It is possible that the sites and servies are imporperly configured...
Are there any best practices or resources on configuring Sites and Serives
with Exchange?
Travis
"Bingham, Kevin" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
You've been talking about local and remote DC sites... is this a
reference simply to physical location, or does your Active Directory
Sites and Services topology reflect it, as well?
-----Original Message-----
From: Steve Szabo [mailto:[EMAIL PROTECTED]
Sent: Monday, November 03, 2008 12:12 AM
To: MS-Exchange Admin Issues
Subject: RE: Exchange performance
I'm about to head off to bed again--had to get up and restart a couple
of
servers at client sites after updates were applied, so I'm not looking
it
up, but you should be able to set a default DC for Exchange to talk
with. Do
that, if one is not already set, for one of the DC's local to the
Exchange
server. Then you can concentrate on that one server to determine why it
may
be getting long reply times, if they still exist.
Also check to make sure all the DC's listed actually exist. I remember
one
case that one of the other guys had where a DC crashed hard and was
replaced
using a different name, and Exchange was still looking for the original
server.
\\Steve//
-----Original Message-----
From: Travis Krampy [mailto:[EMAIL PROTECTED]
Sent: Sunday, November 02, 2008 7:10 PM
To: MS-Exchange Admin Issues
Subject: Re: Exchange performance
Here is something interesting, i ran the troubleshooting tool again and
now
it was trying to connect to 12 remote DC's for the LDAP test...
Travis
"Steve Szabo" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
Is your Exchange looking at a local domain controller, or is it
looking to
one of the remote domain controllers? I'd probably check that first,
because
if it is going through a small pipe with a lot of traffic, that could
be
part of your delay for the lookup.
\\Steve//
-----Original Message-----
From: Travis Krampy [mailto:[EMAIL PROTECTED]
Sent: Sunday, November 02, 2008 5:39 PM
To: MS-Exchange Admin Issues
Subject: Re: Exchange performance
This place has 61 Domain controllers.
2 at the main site (which is where this exchange server that I am
working
on
is located)
and 1-2 DC's per remote location (40 some remote locations)
Each remote location is connected via 128K line or smaller.
As why they are so busy, i have no idea, ill have to look and see
why...my
guess is too much replication traffic, but thats just a guess right
now
Travis
"Michael B. Smith" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
I think you need to worry about your LDAP performance first. That's
crappy
LDAP response time. How many DCs do you have and why are they so
busy?
Regards,
Michael B. Smith, MCITP:SA,EMA/MCSE/Exchange MVP
My blog: http://TheEssentialExchange.com/blogs/michael
Link with me at: http://www.linkedin.com/in/theessentialexchange
-----Original Message-----
From: Travis Krampy [mailto:[EMAIL PROTECTED]
Sent: Sunday, November 02, 2008 3:12 PM
To: MS-Exchange Admin Issues
Subject: Re: Exchange performance
Thanks! I am going to take Simon's advise and just move mailboxes
into
new
mailstores. I am also going to utilize Exchange Ent and maximize the
SG's
As for performance, i have run the troubleshooting tool...
Here is what i found (Note that this was run on the weekend and not
during
the weekday):
Performance issue found on logical disk containing database files
Database disk: The maximum value for '\LogicalDisk(J:)\Avg. Disk
sec/Read'
should be less than 0.05 (50 ms). The measured value is 0.054 (54
ms).
Maximum 'MSExchangeDSAccess Domain
Controllers(Domaincontroller.domain.com)\LDAP Read Time' is beyond
the
warning threshold of 100 ms. The measured value is 258 ms. The rate
of
reads
to this domain controller is 1 calls per second, indicating the
active
directory server is used infrequently. Rates below 0.5 are considered
low.
Maximum 'MSExchangeDSAccess Domain
Controllers(Domaincontroller.domain.com)\LDAP Search Time' is beyond
the
warning threshold of 100 ms. The measured value is 219 ms. The rate
of
searches to this domain controller is 1 calls per second, indicating
the
active directory server is used infrequently. Rates below 0.5 are
considered
low.
Active RPC User Activity
Since the RPC operations per second per user is greater than 0.15,
the
users
are considered as 'moderately active'. The measured RPC operations
per
second/per user rate is 0.217.
The tool also gave me a recommendation to:
If the users accessing the Exchange server are highly active, and you
are
unable to reduce the load on your server, and your server is
exhibiting
bottlenecks, you should consider moving some users to another server.
Looks like I have some more digging...
I never had to deal with RPC latiency issues, can anyone point me to
a
direction to start looking? Obviously i need to take care of the
disk
bottleneck, but could the disk bottleneck be an indication that the
SAN
isnt
configured properly for Exchange?
I dont deal much with SANs, only direct attached storage for
exchange...
Thanks
Travis
"Troy Meyer" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
I agree with Simon (as will most of the other Exch admins here) that
if
you
can just move the mailboxes to a different mailstore, its not worth
doing
the offline defrag. You get essentially the same result when you are
able
to delete the original mailstore.
Your speed symptoms sound strange, is it with everyone, or just
select
users? I would look at mailboxes to make sure you don't have users
with
tons of data and a million things in the inbox. If you can help it,
keep
mailbox sizes under 2gb and less than 5000 items in a single folder
(IE
move
extra items to a subfolder). If you allow excess (as we do) just let
users
know its their call and they need to know performance will suffer.
Also,
how are your users connecting? Is everyone local MAPI? If you have
humongous mailboxes, cached mode should help improve performance a
bit.
Hope that helps
Troy
-----Original Message-----
From: Simon Butler [mailto:[EMAIL PROTECTED]
Sent: Saturday, November 01, 2008 9:28 AM
To: MS-Exchange Admin Issues
Subject: RE: Exchange performance
Have you run the Exchange Troubleshooting tool on the server?
How do you know you will gain 50% of the space on an offline defrag?
You are prepared for the downtime? 100gb stores, that is between 4
days
and
24 hours total downtime (the rough rule of thumb is 1 - 4gb per hour
for
an
offline defrag).
As you are running Enterprise edition and have not maximised out the
number
of storage groups, I wouldn't even be considering an offline defrag.
Create
some new databases and move the mailboxes, then drop the original
store.
I will leave it to others to post on the SAN performance issues.
However, I will say that I have seen performance gains by REMOVING
RAM. I
get funny looks when I do that, but I have removed 2gb from 4gb
machines
and
seen performance gains in the past.
Simon.
--
Simon Butler
MVP: Exchange, MCSE
Amset IT Solutions Ltd.
e: [EMAIL PROTECTED]
w: www.amset.co.uk
w: www.amset.info
Need cheap certificates for Exchange, compatible with Windows Mobile
5.0?
http://CertificatesForExchange.com/ for certificates from just
$23.99.
Need a domain for your certificate? http://DomainsForExchange.net/
-----Original Message-----
From: Travis Krampy [mailto:[EMAIL PROTECTED]
Sent: 01 November 2008 16:13
To: MS-Exchange Admin Issues
Subject: Exchange performance
Hi All,
I have been assigned to look at some performance issues on an
exchange
server.
Exchange 2003 Ent, SP2, Windows 2003 SP2
4Gb RAM, 1 dual core processor, 2-36Gb hard drives (OS) RAID1, 2-72Gb
Hard
drives (Pagefies, SMTP) RAID1
Databases and Tranaction logs on SAN
8 different Databases, 2 Storage Groups (4 databases in each storage
group)
8-RAID5 LUNS (200Gb each) all on the same set of spindels, one for
each
DB,
and 2 RAID1 LUNS for the transaction logs (200Gb each, all on the
same
spindels)
The exchange server is connected to the san using Fiber Channel
The performance issues that are being experienced are mostly Outlook
issues
Changing from Inbox to Calendar is about a 10 second pause
sometimes clicking on a message will take about 5 seconds to
display
properly in the reading pane
moving from folders takes a few seconds for outlook to respond
I am in the process of scheduleing some defrags on the databases.
Each
database is either at or nearing the 100Gb mark. I have calculated
that
I
can get the databases down to about 50% or less.
I am not confident that doing these defrags will imporve performance.
Given all of this information, what else can I do or look at to
improve
performance?
Could my SAN be a part of the performance problem that the users are
experiencing?
How could I find out if my SAN is part of the problem?
Thanks
Travis
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