Performance on root disk
2007-12-24 18:59:00
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 at gi.com
----------------------------
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