MSL4048 performance

[Ender Wiggin]

Hi there i have just bought 4 new MSL4048 with 2 LTO-4, according with:

http://h10010.www1.hp.com/wwpc/us/en/en/WF06a/12169-304612-304622-304622-304622-1842552.html

it is supposed that they can back up 2.3 TB/hr. (max i've reached up to now is about 600 Gb/hr using both drives of any librarie.

Anyone who has experienced something like this?

[Andres_13 · Accepted solution]

Hi, Could be thousands of things, pls provide more info:

SCSI cable or SAN attached?
Backup software?
OS being backed up?

Pls revert.

[Ender Wiggin]

Tks for your quick response Andres. All of them are SAN attached, Data Protector 6.0 is tha backup software (HP-UX 11.11 cell server, all clients 11.23) and i thing this is not a hardware issue because it seems to have the same performance of a MSL6060 with LTO-3 tape drives.

[Andres_13]

Do you have the lastest patches for all DP components you are currently using? If not this is a good start.

[Ender Wiggin]

Cell server and clients fully patched....

[Andres_13]

It's dificult to give one step solution and also i think this is not a libraries problem. You might want to test your hardware using LTT and based on the result of such test we can try other options. Just a thought i suspect this is an IO performance issue.

[Ender Wiggin]

Ok let me test. From where i can download LTT?

[Andres_13]

LTT download:

http://h20000.www2.hp.com/bizsupport/TechSupport/DriverDownload.jsp?pnameOID=406731&locale=en_US&taskId=135&prodSeriesId=406729&prodTypeId=12169

There you can choose your OS, download, install an use it.

[Ender Wiggin]

Thanks, tomorrow will return with the test results!!

[Tom O'Toole]

One thing you may be able to try is an LTT devperf and sysperf test... They are supposed to isolate the tape and the disk subsystem performance, respectively. I'm not sure how accurate it is, but you should be getting a performance improvement from fibre attached lto4 drives, unless your disk subsystem can't drive it - 600Gb/hour is a lot to push.