08-17-2015 02:22 AM
Dear Forum,
Backing up data on disk storage (SAN - VNX) space getting very less performance speed.
Speed is only 6-7 MB per stream and there is 18 streams in each backup job.
I am on Solaris 11 Master/Media and Client is W2K12 R2.
Whereas on the same setup when i backup some different data over tape the speed is around 40-50 Mbps per stream.
Following is set on Media server
Number Data Buffers : 64
Size Data Buffers : 256
Is there any other paramater to be set for Disk Storage Unit for high performance.
Solved! Go to Solution.
08-17-2015 04:31 AM
You can expect to get 75MB/sec per 4+1 stripe sustained (Write cache can cheat you).
Doing more than 70MB/sec require striping across LUN volumes combining the write capability of multiple LUN's.
Try reducing the number of concurrent write steam to disk to see if performance increases.
08-17-2015 02:51 AM
Searching more on this, i came across NUMBER DATA BUFFERS DISK and Size, that i have set to 64 & 512.
08-17-2015 02:56 AM
08-17-2015 03:01 AM
I am battling to understand what exactly the data path is.
If Master/Media and Client is W2K12 R2 where does Solaris 11 fit in the picture?
Are you backing up clients across the network?
Which type of NIC in the master/media server?
If you have a 1 Gb NIC in the media server, then 6-7MB/sec * 18 streams give a total throughput of over 100MB/sec - the max that a 1GB NIC can accommodate....
08-17-2015 03:31 AM
How is the storage prsented from the VNX, as LUN in a raid pool or dedicated 4+1 stripes ?
08-17-2015 04:14 AM
Yes, i am backing up Exchange data over network on this Solaris Media server havaing 10GB NIC.
and yes the VNX is presented as LUN dedicated 4+1 stripes.
08-17-2015 04:31 AM
You can expect to get 75MB/sec per 4+1 stripe sustained (Write cache can cheat you).
Doing more than 70MB/sec require striping across LUN volumes combining the write capability of multiple LUN's.
Try reducing the number of concurrent write steam to disk to see if performance increases.
08-17-2015 04:32 AM
Log folders to troubleshoot NBU transfer rates:
On media server: bptm
On client: bpbkar
Always best to use OS and network utilities to test all components in the backup path:
1) Read speed from disk on the client
2) Write speed to backup storage on the media server
3) Network transfer between client and media server
See:
The NetBackup Backup Planning and Performance Tuning Guide, Release 7.5 and Release 7.6
http://www.symantec.com/docs/DOC7449
08-30-2015 10:11 PM
Yes ...logged the folders...but no improvement seen for further analysis.
08-30-2015 11:21 PM