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тАО10-24-2001 06:46 PM
тАО10-24-2001 06:46 PM
how to tune disk bottleneck of XP256
In our system(N4000-440, 5 cpu, 4G physical memory, HPUX11.0, SAP, Oracle, Fibre channel and XP256 with 4G cache and 384M share memory, all data filesystem are P-VOL of CA, all LDEV are RAID5)has following parameters:
dbc_min_pct = 5
dbc_max_pct = 10
bufpages = 0
nbuf = 0
swapmem_on = 1
When I run glance, the disk utilization is always 100% busy during peak period, %wio is 60.
My questions are:
1. how to tune disk performance?
2. If I incease dbc_max_pct to 15, is it helpful?
Thanks,
dbc_min_pct = 5
dbc_max_pct = 10
bufpages = 0
nbuf = 0
swapmem_on = 1
When I run glance, the disk utilization is always 100% busy during peak period, %wio is 60.
My questions are:
1. how to tune disk performance?
2. If I incease dbc_max_pct to 15, is it helpful?
Thanks,
3 REPLIES 3
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тАО10-24-2001 10:18 PM
тАО10-24-2001 10:18 PM
Re: how to tune disk bottleneck of XP256
Hi,
Before attempting to change any kernel
parameters you probably need to identify
why disk is 100% utilised and which
disk(s) are reporting it. First off try
running 'sar -d 5 5' during this peak or
use glance and select I/O by disk. Then
you will be able to determine what lies
on that disk that could causing a problem.
-Michael
Before attempting to change any kernel
parameters you probably need to identify
why disk is 100% utilised and which
disk(s) are reporting it. First off try
running 'sar -d 5 5' during this peak or
use glance and select I/O by disk. Then
you will be able to determine what lies
on that disk that could causing a problem.
-Michael
Anyone for a Mutiny ?
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тАО10-24-2001 10:47 PM
тАО10-24-2001 10:47 PM
Re: how to tune disk bottleneck of XP256
Hi,
did you check your Oracle buffer hit ratio?? Increasing db_buffers might do wonders.
regards,
Thierry.
did you check your Oracle buffer hit ratio?? Increasing db_buffers might do wonders.
regards,
Thierry.
All unix flavours are exactly the same . . . . . . . . . . for end users anyway.
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тАО10-25-2001 12:24 AM
тАО10-25-2001 12:24 AM
Re: how to tune disk bottleneck of XP256
ooops typo:
db_block_buffers of course
db_block_buffers of course
All unix flavours are exactly the same . . . . . . . . . . for end users anyway.
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