A HP979 comes with 2 full sized expansion slots,
as needed for the SCSI interfaces.
It can optionally be expanded to include 2 more in the
main card cage (HP989s can hold more cpus, so can NOT
have this expansion.)
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.)
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.
The XP48 and XP256 systems are probably a good choice for
very large disc systems. I see on the advertisements that
the XP48 supports to 3.5TB.
MPE 6.5 supports up to 511 spindles, assuming you can
put enough interfaces to address that many. The processor
spec sheet lits 9x9 systems as support 24,021GB of disc,
but no mention of how (maybe with XP256 systems?)
The XP48 or XP256 route is expensive, but would work
with newer, faster HP3000s since it supports very fast
discs with ultra-SCSI, etc.
Once you get this much disc, how do you back it up?
I can only get about 5mb/second out of the Store program
to DLT-7000 drives, which require dedicated controllers.
-----Original Message-----
From: Joseph Rosenblatt [mailto:[log in to unmask]]
Sent: Friday, December 01, 2000 8:55 AM
To: [log in to unmask]
Subject: Re: [HP3000-L] Disk capacity on an 979KS
I am not an expert but here is what I know.
* A 979 has 4 F/W SCSI slots. I know you can get an "add on I/O cage." I
think this will give you an additional 4 slots.
* When I was dealing with EMC they recommended that we not put more than 8
devices on a channel.
* This would then mean 64 devices not actual LDEVS. I think this includes
all the devices in the RAID ARRAY. (I may be wrong on this)
* How much capacity each drive has is your call. Obviously there is a limit
but we used 18 gb drives split into 4 4.2 gb drives.
* With the Symetrix systems you have a lot of options that you don't have
with MPE (at least not with MPE 5.5.) Among these are full raid on LDEV 1.
I hope this helps.
-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf
Of Proudfoot, Bill
Sent: Friday, December 01, 2000 10:40 AM
To: [log in to unmask]
Subject: [HP3000-L] Disk capacity on an 979KS
Anyone aware of an upper limit on the total disk capacity that can be
attached to a 979-300,
these would probably be EMC3930's
Bill
> * +44 (0)151-235-3055
Fax: +44 (0)151-235-3151
> * mailto:[log in to unmask]
>
>
>
>
>
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