Question

faster reads raid 10 vs raid 5

Asked by: FTGE

What is a faster read for a 2005 sql server provided the hardware is all the same.

raid 5 to read databases using 3 disks vs
raid 10 using 4 disks.

i am setting up an sql server and want the fastest reads to recall data

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Asked On
2009-11-03 at 21:43:21ID24869867
Topics

Computer Servers

,

SQL Server 2005

Participating Experts
3
Points
250
Comments
3

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Answers

 

by: rrjegan17Posted on 2009-11-03 at 21:52:54ID: 25736742

 

by: dlethePosted on 2009-11-03 at 21:53:35ID: 25736743

One can configure either one to outperform the other, even if disks are all same make/model.   A rule of thumb would say that a 3disk RAID 5 would be expected to be faster on reads, but that is not always the case, especially if the RAID10 was configured with too large of a stripe size.

If you are just looking for a good generic rule for SQL, then you are better off with 2 x RAID1 then a single RAID10, especially if there are no other disks for the computer to boot from.

 

by: tsgiannisPosted on 2009-11-03 at 22:00:20ID: 25736765

You can't go wrong with RAID 10 .
But remember that RAID 10 is just for the Data Section of SQL
The Full Recommendation for SQL is
A raid1 setup just for your OS
A Raid 1 for the Logs (yes it seems like a waste of space but this is what Microsoft Recommends)
A raid 10 for the DATA.
Also because this is a SQL server is better to install just the OS and SQL and nothing else.
This configuration is used for our SQL server and yes its lightning fast

20120131-EE-VQP-002

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