RE: Tuning in VXFS & Quick I/O

From: VIVEK_SHARMA <VIVEK_SHARMA_at_infy.com>
Date: Thu, 21 Jun 2001 02:35:02 -0700
Message-ID: <F001.00331597.20010621022036@fatcity.com>

Your point Taken . Will Check with Higher Stripe Size Whenever possible .

NOT Using Parallel Query Option (PQO) in the Application

Thanks again

> -----Original Message-----
> From: Kevin.Little_at_blueshieldca.com
> [SMTP:Kevin.Little_at_blueshieldca.com]
> Sent: Thursday, June 21, 2001 4:41 AM
> To: VIVEK_SHARMA
> Subject: RE: Tuning in VXFS & Quick I/O
>
> I'm running Veritas but not Quick I/O (420R 4 CPUs, 4GB RAM, A-1000
> array
> with HW RAID 10). As I understand, Quick I/O tunes like 'RAW', so the
> main
> advantage is for write intensive files such as REDO logs and TEMP
> tablespace.
>
> I think also you may be able to benefit from a block size larger than
> 8K.
> Though likely this will disproportionately benefit batch/analytic
> reports
> and have little effect on true OLTP transactions.
>
> Personally, I think 64K is a small stripe size. Fine grain striping
> improves single user/light load performance at some expense in
> scalability.
> To avoid taking a hit under heavier load, I like to start with
> something a
> little higher like 256K or 512K, which doesn't perform much better at
> light
> load than at moderate load so users see nearly the same response times
> regardless of system load variations.
>
> Are you using parallel query option?
>
> Kevin
>
> > -----Original Message-----
> > From: VIVEK_SHARMA [SMTP:VIVEK_SHARMA_at_infy.com]
> > Sent: Wednesday, June 20, 2001 6:32 AM
> > To: LazyDBA.com Discussion
> > Subject: Tuning in VXFS & Quick I/O
> >
> > AIM - Performance Tuning on O.S. & Veritas
> >
> > SETUP -
> > DB Server :-
> > E3500 m/c = 2 CPUs , 2 GB RAM
> > Solaris 8 on ORA 8.1.7.1
> > Database on VXFS Filesystem with Quick I/O Installed .
> > RAID 0 with 64 K Stripe Size using VXVM & 8 K VXFS Block Size
> > Software RAID Configured as H/W RAID NOT Supported by the A5200
> Storage
> > Box.
> > db_block_size=8 K
 

Benchmarking Run Done on a Banking Application . 5000 Transactions Distributed Between 200 Concurrent User Processes are Executed
Transactions' Mix = OLTP & Batch Runs in the ratio 70:30 percent respectively

/etc/vfstab :-

/dev/vx/dsk/rootdg/vol01        /dev/vx/rdsk/rootdg/vol01       /in1/db1
vxfs    3       yes     mincache=direct,convosync=direct
/dev/vx/dsk/rootdg/vol02        /dev/vx/rdsk/rootdg/vol02       /in1/db2
vxfs    3       yes     mincache=direct,convosync=direct
/dev/vx/dsk/rootdg/vol03        /dev/vx/rdsk/rootdg/vol03       /in1/db3
vxfs    3       yes     mincache=direct,convosync=direct

/etc/vx/tunefs :-
/dev/vx/dsk/rootdg/vol01 qio_cache_enable=1

/dev/vx/dsk/rootdg/vol02 qio_cache_enable=1 /dev/vx/dsk/rootdg/vol03 qio_cache_enable=1

Qs. What Parameters Can be additionally Set on the O.S. & Veritas to Give a performance Benefit

Qs. Should the Tempfiles Also be Converted to Quick I/O (QIO) & Thereafter De-Sparsed ?

NOTE - After Converting the Existing Database's Files to Quick I/O (Running mkqio.sh) , NO performance benefit was Observed between the NON-QIO & QIO Converted Database in the Benchmark Runs .

Upon Setting the parameters mincache=direct,convosync=direct in /etc/vfstab & qio_cache_enable=1 in /etc/vx/tunefstab Files for the VXFS Filesyatems Containing the Database , Some Business Types of Transactions promarily Batch in Nature Improved Distinctly Though the OLTP Trans, Types Continued to perform at the Same Rate

>

--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: VIVEK_SHARMA
  INET: VIVEK_SHARMA_at_infy.com

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Received on Thu Jun 21 2001 - 04:35:02 CDT