[THIN] Re: Starting it all over
- From: Henry Sieff <hsieff@xxxxxxxxxxxx>
- To: "'thin@xxxxxxxxxxxxx'" <thin@xxxxxxxxxxxxx>
- Date: Fri, 19 Nov 2004 12:19:29 -0600
If you boot of a SAN, you can set your page file on a local HDD if you like.
The LUN on a SAN is just a SCSI LUN from the OS's standpoint.
As far as speed, that depends.
Today, 2 Gbps raw speed is offered by most FIbre Channel vendors. However,
you need to look at the overall architecture to judge:
If you have a disk array with a single 2 Gbps connected to an FC switch via
a single connection, then your total aggregate throughput will be 2 Gbps
(although caching will improve this - if you have a 4 GB cache, you might
only hit the disk subsystem 20% of the time, say).
I wouldn't use a SAN for booting and paging, though - the contention for
that total throughput is a risk with any shared storage medium, and tracking
it for data driven apps is hard enough without having to also monitor total
page file usage and its cheap enough to drop a single local HDD in a server
to do the paging. You could do it, but you need to be sure about the total
throughput which will be eaten up by paging operations across all servers
hitting a given storage array.
Henry
> -----Original Message-----
> From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx]On
> Behalf Of Bernd Harzog
> Sent: Friday, November 19, 2004 11:26 AM
> To: thin@xxxxxxxxxxxxx
> Subject: [THIN] Re: Starting it all over
>
>
> Guys,
>
> I have a question (which I admit is rooted in my not knowing
> much about
> SAN's). If you boot a server off of a SAN, where does that
> server's page
> file reside? If it is on the SAN, then what is the access speed of SAN
> storage relative to leading edge IDE and SCSI access? The
> reason for the
> question was that I had a talk recently with an architect of
> Microsoft's
> internal TS farm, and he was very against booting servers off
> of the SAN,
> since SAN speeds were far below those of local hard disks in
> the server (he
> was actually looking a using solid state hard drives for the
> page files).
>
> Thanks,
>
> Bernd Harzog
> CEO
> Applications Performance Management Experts
> www.apmexperts.com
> bernd.harzog@xxxxxxxxxxxxxx
>
> -----Original Message-----
> From: thin-bounce@xxxxxxxxxxxxx
[mailto:thin-bounce@xxxxxxxxxxxxx] On
Behalf Of Ron Oglesby
Sent: Friday, November 19, 2004 11:42 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Starting it all over
Greg you can hit me offline, but in addition to some of that I would
look at throwing some Vmware in there from the start.
Ron Oglesby
Senior Technical Architect
Microsoft MVP, Windows Server
RapidApp, Chicago
Office 312.372.7188
Mobile 815.325.7618
email roglesby@xxxxxxxxxxxx
-----Original Message-----
From: Greg Reese [mailto:gareese@xxxxxxxxx]
Sent: Friday, November 19, 2004 9:54 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Starting it all over
If you had to throw out your entire server setup and start over, would
you do differently a second time around.
We have undergone recent changes here and I pretty much get to do that
after the first of the year. Exchange, SQL, Firewall, Citrix, Windows
servers, the whole entire datacenter - gone. It all has to be redone
from scratch and it has to be done with an eye on future growth.
I was thinking of moving it all to blades that boot from a SAN. It's
all standalone servers now.
I'm just curious what the rest of you have run into that you wish you
could do differently if given the chance.
Greg
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