I/O latency

RD · Joined: 06 Aug 2007 Posts: 2

I recently read an article
http://www.winnetmag.com/MicrosoftExchangeOutlook/Article/A
rticleID/42629 which says that Exchange does support the
Geoclustering technology. It also writes that Exchange
doesn't recognize the physical design of the underlying
cluster. If the cluster works (e.g., if it has acceptable
latency and I/O policies), Exchange will work. Etc...

I believe same logic applies to slow disk subsystem too. I
recenlty had problem when I misconfigured an IBM raid and
my loadsim client for Exchange 2003 were showing high
latency. There are mirroring product in the markets too.

So my question to Microsoft Exchange folks or any exchange
experts is -- what is the acceptable I/O speed for
Exchange 2000/3 servers? Where can I find such
specification?

Thanks

Archived from group: microsoft>public>exchange2000>clustering

Evan Dodds [MSFT] · Joined: 05 Aug 2007 Posts: 21

RD -

Acceptable I/O numbers will be very heavily dependent on your mailbox-user
profile (ie - light, heavy, etc) and how many users you intend to support on
the server. You will likely have the best success by profiling your users to
determine the sort of load you can expect and then building a
server/disk-subsystem to meet this requirement. Alternately, if you can
determine the maximum I/O numbers you can get out of a disk subsystem,
knowing the I/O requirements of an average mailbox in your environment will
help you to determine the maximum mailboxes to place on this server. See the
Exchange Performance and Scalability guide at
http://www.microsoft.com/exchange/library/ for more suggestions.

--
Evan Dodds
Microsoft Exchange Support

****** Disclaimer ******
This posting is provided "AS IS" with no warranties, and confers no rights.

Note: Please do not reply to this e-mail address. It is used for newsgroup
purposes only.

"RD" wrote in message$3097a2c0$a401280a@phx.gbl...
> I recently read an article
> http://www.winnetmag.com/MicrosoftExchangeOutlook/Article/A
> rticleID/42629 which says that Exchange does support the
> Geoclustering technology. It also writes that Exchange
> doesn't recognize the physical design of the underlying
> cluster. If the cluster works (e.g., if it has acceptable
> latency and I/O policies), Exchange will work. Etc...
>
> I believe same logic applies to slow disk subsystem too. I
> recenlty had problem when I misconfigured an IBM raid and
> my loadsim client for Exchange 2003 were showing high
> latency. There are mirroring product in the markets too.
>
> So my question to Microsoft Exchange folks or any exchange
> experts is -- what is the acceptable I/O speed for
> Exchange 2000/3 servers? Where can I find such
> specification?
>
> Thanks

RD · Joined: 06 Aug 2007 Posts: 2

Thanks Evan,

Does that mean Exchange would work no matter how slow the
disk subsystem is and only the effect will be on
performance and scalability of the exchange server?
What kind of role the I/O latency play if log files and
DBs are on seperate NTFS volume?

RD
>-----Original Message-----
>RD -
>
>Acceptable I/O numbers will be very heavily dependent on
your mailbox-user
>profile (ie - light, heavy, etc) and how many users you
intend to support on
>the server. You will likely have the best success by
profiling your users to
>determine the sort of load you can expect and then
building a
>server/disk-subsystem to meet this requirement.
Alternately, if you can
>determine the maximum I/O numbers you can get out of a
disk subsystem,
>knowing the I/O requirements of an average mailbox in
your environment will
>help you to determine the maximum mailboxes to place on
this server. See the
>Exchange Performance and Scalability guide at
>http://www.microsoft.com/exchange/library/ for more
suggestions.
>
>--
>Evan Dodds
>Microsoft Exchange Support
>
>****** Disclaimer ******
>This posting is provided "AS IS" with no warranties, and
confers no rights.
>
>Note: Please do not reply to this e-mail address. It is
used for newsgroup
>purposes only.
>
>"RD" wrote in
message
>$3097a2c0$a401280a@phx.gbl...
>> I recently read an article
>>
http://www.winnetmag.com/MicrosoftExchangeOutlook/Article/
A
>> rticleID/42629 which says that Exchange does support
the
>> Geoclustering technology. It also writes that Exchange
>> doesn't recognize the physical design of the underlying
>> cluster. If the cluster works (e.g., if it has
acceptable
>> latency and I/O policies), Exchange will work. Etc...
>>
>> I believe same logic applies to slow disk subsystem
too. I
>> recenlty had problem when I misconfigured an IBM raid
and
>> my loadsim client for Exchange 2003 were showing high
>> latency. There are mirroring product in the markets
too.
>>
>> So my question to Microsoft Exchange folks or any
exchange
>> experts is -- what is the acceptable I/O speed for
>> Exchange 2000/3 servers? Where can I find such
>> specification?
>>
>> Thanks
>
>
>.
>

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