.
Everything Wanda said. We have a 377gb TSM database that mostly runs OK.
(It only acts up when I'm on vacation.) It's on 15,000RPM SSA disks, in
JBOD mode, with TSM mirroring.
But you have to watch expiration closely. Basically, you have to expire
as many objects as you back up, every day. Here are the clues that
expiration gives you.
o Does expiration finish on its own in less than 24 hours? That's good.
If you have to cancel expiration in order to run database backup, that's
bad.
o Is the ratio of deleted to examined objects less than 50%? That's
good. I've seen it over 95% on a database that was in very bad trouble.
Roger Deschner University of Illinois at Chicago rogerd AT uic DOT edu
================ Nothing is ever as simple as it seems.=================
On Thu, 28 Aug 2008, Wanda Prather wrote:
>max size of 534GB.
>
>It depends on how well you can manage your data base with your existing
>hardware:
>.
>-You need to be able to back up the data base in a reasonable period of
>time;
>-You need to be able to run EXPIRE INVENTORY in a reasonable period of time;
>-You need to be able to restore the data base in a reasonable period of
>time, assuming it can take twice as long to restore as to back up.
>
>"reasonable" is whatever is suitable for your site; if you are getting all
>your work done in your 24 hour backup & maintenance window, that's
>reasonable.
>
>However, if you had a problem that would require you to run an AUDIT of the
>DB, consider that people have reported audit times of 12 hours or more for
>DB's around 200 GB.
>
>What is reasonable for a site that backs up 50 clients and is done by 2am,
>may not be reasonable in a site that backs up 700 clients and takes 23 hours
>in a day to complete their maintenance window.
>
>I have seen customers that have difficulty managing a TSM DB over 200GB
>because it is located on old, slow disk. There are other customers that
>easily manage a TSM DB over 300GB because it is located on a high-end disk
>array like a SHARK with lots of cache.
>
>Put the DB on the fastest disk you've got. If you are happy with the time
>it takes to back up, and you could afford to be down twice that long to do
>a DB restore, it's OK.
>
>Also, when you enter Q DB, make sure the DB cache hit rate stays above 98%
>(except during an immediately after a DB backup). If it isn't high, look up
>the TSM server parm for BUFPOOLSIZE in the performance and turning guide and
>adjust that according to instructions; it greatly affects your DB
>performance.
>
>W
>
>
>
>
>On 8/28/08, Patel, Ankur <Ankur.Patel AT au.harveynorman DOT com> wrote:
>>
>> Dinesh,
>>
>> See if this helps.
>> Extract from: http://en.wikipedia.org/wiki/IBM_Tivoli_Storage_Manager
>> ITSM maintains a relational database (limit 534GB through ITSM v5.5) and
>> recovery log (aka transaction log, limit 13.5GB) for logging,
>> configuration, statistical information, and object metadata. DB pages
>> are always 4KB, and partitions every 4MB. Single row inserts only. On
>> average, 20GB of space is consumed for every 25 million objects. Shallow
>> directory structures utilize less TSM DB space than deeper paths. This
>> database may generally be queried via an emulated SQL-98 compliant
>> interface, or through undocumented SHOW, CREATE or DELETE commands.
>>
>>
>> Also, see IBM site:
>> http://www-01.ibm.com/support/docview.wss?rs=0&q1=Maximum+TSM+DB+Size&ui
>> d=swg21243509&loc=en_AU&cs=utf-8&cc=au&lang=en
>> The Administrator Guide manual specifies that the maximum size of the
>> database is 530GB. This is however a rounded figure.The actual maximum
>> size of the database is 543184 MB, which equates to about 530.5 GB.
>>
>>
>>
>>
>> Regards,
>>
>>
>>
>> Ankur Patel
>> TSM Administrator
>>
>>
>> -----Original Message-----
>> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf
>> Of
>> Pahari, Dinesh P
>> Sent: Friday, 29 August 2008 11:37 AM
>> To: ADSM-L AT VM.MARIST DOT EDU
>> Subject: [ADSM-L] TSM database size?
>>
>> Hi All,
>> I have got a TSM server with the 80GB database size. It is already
>> utilized above 80%. Could someone please let me know, what is the exact
>> recommended database size by IBM? Any links with such information would
>> be good.
>>
>> Kind Regards,
>>
>> Dinesh Pahari
>>
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