred Grieco
<fredgrieco@yahoo.com>; "toasters@mathworks.com"
<toasters@mathworks.com>
Sent: Tue, November 23, 2010
2:14:33 PM
Subject: RE: NDMP backup of
snapmirror target
I would be very
interested to hear from Netapp contributors if NDMP backups of volume
snapmirror’s has changed. My education at the time was that volume
level snapmirror’s are RO for all blocks, which means inode pointers
could not change since that meant a change to blocks *in* the volume.
QSM/Snapvault has
never suffered from this issue.
Jeff Kennedy
Qualcomm, Incorporated
QCT Engineering
Compute
858-651-6592
From: Jeremy Webber
[mailto:Jeremy.Webber@al.com.au]
Sent: Sunday, November 21, 2010
6:22 PM
To: Kennedy, Jeffrey
Cc: Jeremy Webber; Fred Grieco;
toasters@mathworks.com
Subject: Re: NDMP backup of
snapmirror target
Maybe there were limitations in earlier versions of OnTAP but I can
confirm that we do tape backups, via tape, from a snapmirror destination
without having to break the snapmirror relationship.
A snapshot is automatically created in the snapmirror destination for
the duration of the NDMP job.
I can't recall if subsequent snapmirror updates fail during the backup
and am not able to test this right now.
OnTAP 7.3.2.
-jeremy
On 17/11/2010, at 6:11 AM, Kennedy, Jeffrey wrote:
Things may have
changed in OT since I last was concerned with tape backups but as I recall a
snapmirrored *volume* can’t
take the backup snapshot because it’s RO. So you point the backup
software at the newest snapshot in the RO volume and back up that view.
The only reason the
NDMP backup makes a snapshot is to guarantee consistency. An existing
snapshot already has that.
Jeff Kennedy
Qualcomm, Incorporated
QCT Engineering
Compute
858-651-6592
From: owner-toasters@mathworks.com
[mailto:owner-toasters@mathworks.com] On
Behalf Of Fred Grieco
Sent: Tuesday, November 16, 2010 6:26 AM
To: toasters@mathworks.com
Subject: NDMP backup of snapmirror target
I am
snapmirroring several volumes to a DR site, and I would like to do tape backups
at that site. How should I do them? Can I use NDMP?
It seems like I can't do straight NDMP because the replicated target is
read-only. I am currently creating flexclones from snapshots existing in
the volume (nightly.0...) but flexclone then locks this snapshot and snapmirror
will fail to update ( I'm not sure if this happens at the next update or
when the source system attempts to remove that snapshot and copy it over... I
wasn't watching).
What do you generally do to get snapmirrored volume data to tape?
TIA,
Fred
--
Jeremy Webber
Senior Systems Engineer
Animal Logic Pty Ltd
T: +61 2 9383 4837
F: +61 2 9383 4801