Sun Storage 7000 Unified Storage System: NDMP Level 0 Snapshots Not Being Automatically Deleted

Asset ID:	1-72-1559967.1
Update Date:	2018-01-05
Keywords:

Solution Type Problem Resolution Sure

Solution 1559967.1 : Sun Storage 7000 Unified Storage System: NDMP Level 0 Snapshots Not Being Automatically Deleted

Applies to:

Sun ZFS Storage 7420 - Version All Versions and later
Sun ZFS Storage 7320 - Version All Versions and later
Sun Storage 7110 Unified Storage System - Version All Versions and later
Sun ZFS Storage 7120 - Version All Versions and later
Sun Storage 7210 Unified Storage System - Version All Versions and later
7000 Appliance OS (Fishworks)

Symptoms

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Snapshots generated by NDMP are not automatically being cleaned up.

This leaves old snapshots and consume space.

On a nfs mount of the snapshot, noticed that there are more than one level0 (full) ndmp snapshot exists

host1:/net/zfs7320/export/esx/linux_admin/.zfs/snapshot# ls -las *ndmp*

3 drwx------ 12 root root 12 Feb 19 14:09 .ndmp.0.level.r.1365151282.608809 <===
3 drwx------ 12 root root 12 Feb 19 14:09 .ndmp.0.level.r.1365758545.568086 <===
3 drwx------ 12 root root 12 Feb 19 14:09 .ndmp.0.level.r.1366363261.770395 <===
3 drwx------ 12 root root 12 Apr 22 10:26 .ndmp.1.level.r.1366622530.364712
3 drwx------ 12 root root 12 Feb 19 14:09 .ndmp.2.level.r.1366190519.220518
3 drwx------ 12 root root 12 Feb 19 14:09 .ndmp.3.level.r.1366276877.512496
3 drwx------ 12 root root 12 Feb 19 14:09 .ndmp.4.level.r.1365672038.21333

Cause

This is a configuration issue.

Ideally on every level0 (full) snapshot taken, the 'current' snapshot has to be replaced.

To achieve this, the UPDATE behavior at DMA (Data Management Application) host needs to be set to 'Y' explicitly

If the UPDATE is not set, the temporary snapshot will be deleted immediately after backup and any existing temporary snapshot for the same LEVEL, DMP_NAME and ZFS_MODE will be preserved.

The syntax for the naming of this snapshot is as follows: ndmp.$LEVEL.$DMP_NAME.$ZFS_MODE

Example: ndmp.0.level.r.1279023238.107462

"ndmp" indicates that this snapshot was generated by the NDMP service.

"0" indicates that this is a Level 0 (full) backup.

"level" is the default DMP_NAME.

"r" indicates a recursive backup as indicated by ZFS_MODE (other values could be "d" for dataset).

The rest of the string is a system generated timestamp.

Solution

Set the policy UPDATE = Y, explicitly at DMA(Data Management Application) host.

Example...

Symantec NetBackup :

SET TYPE=ZFS
SET UPDATE=Y

NETBACKUP-DMA

Networker

NETWORKER-DMA

References

<NOTE:1387930.1> - Sun Storage 7000 Unified Storage System: How to Troubleshoot NDMP Issues
<NOTE:1387918.1> - Sun Storage 7000 Unified Storage System: Resolving NDMP configuration issues

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