[Sunhelp] Performance increase w/scsi ?

[Rita]

----- Original Message -----
From: "Fuerst, Robert C. (Chris)" <robert.fuerst at sylvania.com>
To: <sunhelp at sunhelp.org>
Sent: Saturday, April 22, 2000 3:32 AM
Subject: RE: [Sunhelp] Performance increase w/scsi ?


> I didn't think anyone used 5400 rpm drives anymore.  Here's one from
> Seagate.....
>
> The newer Barracuda 18LP or Cheetah 18LP would be the most appropriate for
> the Sun systems you have, since both drives will work on standard Wide
SCSI
> interfaces.
> You probably cannot install the newer Ultra160 SCSI compatibility in your
> system unless you have at least one PCI available in each system, and that
> host adapter card you choose features driver support for your version(s)
of
> Solaris.  The Barracuda and Cheetah models currently shipping only support
> Ultra2 Wide SCSI, which has a maximum bandwidth of 80 Meg/sec.  Therefore,
> they could not every reach data rates about 80 Meg/sec.
> The newer and unreleased Barracuda 18XL and Cheetah 18XL/36LP will support
> Ultra160 out of the box, but these drives will not be available until
> sometime in the first quarter of next year.
> The "LW" suffix of our models now indicates the 80 Meg/sec data rate, but
> the LW suffix will also be used on the newer drives to indicate 160
Meg/sec.
> To differentiate, you would need the exact model number of the drive and
> then check the actual specifications to find out if the model supports 80,
> 160, or both.  The older "W" interface was 40 Meg/sec burst rate, but
those
> drives are no longer made in favor of the "LW" drives being backward
> compatible to that architecture and burst speed.
> If you use current drives on an older Fast Wide (20 Meg/sec) interface,
you
> will still reap all the benefits of the lower seek times, the RPM, and
other
> attributes of the 10,000 RPM Cheetah rives, but the data rate of the drive
> will suffer since the interface will limit the drive to a maximum rate of
20
> Meg/sec.  You would have to upgrade the host adapter or SCSI controller
> subsystem in your machines in order to fully realize the speed potential
of
> newer and faster drives.  In any case, any current drive will most
certainly
> outperform the older ST19171W drive you currently have.
> Brian W.
> Seagate Technical Support
>
>
> -----Original Message-----
> From: Bill Bradford [SMTP:mrbill at mrbill.net]
> Sent: Friday, April 21, 2000 1:13 AM
> To: sunhelp at sunhelp.org
> Subject: [Sunhelp] Performance increase w/scsi ?
>
> I'm thinking of switching my Ultra 10 (which currently has the old 4500rpm
> 4.5gig IDE HD and 24x IDE CD-ROM drive in it) so that its SCSI-based (12x
> Plextor CD-ROM drive, Seagate Barracuda 5400rpm 4gig HD).  Anybody know
what
> kind of speedup improvements I'll see?
>
> Even tho this U10 has 300mhz/512k, this HD *definitely* slows it down - it
> seems slower than my U5/270mhz that had a 8.4gig Seagate HD in it (5400rpm
> I beleive).  Can definitely tell the difference.
>
> Bill (still looking for a 24bit card..)
>
> --
> +--------------------+-------------------+
> |   Bill Bradford    |   Austin, Texas   |
> +--------------------+-------------------+
> | mrbill at sunhelp.org | mrbill at mrbill.net |
> +--------------------+-------------------+
> _______________________________________________
> SunHELP maillist  -  SunHELP at sunhelp.org
> http://www.sunhelp.org/mailman/listinfo/sunhelp
> _______________________________________________
> SunHELP maillist  -  SunHELP at sunhelp.org
> http://www.sunhelp.org/mailman/listinfo/sunhelp