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Title: Message
I think the point of this thread may have been lost.
(also should it even be on this list?)
If anyone has adapters in the works in the said price
range please speak up, otherwise I think we are digressing it discussion of
semantics on the one side and possible configurations on the
other.
-Shawn
I did not
read any of my statements talking about using local disks. Do you ?
What we created is a diskless environment for
a regular software stack (Linux and Windows).
Julo
| Robert Snively
<rsnively@Brocade.COM>
15/04/03 18:34
|
|
To
| Julian
Satran/Haifa/IBM@IBMIL, Sukanta ganguly
<sganguly@yahoo.com>
|
|
cc
| ips@ece.cmu.edu,
owner-ips@ece.cmu.edu, Robert Snively
<rsnively@Brocade.COM>, Russell
Lewis/Tucson/IBM@IBMUS
|
|
Subject
| RE: Are there any
coming iSCSI HBAs? Preferably at 100Mb
speed? |
|
What you have described is not a diskless environment.
It is a disk-full environment
with local disks, a well supported and very cheap environment that
receives
no benefit from iSCSI
and is frequently implemented with traditional SCSI or
ATA and will soon be implemented with
SATA.
If you create the local iSCSI home target, you still have not provided
the diskless
environment to the
legacy hosts you intend to attach to that target. If you have
more
than one such host, you
must introduce non-legacy software and management tools.
In most cases, you could have just attached your
$500 brick directly and saved
yourself the cost (and hassle of managing) the extra Linux PC
target.
It looks to me like we still have some confusion interpreting Russell's
original intent.
Bob
-----Original
Message-----
From: Julian Satran
[mailto:Julian_Satran@il.ibm.com]
Sent: Monday, April 14, 2003 10:50
PM
To: Sukanta ganguly
Cc: ips@ece.cmu.edu;
owner-ips@ece.cmu.edu; Robert Snively; 'Russell Lewis'
Subject: RE:
Are there any coming iSCSI HBAs? Preferably at 100Mb
speed?
We did run "informal"
tests using Windows/Office+Personal-Web-server (a usual home/SOHO setup) on
switched 100Mb/s (also common at home).
The disks we attached to where
better than the ordinary desktop IDE drives (we where using the now defunct
200i - but I have seen an inexpensive small array (looks like a larger brick
two weeks ago at Fry's for $500 - if you put those behind a (not very old) PC
running Linux you can have a decent and inexpensive home target). Webserver
and Office where showing better numbers - and the perceived response
time on clients was better.
Julo
| Sukanta ganguly
<sganguly@yahoo.com>
15/04/03 05:23
|
|
To
| Julian
Satran/Haifa/IBM@IBMIL, Robert Snively
<rsnively@Brocade.COM>
|
|
cc
| ips@ece.cmu.edu,
owner-ips@ece.cmu.edu, Russell Lewis/Tucson/IBM@IBMUS
|
|
Subject
| RE: Are there any
coming iSCSI HBAs? Preferably at 100Mb
speed? |
|
Hi,
For a diskless
environment multiple other issues
have to come into play, i.e Network based
remote boot
logic, proper downlod of enough Operating System code
onto
the diskless box etc.
Julo, what kinds of numbers did you folks
see ?
What is your environment like ? I am a little
perplexed with the
high speed connection to the remote
disks via
iSCSI.
Thanks
SG
--- Julian Satran
<Julian_Satran@il.ibm.com> wrote:
> Bob,
>
> I wonder
if your opinion is based on real experience
> or prejudice.
> Our
measurements indicate that an inexpensive box
> with SCSI disks performs
> BETTER than an IDE (typical) desktop drive
> using iSCSI over a
100MB/s connection (widely
> available for home use) -
> and that
includes paging (usually marginal) and all
> the rest.
>
>
Julo
>
>
>
> Robert
Snively <rsnively@Brocade.COM>
> Sent by:
owner-ips@ece.cmu.edu
> 14/04/03 18:06
>
> To
>
Russell Lewis/Tucson/IBM@IBMUS, ips@ece.cmu.edu
> cc
>
>
Subject
> RE: Are there any coming iSCSI HBAs? Preferably
at
> 100Mb speed?
>
>
>
>
>
>
> My experience with diskless workstations is that
> they are
limited by paging activity and background
> updating to really
unacceptable performance, even in
>
> simple word-processing
programs like frame maker
> doing medium sized books, and even on a
local 10
> Mb/s
> network.
> You are far better off
running a workstation with
> a local disk for system and swap, but
running
> dataless. NFS or comparable networking programs
> run fine for that. The local caching of the files
> on
disk and in memory assure adequate performance,
> while
> the
maintenance of your data remotely assures
> appropriate centralized
data management and backup.
> Remember too, that it is a rare broadband
connection
>
> that gives you anything approaching 100 Mb/s.
A T1
> DSL link
> is specified at 1.54 Mb/s, and it is the
fastest of
> the
> common broadband links.
> In addition,
there is nothing more frustrating than
> being
> unable to
operate because your link is down or
> severely
> congested,
something that happens far more often
> than the
> unavailability
of a local disk.
> My view? iSCSI is not an appropriate protocol
for
> home
> networking data access. Use your IDE or SATA
drive
> locally
> for boot, swap, system, and any hot programs
and use
>
> NFS or other remote file access program against
a
> remote
> server for data and other programs.
> Bob
Snively
> 408-333-8135
> rsnively@brocade.com
> >
-----Original Message-----
> > From: Russell Lewis
[mailto:russelll@us.ibm.com]
> > Sent: Friday, April 11, 2003 9:25
AM
> > To: ips@ece.cmu.edu
> > Subject: Are there any
coming iSCSI HBAs?
> Preferably at 100Mb speed?
> >
>
>
> >
> >
> >
> >
> >
Does anybody know of any current or coming iSCSI
> HBAs which
>
> show up (to the
> > BIOS) as ordinary SCSI adapters? I'd
like to drop
> such an HBA into a
> > legacy computer and run
a totally diskless
> workstation at home.
> >
> >
However, since it will be a home computer, I'm
> willing to
>
> operate at 100Mb
> > speed - I'm willing to eat the performance
hit.
> It seems to me that
> > somebody could make an iSCSI
HBA with a 100Mb
> interface and make it
> > affordable for
the home user (say, $50-$100).
> Anybody know
> > of such
plans?
> >
> >
>
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Last updated: Wed Apr 16 01:19:17 2003
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