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DLT80 Performance Problem

KEITH LARGE
Occasional Advisor

DLT80 Performance Problem

I have recently upgraded the Firmware on a DLT80 from V025 to V080. Performance has now
deteriorated. The SCSI Adapter used ia an Adaptec AHA-2940 UUW using the latest Driver and Firmware. Windows NT 4 is being used with Backup Exec Version 7.3.

Any ideas why performance should have dropped
by 50% ?
4 REPLIES
Leif Halvarsson_2
Honored Contributor

Re: DLT80 Performance Problem

Hi

Has hardware compression been switched off.
KEITH LARGE
Occasional Advisor

Re: DLT80 Performance Problem

No ! Hardware compression is still switched on
David Ruska
Honored Contributor

Re: DLT80 Performance Problem

In our testing of recent DLT8000 firmware releases, we did note a increased sensitivity to small block sizes, where the drive had a harder time maintaining streaming.

What block size are you using?

The recommended block size is 32K or better.
The journey IS the reward.
KEITH LARGE
Occasional Advisor

Re: DLT80 Performance Problem

The block size is set in Veritas Backup Software at the default of 32K. The Buffer size is also set at the default which is also 32K. I will increase to 64K and see if this makes any difference