RE: UPS & Tape Drive

[rob@xxxxxxxxx]

1)  Label all of your tapes with a different volume id.
2)  Run this to reset your figures:
     PRTERRLOG TYPE(*VOLSTAT) +
               VOLTYPE(3580) +
               VOLSTAT(*DLT)
3)  Add the command from step 2 to the end of your backup.
Does this help?

Sample from our system, (3590 instead of 3580, but I think it generates 
the same report because both 3590's and 3580's are on the report):
Title . . . . . . . . . . :   Volume Statistics Report
System type . . . . . . . :   9406
System model  . . . . . . :   840
System release  . . . . . :   V5R2M0
System name . . . . . . . :   GDIHQ
System serial number  . . :   10-3BD4M
Report type . . . . . . . :   Lifetime Report
Removable media . . . . . :   Self-configured tape and 1/4 inch cartridge 
tape
Volume          ---Temporary Errors---   --------K Bytes--------
ID                    Read       Write         Read      Written
3FRI21                   0          18           23     48978721
3FRI11                   0          12           32     52770571
4FRI1                    0           0           56    114890836
4FRI2                    0           0           58    125937505
4FRI3                    0           0           52    114124753
4FRI4                    0           0           52    112985461
4FRI5                    0           0           34     73269506
6FRI1                    0           0           56    114596248
6FRI2                    0           0           55    119812393
6FRI3                    0           0           54    116376877
6FRI4                    0           0           52    113274001
6FRI5                    0           0           40     86509838
>> indicates media replacement is recommended
> indicates media replacement criteria should be checked

I didn't include them all.  The first two are 3590's.  The rest are 
3580's.  The 3580's are saving Tivoli Storage Manager data, which is 
already highly compressed as it sits on disk.  The TSM data is all in a 
library called PCBACKUP.  Summing up the size of all objects in PCBACKUP 
comes to 1,117,712,404kb.  Summing up the 3580 save bytes above adds up to 
1,091,777,418kb.  A difference of 25,934,986kb or 26gb. 
25,934,986/1,117,712,404 = 2% compression.  Like I said, that TSM data is 
already pretty compressed.

We use two 3580's:  TAP04, TAP06.  We store the names of all the objects 
in PCBACKUP, sorted by size descending, into a data queue and the two tape 
drives take turns processing that data queue for objects to save.  This is 
why 4FRI5 and 6FRI5 have less then their previous tapes - they were the 
last tape in the sequence.


Rob Berendt
-- 
Group Dekko Services, LLC
Dept 01.073
PO Box 2000
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





"Jones, John (US)" <John.Jones@xxxxxxxxxxxxxxxxxxxxxxx> 
Sent by: midrange-l-bounces@xxxxxxxxxxxx
03/08/2004 08:55 AM
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Subject
RE: UPS & Tape Drive






We bought two 3580-H23s for each of systems, a our 730-2067 (4-way) & a
830-2400 (2-way) last summer.  Ultrium2, 200GB native, etc. as everyone
else has said.  I bench-tested the backup speed on both systems and got
70GB/hour on the 730 and 203GB/hour on the 830.  The machines are
comparable in CPW (2000 & 1850 respective) but the PCI-type bus made a
world of difference.

The saves were performed on non-dedicated but fairly idle systems, so
the numbers could fluctuate a little.  The save was of our JDE data
libraries and not the entire system.  Throughput is somewhat less when
saving the entire system, but it's still way faster than the drives they
replaced.  Also, we are currently getting the entire system save on a
single tape with room to spare.

H23s are all that can be attached to an SPD box like our 730.  The
reason we went with H23s vs. L23s on the 830 was that the LVD tape
controller required V5R2 and we just weren't ready to make that jump yet
as we had app issues holding us back.

A quick question for other LTO2 users:  How much data have you gotten on
the tapes before it asks for volume 2 of a save?  IOW are you getting
the normal advertised 2-1 compression or something different?  On our
old BCC AIT drives we would always get about 3.8-1 overall and I'm
wondering if I can expect the same from the LTO2s (760ish GB/tape
compressed).
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