filer gurus --
got a question about tape drive performance, when directly attached to the filer (via SCSI).
We have an F825 (soon to upgraded, we hope !) to which we've attached both an LTO-2 and LTO-3 8-tape library unit (these are from Dell, just FYI). The LTO-3 is a recent acquisition, and so we thought we'd run a few tests, to confirm that the LTO-3 drive is "faster". Well, it isn't - at least doesn't appear to be, based on an overnight full backup of the filer.
Now, I know there are a lot of things to watch out for when making tests like this, but I though I'd check with the group here to see if anyone knows...
- is there a way to tell what the data rate to the tape drive is from the filer, over the SCSI bus ? I'm looking for more of an instantaneous measurement, rather than the overall average of (amount of data moved / time it took).
- anyone else played around with this (ie, attempting to measure the data throughput from filer to SCSI attached tape drive) ? If so, what did you try, and what conclusions did you reach ?
Thanks much for your replies and time !
John