Well, I finally upgraded to backupexec 12 with the main reason being that it allowed for tape block sizes greater than 64KB.
Supposedly the newer LTO 3 and 4 tape drives will only reach their peak throughput with the larger block sizes.
Our current scheme is a B2D job then a duplicate to tape.
I ran a comparison of 3 different block sizes on our current BackupExec server to see if it made a difference.
I ran 3 backups of a 22GB folder that sits on the drive on the Backupexec backup server that is attached to our san.
Here was the results.
Block Size Bytes Throughput Elasped Time
64 KB w/default settings 24,296,138,418 1819.00 MB/MIN 18:47 Mim
256KB 24,296,138,418 1871.00 MB/MIN 18:34 Min
512KB 24,296,138,418 1826.00 MB/MIN 18:30 Min
The 256 and 512 backups were with a buffer size of 1 MB and buffer count of 20
Not much an improvement.
The sytem in use is a Dell 1955 Blade w/6GB of Ram attached to an EMC San with a Fibre attached IBM TS3100 Tape Library.
The Duplicates are ran from B2D folders that sit on the fibre channel drives.
Considering that I get throughput of about 1600 MB/MIN on our old Backupexec system with a SCSI attached Dell 220S disk array and Dell 132T Dual Drive Library,
I'd say the Fibre attached backup system is a disappointment as far as speed.
I guess my question is what speeds should I expect to get and what are others seeing?
Thanks.
