Full backup performance

[MattG]

I have 3 files server VMs with this config:
- C: drive on VMDK
- 1TB E: drive on vRDM
- 1TB F: drive on vRDM

All 3 servers perform a weekly full without CBT (it is set to CBT), in Virtual Appliance mode with Hot-add, and daily incrementals. The incrementals work with CBT and are extremely fast.

The full backups are extremely slow. For example one of these hosts has 965GB of actual data and it took 45 hours to run at a rate of 12/MBs.

Are these normal numbers?

-MattG

[Gostev]

I've split this into new topic not to derail the original thread you chose to post this into with environment-specific issue.

Yes, this might very well be "normal" for your backup server and source/target storage performance. But still 2x slower than in the worst lab I have access to and 50x slower then some customers having top hardware reported.

Also, don't look at CBT processing performance, this will always be extremely fast because of so little data being processed compared to full (there are typically only 1-2% of changed blocks daily in an average VM). Because of that, even on slow setups the processing rates will be awesome. Real performance testing can only be done on full backup.

Thanks.

[ca107]

MattG,

do you read/write from/to iSCSI when you backup?

[Utl1978]

Hello everybody!

I got a similar issue here.

We (full-)backup our vCenter 4.1 once a week on Friday. (22 VMs, ~4,5 TB).

Backup from EMC² AX4, SATA and SAS LUNs to a ML150 (singe CPU E5520, 12 GB RAM, Adaptec 6445, 4*2TB Stripeset)

First machine is backuped with 165 MB/s. (looks good I think )
BUT: Overall proacessing rate !!! 19 MB/s !!!

Any ideas ?!

Cheers

Joerg

[Gostev]

Hi Joerg, could be just some processing rate display glitch. Hard to say. Kindly please contact our support directly with any technical issues. Thanks.