Arcserve backup gradually slowing down
Posted on 2012-12-20
Hello, I have an Arcserve backup job that runs every night. The job takes around 11hrs to backup 640Gb of data.
The backup starts at around 4,000Mb/min, and as time goes on it gradually slows down to around 500Mb/min.
I have tried this on both our SCSI LTO drive, and USB3 RDX drive, and they both behave the same way.
The biggest file in the backup is 420Gb, and this is where the major slowdown happens.
It seems that the job speeds up again once it completes every "subjob" (Exchange, SQL etc etc)
So every subjob will start at around 4,000Mb/min, and gradually slow down. So the bigger the files it has to backup, the slower it will get.
This will happen no matter where the data is, over the network or on a local disk...
I dont think its the network, as while this backup is running, I can copy data to the local server at over 6,000Mb/min...... and bakup to disk jobs in Arcserve run fine. It seems its only backup to tape jobs.
I also question if its the hardware, as both USB and SCSI devices behave the same way.
Any help would be appreciated.