VERY Slow Backup from disk to tape
Posted on 2009-07-07
I have an HP AIO storage device that I backup my Exchange mailboxes to every night. It backs up from a remote Exchange box to disk on that server. Once that job has completed, I have a duplicate job that sends the Exchange backup to tape (local LTO3 HP AutoLoader). When I first set it up I was getting speeds of around 2400-3000MB/min. My backups would complete in a timely fashion & all was good.
Recently my backup to tape jobs have slowed down to a crawl at between 20-36MB/min (once it reaches 36MB/min it doesn't progress higher or lower. I have talked to Symantec & they are convinced that everything is correct & nothing can be done (ie - Symantec drivers, Unknown media changer etc). I have spent HOURS on the phone with HP & have been sent a new tape drive, new U320 SCSI controller card & a new SCSI cable all to no avail.
Does ANYONE have any clue as to what is going on? I have run the HP Library & Tools application which shows that the speed of the backup is just as slow (although it is intermittent, one time it will be fast & then the next time it won't be). Some weird things that happened are that I put in a new LSI U320 SCSI driver & the next job I ran went at full speed, the very next job was back down to the super slow speed.
Does anyone have any suggestions on what to try next? It is a Windows Storage Server 2003 device & I am running Backup Exec 12.5 SP2.