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WE are running 16 4gig and 5 8gig drives all the the system ASP.  The 4gig
drive are busier than the 8gig drive but transfering less data.  The 4gig
are also 5400rpm while the 8gig I believe are 7200rpm.  So it depends on the
data transfer rate as well as the size.  Our AS400 has all the drive at the
same percentage used.  Data is fairly evenly distributed.  I would say look
at the data transfer rates and divide by size.  A drive that is 3 times
faster and holds twice the data does not work as hard as two smaller drives
have to.

Christopher K. Bipes      mailto:ChrisB@Cross-Check.com
Operations & Network Mgr  mailto:Chris_Bipes@Yahoo.com
CrossCheck, Inc.                  http://www.cross-check.com
6119 State Farm Drive     Phone: 707 586-0551 x 1102
Rohnert Park CA  94928    Fax: 707 586-1884

-----Original Message-----
From: Chuck Morehead [mailto:cbmorehead@nokuse.com]
Sent: Wednesday, May 16, 2001 2:46 PM
To: MIDRANGE-L@midrange.com
Subject: Re: 17 GB Disk Drives


Phil,

In my experience I have found that smaller drives (such as 8GB) perform
better in highly interactive environments, while the larger drives (such as
17GB) perform better in more batch oriented environments.  For example, I
have had better luck with the 17 GB drives in data warehousing applications.
Of course the 17 GB drives are more economical, especially if it means that
you don't have to purchase an expansion unit.  I do not have experience with
a mixture of drives of substantially different sizes (e.g. 4GB and 17GB).

Chuck

----- Original Message -----
From: <prumschlag@phdinc.com>
To: <MIDRANGE-L@midrange.com>
Sent: Wednesday, May 16, 2001 3:51 PM
Subject: 17 GB Disk Drives


>
>
> Does anyone have any experience with the 17 GB disk drives?  Are there
> performance issues compared to using more drives with smaller capacity?
Are
> there load balancing (% Used as well as % Busy) issues if you mix 4GB /
8GB / 17
> GB drives on the same box?  What if you keep the different types in
separate
> ASP's?
>
> If there are documents or guidelines in this area, I have not been able to
> locate them.
>
> Phil
>
>
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