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Need assistance with Ultrium 448 performance issue.

Tony_281
Occasional Contributor

Need assistance with Ultrium 448 performance issue.

I got a DL380 G3 server with 3HDD's configured for RAID5. Further more there is an internal DAT72 hotplug (Q1529A) tape drive in this server.

Due to increased storage demands, I recently installed an Ultrium 448 internal drive in a 1U rackmount kit, and a single channel U320 SCSI adapter into the server.

Software used for backup is Backup Exec V10 and the ultrium drive seems to work OK.

However, when running L&TT V4.5 software to test funtionality & performance, it reports the following:

"There are indications that the drive is experiencing a high polling rate on the SCSI Interface"

Estimated native data rate (last 2 tapes) : 7.7 MB/s (104 GB written, 1.2 MB read)
Previous tape (2130408878) : 8.4 MB/s (33.1 GB written, 0 KB read)
Previous tape (2240171542) : 7.3 MB/s (71.2 GB written, 1.2 MB read)
Specified max native data rate : 24 MB/sec.

I'll be greatful if someone can assist me in solving this issue to get this drive performing optimally.
Thanks in advance.
1 REPLY
TapeDrive Killer
Trusted Contributor

Re: Need assistance with Ultrium 448 performance issue.

Hi Tony sorry for replying late, The high polling rate is from RSM and performance could be many reasons check this links out.

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg50460

http://support.microsoft.com/kb/842411/en
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