Re: How to calculate a useful size for a given pool

From: Gareth Williams (gareth_at_nospam.com)
Date: 08/02/04 

Date: Mon, 2 Aug 2004 22:16:45 +0000 (UTC)

On Mon, 02 Aug 2004 15:44:27 -0400, Brian Evans wrote:

>> 1. A firm receives 100,000 orders per week as electronic documents.
<snip>
>> 4. Retrieval from CDROM is time-consuming but a limited amount of space is
>> available to cache some of the documents on networked storage for more
>> immediate retrieval. There is not enough space to cache all the documents
>> so the older cached documents are deleted regularly.
<snip>
> #4 mostly likely doesn't hold true anymore.
> Hardrives have increased in capacity making caching all the data easy. A
> single 250gb drive caches 384 CDs worth at 650mb per CD. A fully
> decked out $10,999 Apple XServe RAID would cache 5384 CDs.
> Thats 35/mb of electronic documents per order if 100,000 are
> stored on the XServer at any one time.

I was simplifying the figures for illustrative purposes - in reality,
the volume is very much bigger. Sure, we could throw lots of storage at
the issue, but I am grappling with the problem of what would be the most
sensible amount of storage without having to cache everything for an
over-long period of time. Having said that, a rough calculation shows that
an XServe would hold over 100 days' worth of documents, which may be quite
adequate. I just want to make sure, though. Thanks for the Apple tip, by
the way - sounds a steal at that price. 

-- 
Regards, Gareth Williams

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