Hi All,
hope you can advise.
We have a 2040 (OnTapp 8.0.2P2) on a DR site to which we snapmirror from our live site.
We have a volume for archiving general files from live and another vol for archiving old Virtual machines...
The DR filer is fibre attached to a Quantum Scalar i80 with LTO5 drives
Also fibre attached is a Netbackup 7.5 server
We're seeing a consistant ceiling of approx 65MB/s using direct NDMP. I see people on here bemoaning 120MB/s limitations, if we could get anywhere near that I would be very happy.
So today I am doing an ndmp backup of old virtual machines - it's a very low file count, approx 900GB of data and it's still only getting 65MB/s
The underlying aggregate is only 13 x 7200K Sata disks. This is a capacity system, not performance. However there's not a lot going on with this filer apart from receiving snapmirrors from live so I'm surprised if the disks can't push harder than that.
Are there any methods to diagnose where the bottleneck is?
Am I expecting too much from these disks?
Are there any tuning parameters I can change?
Lastly, in case I have a fit of bookishness, is there a good tech doc which covers NDMP performance that I might reasonably understand? (I have a lot of other systems to look after too and am not a netapp expert)!
Many thanks in advance
Andy