Re: LTO, import data

Tom,

I am importing in the other direction and seeing some wierdness also.  I am
importing DLT to LTO.

Since "import" appears to be a streaming application, you would expect to
see full drive speed.  Instead, my 8 MB/s DLT drives feed data to TSM at
2.5 to 3.5 MB/s.  Even if the incoming file is very large so there is
almost no DB overhead.  And my DLT library is on a dedicated PCI bus.

I have no idea why imports are running as slow as they do.

Tab Trepagnier
TSM Administrator
Laitram Corporation







Tom Tann{s <tom.tannas AT USIT.UIO DOT NO>@VM.MARIST.EDU> on 12/13/2001 05:43:12
PM

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Subject:  LTO, import data


Hello tsm'ers.

Has anyone using these drives tried to do a import node?

I have HP Ultrium drives, LVD-connected to a S7A, AIX.
TSM is 4.2.1.7.

When running an import from these drives I only get aroung 200KB/s, until
after some time the drive/scsi-bus/controller will give up.

Repeated tests on the same data/tape/drive result in the same, but the
amount of data imported could vary from some KB to several GB before the
crash.

All other operations to/from the drives work fine. Streaming, they are
really fast. Not streaming, not that good..., but that's not the issue
here, I hope.

I had a PMR opened on this two months ago, but nothing happens..

Has anyone using the IBM LTO-drives/Atapedriver had some experience in
importing data?

Any hints from LTO-users, IBM,HP or whatever, would be appreceated.

                            Tom