A year ago I found the same problem as Chris and reported it to HP. They
promised that Store's performance would be addressed up but so far nothing.
:(
If you want to drive the DLT7000 at its rated capacity the only product I've
found is Orbit. We choose not to implement Orbit for various reasons, but
it will do the trick. At the time I also tested Roadrunner (now BackPack),
Legato, HighBack, and Veritas and they all had performance similar to
Store's.
Currently, we run our DLT4000's on a dedicated S/E scsi channel and seem to
be able to keep them streaming without much trouble, now. I must admit that
I went through a lot of work to load balance all the i/o and disk on our
systems to make it happen. There is not any way to keep a DLT7000, and by
definition any faster devices, streaming with the current versions on Store.
Let's get some phone calls into the RC and let HP know that this issue needs
to be fixed! And fixed quickly!
Carl McNamee
Systems Administrator
Billing Concepts
(210) 949-7282
-----Original Message-----
From: Chris Goodey [mailto:[log in to unmask]]
Sent: Saturday, December 02, 2000 6:50 PM
To: [log in to unmask]
Subject: Re: [HP3000-L] Disk capacity on an 979KS
I believe you will have trouble getting
more than 5-6 megabytes a second out of Hp's store.
We recently switched to DLT-7000s, with a native speed
of 5mb a second, so should get maybe 10-15 mb a second
with the easily compressible data.
However, the HP staff admits that Store (and Turbo store)
has a bottle neck making it impossible to achieve speeds much
more than 5-6mb/sec.
<big snip>
Do DLT-4000s work well on the 8 bit interfaces, or do
they really need their own dedicated 16bit channel?
Anyone getting much more then 6mb/second on a DLT7000-8000?
If so, how? and what did it cost?
-----Original Message-----
From: Neil Harvey [mailto:[log in to unmask]]
Sent: Friday, December 01, 2000 8:59 PM
To: [log in to unmask]
Subject: Re: [HP3000-L] Disk capacity on an 979KS
From the PDF file (which took a while for me to download) :-
http://www.hp.com/storage/pdf/NETDESK_ULT230.pdf
tape speed 4.1 minutes per second
Yes folks, promising technology indeed!
Neil
-----Original Message-----
From: Neil Harvey [mailto:[log in to unmask]]
Sent: Saturday, December 02, 2000 6:54 AM
To: [log in to unmask]
Subject: Re: Disk capacity on an 979KS
Greetings
Backup is becoming a real issue on our Health Care sites - even on a small
site, capacities run into 80 - 90 GB.
We use DDS3 now, sometimes in parallel, and try to keep backup times down
below 2 - 3 hours, but this becoming unworkable.
With Hardware Compression, we generally get a 3 -1 ratio, so we can fit up
to 36GB on a single media.
I don't think DDS4 is supported on K series boxes (our favourites).
I'm looking for a quantum leap in backup speed.
At HPWorld I saw LTO (Linear Tape Open) drives and media.
From HP's website at http://www.hp.com/tape/ultrium/index.html :-
"The ultra-fast HP SureStore Ultrium 230 stores up to 200 GB* of data on a
single tape at a sustained transfer rate of 30MB/s*. With ultimate
reliability and ease of use in mind, the rugged design builds on the best
existing technologies to create a new level of data protection."
Now, this sounds better - If I can get 3-1 on these babies, I'll have 300 GB
per stick, all within 2 hours. And the technology is at it's very beginning
- so we should expect the same exponential advances as we saw with DDS - 1
through 4.
Question is, are they real, and do they work on K series HP3000's?
Of course, I won't retire until there is Liquid Memory Technology (LMT)
available on tap, and we can just pour data into LMT Vessels :)
Regards
Neil
-----Original Message-----
From: Stan Sieler [mailto:[log in to unmask]]
Sent: Saturday, December 02, 2000 2:03 AM
To: [log in to unmask]
Subject: Re: Disk capacity on an 979KS
Re:
> The Fast Wide SCSI limit is 15 devices per channel,
> although this is not recommended for performance reasons.
> I don't think HP currently supports drives larger than
> the 36GB ones, which would limit you to 540GB per controller.
MPE/iX 6.5 supports 72 GB drives, which (at 15 per channel) would
be 1 TB per controller!
That question about backing it up just got harder :)
> You can add several I/O expanders, with their own card cage,
> and an additional HP-PB expansion, etc. (The HP-PB only goes
> to 32mb a second, so several SCSI channels per PB can keep
> it mighty busy.)
<plug> DiskPerf, from Allegro, could be used to test the
I/O capacity of a system.
</plug>
Stan Sieler [log in to unmask]
www.allegro.com/sieler/wanted/index.html www.allegro.com/sieler
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