Commvault 11.32
1PiB of back-end data (compressed/deduped/stored size)
Aux copying data from secondary copy of backup data.
Four physical media agents on-prem
Four virtual media agents in Azure
5Gbps ExpressRoute circuit from on-prem to Azure
There is about 20ms of latency between the physical on-prem MAs and the Azure virtual MAs
We have deduplication/DASH copy enabled. We saw atrocious performance, from the start.
Seeing that 20ms of latency would certainly impact DDB look-ups on the virtual MAs, we turned on “Source Side Disk Cache” in the storage policy copy (we kept the default 8192MB cache size).
It’s running a little bit faster, but still pretty sluggish.
Would we expect to see a further boost in performance by expanding the “Source Side Disk Cache” from 8192MB to ~128000MB? That should further reduce the incidence of remote DDB look-ups on the Azure virtual MAs, right?
Are there any other best practices for speeding up the transmissing of Commvault aux copies from an on-prem site to Azure virtual MAs via ExpressRoute, and on to Commvault Air-Gap Protect?
Thanks in advance!
