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Gyto
Posting Yak Master

144 Posts
Posted - 07/18/2012 :  11:53:23  Show Profile  Reply with Quote
Hi there,

I assume the preference for clusters is to have the tempdb on it's own dedicated physical disk, but if there are not enough actual disks in the SAN to make this possible, would there be any performance benefit to split an existing RAID group into 2 LUNs and use one solely for the tempdb?

E.g. A single RAID 10 set split as follows:

LUN 1 - Userdb MDFs - 950gb
LUN 2 - tempdb data & logs - 50gb

Something like that....any ideas?

Thanks,

Matt

chadmat
The Chadinator

USA
1954 Posts
Posted - 08/03/2012 :  17:03:18  Show Profile  Visit chadmat's Homepage  Reply with Quote
Obviously this is workload dependant, but 50GB seems like it might be a little small for 950GB of data.

-Chad
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sql-lover
Yak Posting Veteran

54 Posts
Posted - 08/22/2012 :  22:09:47  Show Profile  Reply with Quote
If tempdb and data will be on same RAID channel , I see no performance improvement.

But something is for sure,don't mix data and Tlog,if you can. Tlogs should be on its own channel always, due Its sequencial IO reading pattern.
Edited by - sql-lover on 08/22/2012 22:10:37
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jackv
Flowing Fount of Yak Knowledge

United Kingdom
1769 Posts
Posted - 08/23/2012 :  01:32:50  Show Profile  Visit jackv's Homepage  Reply with Quote
Even having tlogs on separates IO channels is not a guarantee of high performance. There are sitauations where you can have multiple transaction logs from many databases - which if busy enough can simulate a random read. Keep an eye on IO write\reads delays. Also, report on LDF \ MDF locations - http://www.sqlserver-dba.com/2012/08/sql-server-manage-sql-data-and-sql-log-file-locations.html

Jack Vamvas
--------------------
http://www.sqlserver-dba.com
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