El Domingo 9 de febrero de 2014 19:12, "Prather, Wanda"
<wanda.prat...@icfi.com> escribió:
Del, you are a national treasure!
You are very kind to take time to respond.
My backups are already very well balanced, I have 2 servers, the DBA's have the
DBs split between them so well that they backup almost the same amount of data,
and finish within 30 minutes of each other.
(3.7 TB each, takes 10 hours on a 10G network, direct to LTO5 tape, with
/SKIPINTEGRITYCHECK specified. Exchange DBs coming from V7000 disk so should
be spiffy speed there.).
I tried setting resourceutilization 10 once before, was an impressive failure.
The backup appeared to be looping doing VSS snaps (or rather failing to); I
think it was doing as you mentioned in 2 below, trying to snap the same LUN
multiple times.
Will go through the references you included, then open a performance PMR if no
improvement.
Thank you so much!
W
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Del
Hoobler
Sent: Friday, February 07, 2014 6:48 PM
To: ADSM-L@VM.MARIST.EDU
Subject: Re: [ADSM-L] Exchange 2010 backup performance
Hi Wanda,
I have a few ideas for you...
--------------------------
Are you running in a DAG environment? If so, you could do some load balancing
between DAG Servers:
Most of this in the Exchange book under "Managing Exchange Database
Availability Group members by using a single policy":
http://pic.dhe.ibm.com/infocenter/tsminfo/v6r4/index.jsp?topic=%2Fcom.ibm.itsm.mail.exc.doc%2Ft_dpfcm_bup_reduce_redundant_exc.html
The key to "load balance" when setting up the scheduled backup script is to
have a separate invocation of each database. For example:
TDPEXCC BACKUP DB1 FULL /MINIMUMBACKUPINTERVAL=720 /PREFERDAGPASSIVE TDPEXCC
BACKUP DB2 FULL /MINIMUMBACKUPINTERVAL=720 /PREFERDAGPASSIVE TDPEXCC BACKUP DB3
FULL /MINIMUMBACKUPINTERVAL=720 /PREFERDAGPASSIVE TDPEXCC BACKUP DB4 FULL
/MINIMUMBACKUPINTERVAL=720 /PREFERDAGPASSIVE TDPEXCC BACKUP DB5 FULL
/MINIMUMBACKUPINTERVAL=720 /PREFERDAGPASSIVE
Then, run this command from each of the Exchange servers at or about the same
time.
--------------------------
Here are a few more things to look at:
To help with some performance issues, some customers have split their backups
into multiple "threads" or "processes" in two ways:
1. Increase the value of the RESOURCEUTILIZATION parameter in the
DSM.OPT file for the DSMAGENT. Trying setting this to "10".
Important: This needs to the DSM.OPT file for the DSMAGENT
not the DP/Exchange options file.
2. Split the backups into multiple parallel instances of the
TDPEXCC backup execution.
i.e. the create separate invocations of DP/Exchange that back
up a different set of databases. For example:
TDPEXCC BACKUP db1,db2,db3,db4 FULL
TDPEXCC BACKUP db5,db6,db7,db8 FULL
TDPEXCC BACKUP db9,db10,db11,db12 FULL
Put these in separate command files and stagger the
launching of them by 10 minutes or so.
The key here is that you need to make sure that you don't
have any LUNs that appears in more than one invocation.
In other words, you don't want to snapshot the
same LUN in separate invocations.
Note: The integrity check is a Microsoft tool. IBM has no control over the
speed of that tool. DP/Exchange invokes the Microsoft ESEUTIL program to
perform the integrity check. It's a very I/O intensive program that must
examine every page of the database file (.EDB) and all log files.
--------------------------
If none of these help, you should open a PMR to get the performance team to
look at your environment.
Thank you,
Del
----------------------------------------------------
"ADSM: Dist Stor Manager" <ADSM-L@vm.marist.edu> wrote on 02/07/2014
06:04:01 PM:
> From: "Prather, Wanda" <wanda.prat...@icfi.com>
> To: ADSM-L@vm.marist.edu,
> Date: 02/07/2014 06:06 PM
> Subject: Exchange 2010 backup performance Sent by: "ADSM: Dist Stor
> Manager" <ADSM-L@vm.marist.edu>
>
> Are Exchange 2010 VSS backups affected by TXNBYTELIMIT settings in the
> baclient dsm.opt?
> Or is there anything else I can tweak to improve TSM throughput of a
> 2010 full backup?
> Got a 10G network, but Exchange full backup performance not impressive.
>
> Thanks for any ideas - links to relevant doc also appreciated!
>
> Wanda
>
>
> **Please note new office phone:
> Wanda Prather | Senior Technical Specialist |
> wanda.prat...@icfi.com
|
> www.icfi.com<http://www.icfi.com> | 410-868-4872 (m) ICF International
> | 7125 Thomas Edison Dr., Suite 100, Columbia, Md
> |443-718-4900 (o)
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