Forum Discussion
Hi,
how exactly are you measuring the GB/h?
Theoretically a LTO9 tape has a maximum native rate of 160-180 GB/h
and LTO5 should be somewhere at 60 GB/h
Things that can improve transfer rates on tape
1. cache to reduce "shoeshining" - to have a consistent stream of data
2. Multiplexing to write to tape with more than one job
3. HW compression
4. Check everything else - drivers / connection / throughput of source system etc.
- cian10 months agoLevel 3
Counting the number of bytes shown as written by the duplication job, and dividing by the time since the job was assigned a drive. Crude but when trying to look for large variation it gives enough info.
Those figures for throughput seem on the low side compared to both HPEs specs and what we were getting - HPE claim 1.44TB/hr for LTO9, 504GB/hr for LTO5 - and we were getting 200GB/hr per single LTO5 drive, uncompressed but encrypted
I would presume I would see wait messages within a duplication job if there was a problem with data being provided (as I used to get when we were running at the maximum read performance of the MSA2040 kit). HW compression and encryption don't generally work together I thought?
Related Content
- 2 years ago