RE: 1 Volume of Software RAID 1+0 versus Multiple Volumes of Soft

Yes - and I just completed stress-testing an OLTP database where we went from 2 distinct 'filesystems' for data files to 12 separate filesystems. Average wait times for I/O dropped from 40 - 50 msec (yes 40 - 50 msec!) to about 10 - 13 msec. All this was on an Disk Array and all we did was to convince the SAs to chop it up this way. Apparently, some software layers at the Array level that 'combined' LUNs to make it look like a large filesystem was also disabled.  

John Kanagaraj
Oracle Applications DBA
DBSoft Inc
(W): 408-970-7002

What would you see if you were allowed to look back at your life at the end of your journey in this earth?

• The opinions and statements above are entirely my own and not those of my employer or clients **

-----Original Message-----
Sent: Tuesday, October 29, 2002 5:19 PM
To: Multiple recipients of list ORACLE-L Software Raid

Ah yes. The eternal argument between the DBA, who likes things separate, and the SA, who likes big smears (But it's mirrored!). ----- Original Message -----
To: "Multiple recipients of list ORACLE-L" < <mailto:ORACLE-L_at_fatcity.com> ORACLE-L_at_fatcity.com>
Sent: Tuesday, October 29, 2002 3:43 PM
Software Raid

> I would go with 3 RAID 1's given the choice.
>
> Not necessarily for performance though.
>
> This would allow you to have 3 control files on separate drives.
>
> It would also allow soft mirroring of the redo logs.
>
> And before someone jumps in with "But you don't need
> to mirror them on RAID 1", I *like* having them in 2 locations. :)
>
> As for performance, it is nice to separate the redo as much as possible.
>
>
> Jared
>
>
>
>
>
>
> "VIVEK_SHARMA" < <mailto:VIVEK_SHARMA_at_infosys.com>
VIVEK_SHARMA_at_infosys.com>
> Sent by: <mailto:root_at_fatcity.com> root_at_fatcity.com
> 07/11/2002 06:43 AM
> Please respond to ORACLE-L
>
>
> To: Multiple recipients of list ORACLE-L
< <mailto:ORACLE-L_at_fatcity.com> ORACLE-L_at_fatcity.com>
> cc:
> Subject: 1 Volume of Software RAID 1+0 versus Multiple
Volumes of Software Raid 1
> ?
>
>
>
> For performance , Which Option is better :-
>
> Given 6 Internal FCAL Hard Disks ?
> 1) Creating 1 Volume with Software RAID 1+0 OR
> 2) Creating 3 Volumes of Software RAID 1 , Each Volume Containing 2 Disks
> & Manually Spreading the Database
> across the 3 Volumes ?
>
> Solaris 8
> Machine V880 model
>
> --
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> Author: VIVEK_SHARMA
> INET: <mailto:VIVEK_SHARMA_at_infosys.com> VIVEK_SHARMA_at_infosys.com
>
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-- 
Author: John Kanagaraj
  INET: john.kanagaraj_at_hds.com

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