I got several responses from all of you. Thanks to all of you. Specially,
Kevin Buterbaugh, Pesach Goldman, and John Malick.
Eventually, it comes to RAM.,and it's allocation.
1. I take away RAM from Sybase, and give it back to OS. That seems to
be working ok, because my Swap is not kicking often.
2. Increase amount of RAM in future.
3. If SWAP kicks off often, then I will have to separate Rootdisk form
Swap. by adding another swap
4. Use "truss" commands to find out what most of the Sybase and my
application process is doing.
Thanks for help. I used lots of sar options to get the results.
If anyone wants more info, feel free to contact me.
Dilip
-----Original Message-----
From: Raj, Dilip (SD-EX) [mailto:DRaj@gi.com]
Sent: Thursday, December 14, 2000 8:53 PM
To: Sunmanagers (E-mail)
Subject: Performance on root disk
Hi,
I am using Solaris 2.51, running VxFS, and VxVM, Sun Cluster 2.1, and
Sybase.
We have a encapsulated root. My rootvol, and swapvol is coming from one disk
( c0t0d0s2), and mirror is coming from disk ( c4t4d0s2).
Total RAM: 1 GB
Allocated to Sybase: 750MB
Rest of the RAM 250 MB ( Goes to OS)
When I monitor my Disk I/O, the The Average Service time (svc_t) on my
root-disk and Mirror-root disk is very high. Occational spikes are OK, but
sometimes svc_t column reaches at 70-80.
Also, the %b ( Percentage of the time disk is Busy) for both this disk
drives are roughly 65%.
Both of them are 9.1 GB, disks with 7K RPM
Here is the sample output for ( iostat 5) and (sar -d)
disk r/s w/s Kr/s Kw/s wait actv svc_t %w %b tin tout us sy wt
id
ssd0 3.7 3.1 31.2 100.9 0.2 0.3 68.7 1 8
ssd11 3.7 3.1 31.9 100.2 0.1 0.3 64.3 1 7
Outout of sar -d
ssd0 2 0.3 2 52 61.9 74.2
ssd1 7 0.1 11 148 0.0 9.1
ssd2 1 0.0 1 8 0.0 9.5
ssd4 0 0.0 0 0 0.0 7.0
ssd5 1 0.0 1 6 0.0 15.9
ssd6 2 0.0 2 13 0.0 12.7
ssd7 1 0.0 4 136 0.0 5.5
ssd8 5 0.1 11 263 0.0 5.5
ssd9 4 0.1 11 259 0.0 5.0
ssd10 1 0.0 1 3 0.0 9.8
ssd11 2 0.3 2 52 56.9 69.4
Is there anything I can do to reduce the (svc_t) and (%b) value. System is
real slow
Should I replace this disks with 10K RPM Disks.
Please help.
Thanks
----------------------------
Dilip Raj
System Administrator.
Access Control Center.
Motorola Broadband Communication Sector.
Phone: (858)-404-3878
mailto:draj@gi.com
----------------------------
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