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тАО01-30-2009 08:07 AM
тАО01-30-2009 08:07 AM
NOTE: ioscan shows NO_HW, as it should
#sar -v 3 3
07:50:26 device ~ %busy avwait avserv
07:50:29 c1t2d0 ~ 98.33 0.00 323.57 <--
c1t0d0 ~ 98.33 0.00 2608.15
~
~
07:50:32 c1t2d0 ~ 100.00 0.00 294.84
c1t0d0 ~ 100.00 0.00 3118.64
c2t2d0 ~ 0.33 0.01 6.79
~
~
07:50:35 c1t2d0 ~ 98.33 0.00 294.84
c1t0d0 ~ 98.33 0.00 2562.44
~
~
Average c1t2d0 ~ 101.44 0.00 304.10
Average c1t0d0 ~ 101.44 0.00 2760.54
Solved! Go to Solution.
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тАО01-30-2009 08:13 AM
тАО01-30-2009 08:13 AM
Re: Poor perfromance after breaking and removing mirror root disk???
The Average: %busy on the removed drive is 98.33, await is 0.00 and the avserv is 304.10
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тАО01-30-2009 08:20 AM
тАО01-30-2009 08:20 AM
SolutionHow did you do this? Did you do an 'lvreduce' to reduce the mirrors off of the disk, followed by a 'vgreduce' to get the disk out of the VG?
What does 'vgdisplay -v vg00' show now? What about 'lvdisplay -v /dev/vg00/lvol?' for some of the vg00 lvol's?
If the disk is still showing up in the LV's then that may be the problem.
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тАО01-30-2009 08:27 AM
тАО01-30-2009 08:27 AM
Re: Poor perfromance after breaking and removing mirror root disk???
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тАО01-30-2009 08:51 AM
тАО01-30-2009 08:51 AM
Re: Poor perfromance after breaking and removing mirror root disk???
# vgreduce -f vg00
Will force a reduce of missing PV's out of the VG.
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тАО01-30-2009 10:08 AM
тАО01-30-2009 10:08 AM
Re: Poor perfromance after breaking and removing mirror root disk???
Is the system experiencing any actual performance issues, or are you just concerned about an ugly number on a report?
Could it be that from an HPUX perspective the system is 100% busy waiting for long times for responses which never come as the drive is gonzo?
Also, given a high read activity on VG00, some slowdown should be expected when removing a mirror member. From the "HP-UX Performance Cookbook":
"Sometimes for read-intensive workloads, mirroring can improve performance because reads can be satisfied from the fastest disk in the mirror"
Ergo: un-mirroring can decrease performance.
hth,
Hein van den Heuvel
HvdH Performance Consulting
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тАО01-30-2009 10:17 AM
тАО01-30-2009 10:17 AM