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09406 - Tape Drives
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Tape Drives
Hi Andi,say again please - 700 Gb with ONE 3590E in 4,5 hrs??????? This is magic to
us...
We use two 3590E with BRMS to backup our 780 Gb database (14,600 objects) in
parallel mode and it takes about 11 hrs every night!! Even attaching a third
3590E to the system didn't lead to a better runtime.
To get a clue where we have this 40-tons-truck-sized bug in our system (it
must be there!), could you please give me some details.
* Machine type and software release?
* Size of main storage?
* Number of diskarms?
* Scsi or fibre adapter?
* Is your 3590E located in the same room where your iSeries stands (length
of interface cable)?
Thanks in advance,
Franz Lehnardt
AS/400 Administration
Unielektro Fachgrosshandel GmbH & Co. KG
65760 Eschborn, Germany
Tel. +49 (0) 6196 477-360
Fax +49 (0) 6196 477-776
-----Ursprüngliche Nachricht-----
Von: Andi.MerchantZNorthern-foods.co.uk
[mailto:Andi.MerchantZNorthern-Foods.co.uk]
Gesendet: Donnerstag, 20. Februar 2003 13:41
An: 'DoNotReply@consolut.eu'
Betreff: RE: Tape Drives
Hi Doreen,
We use 3590's (E11's currently, looking to upgrade to H11's)
From a personal view I don't like the LTO. Although they do write data
incredibly quickly, the data verification on them isnt a match to a 3590.
Also, the 3590 will recover a lot more data errors before issuing a media
error, where as the LTO will error very quickly... also, looking around, the
Hardware doesn't seem too fantastic from a reliability perspective.
Currently, we use one 3590 to backup 700Gb machine (Save 21 every night),
which takes about 4.5hrs... we are starting to investigate the use of BRMS &
paralleling tape units.
You can go down to object level "spreading" and Im told that the reduction
in backup time to tape units ratio is very linear, ie 2 units will half your
backup time, 4 will quarter it. Only problem I see with this is that the
restore would be very messy if you didn't have the same number of tape units
on your restore box, as you would need to perform a tape change for every
object (somewhere in the region of 15000 on our box)
Sorry to ramble on, just my thoughts
Best regards
Andi
-----Original Message-----
From: Anderson, Doreen [mailto:dandersoZballhort.com]
Sent: 18 February 2003 20:47
To: DoNotReply@consolut.eu
Subject: Tape Drives
Does anyone have experience/comments with the 358x LTO Gen 2 tape
drives? They are supposed to achieve 105MBps at a 3:1 data compaction.
If you do, what model are you running?
Are you also backing up all the Intel/network servers on the floor?
We've used 3590 E11 for a few years and have been very happy - but we're
looking for even fast save times especially since PRD DB is at 420GB
We don't have a large investment of vaulted / archived 3590 media (other
than full system saves) so we are in a position to change the media
Thanks!
Doreen
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