Re: User quotas, large capacity devices, etc.
1996-07-17 16:47:00
Text item: Body.822
Regarding your item 3, you didn't say what your server platform is. For
the S/390 servers, tape robots provide huge capacity. One StorageTek 4400
silo can hold 6,000 cartridges. 16 silos can be cluster together. 256
clusters can be attached to a system. If each cartridge is a 3490 extended
length, then figure 800 meg / cart. Doing all the math give 19,000 T.
All you need is the floorspace and mega$! If you use STK's helical scan
drives, then refigure at 20G / cart. Since IBM now markets STK's dasd, I
am wait for the other shoe to drop and for STK to start bolting 3590's onto
their silos.
_________________________Reply Header_________________________
Author: ADSM-L AT vm.marist DOT edu
Subject: User quotas, large capacity devices, etc.
07-17-96 11:36 AM
Date: Wed, 17 Jul 1996 11:36:21 -0400
From: Andrew Justin Caird <acaird AT engin.umich DOT edu>
Subject: User quotas, large capacity devices, etc.
To: Multiple recipients of list ADSM-L <ADSM-L AT vm.marist DOT edu>
Being fairly new to ADSM and very new to this list, I hope
these questions aren't out of line. I've talked to the
support people, the product information people, and have a
call into the pre-sales group, and have made little
progress on the following questions:
1. Does anyone have any idea when the 2Gb filesystem limit
will be lifted from the HSM client software? In order to
plan for future storage set-ups, this information would
be extremely helpful.
2. Are there any plans for ADSM to support VHS tape
libraries? The word from the support folks is that it
doesn't currently, but it seems like this would be a
logical type for storage device for a product like ADSM
to support.
3. What is currently the largest single storage device that
ADSM supports? We are using optical jukeboxes (IBM3995/163)
each with a capacity of about 173Gb.
4. Has anyone done anything with or are there any plans to
support user-level quotas in the HSM part of ADSM?
Currently the quotas are on a per-filesystem/per-client
basis, but we'd like to impose per user (in the unix
sense of "user") quotas, so Joe can migrate up to 100Gb,
but John can only migrate up to 1Gb.
Thanks in advance for any information/pointers/comments,
etc.
--andrew
Andrew Caird <acaird AT umich DOT edu> PGP encrypted mail encouraged
Andrew Caird <acaird AT umich DOT edu> PGP encrypted mail encouraged
University of Michigan Center for Parallel Computing
(313)936-1985 http://www.engin.umich.edu/center/cpc/
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