SCSI Drives

TheCactusKid Cactus thecactuskid45 at yahoo.com
Fri Mar 12 10:05:48 EST 2004


Hi Dave,
Thanks for the info I vary much appreciated it. 
I've been reading: The Book of SCSI 
A Guide for Adventures. By Peter M. Ridge
Published by No Starch Press. Distributed by Publishers Group West. First publish date was 1995 last 1999.
ISBN: 1-886411-02-6 Cost: $34.95 Its a little dated but it has all the info I need for the dated hardware I'm using anyway. I bought it through eBay and won it for .49 cents plus S/H  No CD but plenty of information and resources to info and software from the Internet. So with it and the help from the Lug I surely will get the system (s) up and running. 
 
Say did you catch the post about how Meany Admin's it takes to screw in a lightbulb. Funny as all heck. Ya see a lot of that on the usenet.
 
Thanks, tHecActUsKid:) 

Dave Andruczyk <djandruczyk at yahoo.com> wrote:

> Ok...Thanks..I see my errors and will change the syntax, also I may
> chop down the /tmp and add more to a /? is there such a thing as
> /storage. If I do the following.
> 
> sdb0 2gig /var sdb1 1gig /tmp sdb2 1gig /? (storage) maybe this
> sounds better. What partition name is used for a storage partition? 
> 

Names are pretty much arbritrary, you can use whatever suits you. I
personally use /scratch, but whatever floats your boat will do.

> I also thought of the following changes.
> 
> sda /swap sdb0 2gig /var sdb1 1gig /tmp 
> 
> sdb2 1gig /(storage ?) sdc0 2gig /opt sdc1 2gig /usr/local
> 
> sdd0 4gig /home sde0 50mb /boot sde1 200mb / 
> 
> sde2 3750mb /usr 
> 

sounds fine, you may find later down the road that some of the
partitions were NOT big enough, but that depends on a lot on what you
install, (i.e. with gentoo, /usr/local is nearly empty, but /usr is
pretty full, and var gets lots of use with gentoo, but not as much
with a rpm based distro..) HAving a scratch partition handy is great
if you want to repartition as you'll have a place to back things up to
if you ever decide to restructure...


> So how does this line-up sound? sde is the newest drive and the bus
> ends with the cd-rom.

Just make sure that the SCSI bus is terminated properly. Most drives
these days are Ultra-wide (or Ultra2/3) (68 pin mini connector), and
CDroms use a 50 pin connector. Adapters are available, but do NOT use
termination on the CDrom as its a narrow device and won't terminate the
full scsi bus, you need a terminate plugged into the end of the
cable..

Another concern, if your SCSI drives are LVD (Ultra2 or faster) and
you plug in a CDrom (Single Ended (SE)device) the entire scsi bus will
slow to SE speeds (Ultra-Wide 40MB/sec (for wide devices) and 20MB/sec
for narrow devices.

Its best to place the SE devices on one SCSI bus and LVD devices on
another scsi bus if at all possible, if you don't the LVD devices will
slow down to SE speeds. (I do this at home as I have a symbios logic
53c1010 Dual Channel Ultra3 controller with 3 old Ultra2 drives on 1
channel, and my SCSI burner on the other channel)




=====
Dave J. Andruczyk

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