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scsi hard drives

scsi hard drives

Post by Lisa » Mon, 16 Aug 1999 04:00:00



what is the difference between wide and ultra wide hard drives?  can you use an ultra wide controller card if you have a regular wide hard drive?  

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scsi hard drives

Post by paul » Tue, 17 Aug 1999 04:00:00



> what is the difference between wide and ultra wide hard drives?  can
> you use  an ultra wide controller  card  if you have a  regular wide
> hard drive?

Ultra Wide speaks at 40MB/s, Fast Wide at 20MB/s and Wide at 10MB/s,
with 20, 10 and 5 megatransfers/second respectively.

Controllers will negotiate down to the lowest common denominator among
your connected drives so it shouldn't be a problem.

paul

 
 
 
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scsi hard drives

Post by Cowo » Wed, 18 Aug 1999 04:00:00



Quote:>what is the difference between wide and ultra wide hard drives?  can you use an ultra wide controller card if you have a regular wide hard drive?  

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You are meaning fast-wide and ultra-wide, I bet. Roughly speaking fast means
SCSI-2 and Ultra SCSI-3: besides fast use a bus freq of 10 MHZ while ultra uses
20 MHZ, thus doubling bandwidth.
Regular wide hard drive? It's likely to be compatible with Ultra command set,
please take a look at product's datasheet. However, if it's a fast-wide hard
drive it's fully compatible with an ultra wide controller (SCSI standards are
mostly backward compatible)
Giuseppe
 
 
 
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1. Replaced scsi hard drive can no longer find scsi tape drive

My Linux system had a hard disk crash just recently and I had to
replace the hard drive.  I did so and installed a "brand-new" copy of
RH 7.2 on it.  Previously it was running RH 6.2, but since I needed to
catch up a bit, it seemed like now was as good a time as any.....
The system is now up and running.

Now, I would like to restore my backup tapes on to it.  The system has
a HP SCSI DDS-3 tape drive on it, which I have used with tar to keep
backups.

The problem is Linux is no longer "seeing" my tape drive.

So, I look for the device file, and it looks "ok"

And I look to see if the device is known:
Ooops, no tape drive, just a disk.  

Am I missing support in the kernel:
...
Well, the kernel seems to know about scsi tapes.

I also checked the physical connections to the drive and they seem "ok".

I'm not certain what to check next.

Suggestions would be appreciated.

Thanks,
-Chris

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