On Mon, Jan 12, 2009 at 9:27 AM, Walter den Besten
<w.denbesten AT nimbuzz DOT com> wrote:
> Happy new year, to start with..
>
> Took some time to get back to the tape problems, is not the only one we are
> having :( (enough to do here..)
>
> But, checked cables, inserted the scsi controller card in an full PCI-X
> slot, and rerun the btape after reconfig to use /dev/nst0..
>
> test command doesn't show any problems.
> Tried fill with multiple tapes, and after about three hours, it ends with
> the following:
>
Hmm. 3 hours is interesting to me. The reason is this is the correct
time to write an entire tape. Also in no way should 86GB take 3 hours.
To me this sounds like the tape or the tape drive is the problem. But
it may also be related to the scsi bus.
>
> 14:20:43 Flush block, write EOF
> Wrote blk_block=1315000, dev_blk_num=3000 VolBytes=84,574,199,808
> rate=8675.2 KB/s
WoW that is slow for LTO!
I would do a dd test with the drive
something like the ones in this thread:
http://www.nabble.com/LTO-4-performance--td17407840.html
> Wrote blk_block=1320000, dev_blk_num=8000 VolBytes=84,896,759,808
> rate=8684.2 KB/s
> Wrote blk_block=1325000, dev_blk_num=13000 VolBytes=85,219,319,808
> rate=8693.2 KB/s
> Wrote blk_block=1330000, dev_blk_num=2500 VolBytes=85,541,879,808
> rate=8696.8 KB/s
> Wrote blk_block=1335000, dev_blk_num=7500 VolBytes=85,864,439,808
> rate=8695.1 KB/s
> Wrote blk_block=1340000, dev_blk_num=12500 VolBytes=86,186,999,808
> rate=8690.0 KB/s
> 14:24:32 Flush block, write EOF
> Wrote blk_block=1345000, dev_blk_num=1000 VolBytes=86,509,559,808
> rate=8677.9 KB/s
> 12-Jan 14:24 btape JobId 0: End of Volume "TestVolume1" at 126:2437 on
> device "TapeStorage" (/dev/nst0). Write of 64512 bytes got -1.
> 12-Jan 14:25 btape JobId 0: Re-read of last block succeeded.
> btape: btape.c:2349 Last block at: 126:2436 this_dev_block_num=2437
> btape: btape.c:2383 End of tape 126:0. VolumeCapacity=86,602,263,552. Write
> rate = 8666.3 KB/s
> 12-Jan 14:25 btape JobId 0: End of medium on Volume "TestVolume1"
> Bytes=86,602,263,552 Blocks=1,342,421 at 12-Jan-2009 14:25.
> Mount blank Volume on device "TapeStorage" (/dev/nst0) and press return when
> ready:
>
>
> So, again about 86 GB on the tape..
>
> After some tape juggling got following message:
> The last block on the second tape matches. Test succeeded.
>
> So test is successful, but not full tape usage as I was hoping for.
>
Are you sure your scsi card is operating in the correct mode and you
are not seeing any more domain validation messages in your dmesg.
John
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