Re: drive optimisation

From: Bill Wichers <>
Date: Wed, 7 Jan 1998 00:40:01 -0500 (EST)

The UltraWide controller will let you plug in up to 15 devices (although
with fast drives 15 devices can saturate the channel). If you are planning
on running a large cache that will be serving a lot of users UltraWide
SCSI will probably help. If you used 4 4GB drives -- fast drives like
barracudas or Atlases, you'd be nearing the UW channel's limit of 40 MB/s.
Remember that the faster drives now can sustain 7-10 MB/s transfer rates!

My ultimate cache config would be RAID-5 config consisting of 9 GB
Seagate Cheetah drives all talking on a pair of UltraWide SCSI channels.


On Wed, 7 Jan 1998, Alastair Waddell wrote:

> I'd like to hear of experiences people have of drive configurations. Let
> say that this is for the garden variety Linux box with 128MB RAM and a
> P200 processor. Controller is Adaptec Ultrawide.
> I currently have one machine configured with 2*GB (Quantum XP34550W)
> drives. I need to add a 4 meg drive so will partition this to match the
> size of the existing drives making 4 equal partitions for squid.
> Next step will no doubt be the addition of a 9GB drive for which I will
> probably build a RAID0 (md) drive out of the 3 old drives of 8GB total
> size giving me 2 8GB drives.
> My question:
> - Is this a sensible/optimal upgrade path?
> - Should I really be adding another controller, if not now, then at least
> when I put the 9GB or whatever in later?
> Also, what are people's views on the Ultra versus the UW controller - the
> Ultras are a lot cheaper.
> General comments appreciated.
> Regards,
> -----------------------------------------------------------------------
> Alastair Waddell o Tel +61 3 96 400-400
> Technical Administrator o Fax +61 3 9222-1363
> CyberLabs o
> Queen Street, Melbourne
> + Virtual Services + DNS Maintenance + ISP Co-location + Internetworking
Received on Tue Jan 06 1998 - 21:44:41 MST

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