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Basic considerations for NDMP backup performance

In this Document

Purpose

Details

1- zfs-based stream

2- backup software configuration

2.1 - How to Configure - Oracle Secure Backup

2.2 - How to Configure - Symantec Netbackup

2.3 - How to Configure – EMC (formerly Legato) Networker

3- further information

4- Limits

References

Applies to:

Purpose

This document provides information about expected performance and limits for NDMP backups.

It provides command lines for the following backup software :

• Oracle Secure Backup 10.3.0.2
• Symantec Netbackup 6.5.x & 7.0
• EMC (formerly Legato) Networker 7.5 & 7.6

Details

1- zfs-based stream

ZFS-based stream facility has been introduced in 2010.Q3.1 (See CR 6913998 : ndmp_ak support for zfs-based backup/restore). With ZFS-based NDMP stream, the performance is no longer gated by the ability to stat/open/read/close files as has traditionally be the case. iSCSI and/or FC volumes can be backup-ed too. Using zfs send/recv it is more gated by the hardware and the ability to have zfs open the stream and read the data. For large files, there is not so much difference. For small files, there can be an huge improvement, for example :

 Mixed size files on a 128kb share
* dump method = 31 MB/sec
* ZFS = 97.3 MB/sec

Database files on 8kb share
* dump = 39.7 MB/sec
* ZFS = 73.9 MB/sec

Millions of small (8kb) files with 25,000 file per directory (traditionally the 7000 worst performer)
* dump = 1.01 MB/sec
* ZFS = 65.1 MB/sec

2- backup software configuration

2.1 - How to Configure - Oracle Secure Backup

Set backup type in mkhost/chhost configuration
* mkhost -B zfs / chhost -B zfs
* Setting the NDMP backupev or restorev does not work. Must be “-ndmpbackuptype (-B)” setting
Set dataset (ds) configuration to include the ZFS dataset path
include host my7000
include path /pool_1/local/osb_proj/fs1

2.2 - How to Configure - Symantec Netbackup

Override default TYPE in Backup Selection tab ofpolicy
SET TYPE=zfs
/pool_1/local/userdata_proj/fs1

2.3 - How to Configure – EMC (formerly Legato) Networker

* Include ZFS dataset name in SaveSet selection field
* Remove all Application Data Entries
* No HIST/UPDATE/DIRECT variables needed
* Set ZFS type in backup command
nsrndmp_save -T zfs -c 7000 -l full -g Default
/pool_0/local/db_proj/logfile_share

3- further information

See https://YOURAPPLIANCEIPADDR:215/wiki/index.php/Configuration:Services:NDMP :

The NDMP protocol does not specify a backup data format. The appliance supports three backup types corresponding to different implementations and on-tape formats. DMAs can select a backup type using the following values for the NDMP environment variable "TYPE":

* dump - File-based for filesystems only. Supports file history and direct access recovery (DAR).
* tar - File-based for filesystems only. Supports file history and direct access recovery (DAR).
* zfs - Share-based for both filesystems and volumes. Does not support file history or direct access recovery (DAR), but may be faster for some datasets. Only supported with NDMPv4.

4- Limits

Current implementation can only take backup and perform restores on entire ZFS dataset

* /pool_0/local/oracle_db_proj1/datafiles1
* No subdirs, no individual files for NFS/CIFS shares

This means that all restores of NFS/CIFS shares have to restore entire dataset. No method to restore individual files or dirs.

Back to <Document 1387930.1> Sun Storage 7000 Unified Storage System: How to Troubleshoot NDMP Issues.

References

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