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тАО10-26-2005 08:14 AM
тАО10-26-2005 08:14 AM
HP-UX 11.23 swap memory and tuning
4 CPUs, 24 GB of RAM. swapinfo -tam shows the following:
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED dev 4096 1757 2339 43% 0 - 1 /dev/vg00/lvol2
dev 12000 1753 10247 15% 0 - 1 /dev/vg00/swap2
reserve - 12586 -12586
memory 24559 20145 4414 82%
total 40655 36241 4414 89% - 0 -
Total is 89%.
I added 12GB of swap after we got the box 3 months ago.
kctune dbc_min_pct=2
kctune dbc_max_pct=5
sar -b shows %r at 83% and w% at 68%.
Should I just add swap? What else should I look at?
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тАО10-26-2005 09:07 AM
тАО10-26-2005 09:07 AM
Re: HP-UX 11.23 swap memory and tuning
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тАО10-27-2005 08:32 AM
тАО10-27-2005 08:32 AM
Re: HP-UX 11.23 swap memory and tuning
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тАО10-27-2005 08:33 AM
тАО10-27-2005 08:33 AM
Re: HP-UX 11.23 swap memory and tuning
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тАО10-27-2005 08:40 AM
тАО10-27-2005 08:40 AM
Re: HP-UX 11.23 swap memory and tuning
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тАО10-27-2005 11:33 PM
тАО10-27-2005 11:33 PM
Re: HP-UX 11.23 swap memory and tuning
In any event -- your swap is certainly fairly full (reservation wise). As to why specific Oracle requests are failing the lazy swap reservation, I really couldn't say without knowing the machine state at that time. Certainly, looking at the data you've presented -- 4Gb seems a reasonable buffer left, but for all I know Oracle is trying to shmat a 6Gb shared memory segment with lock-on-shmat properties.
In the short term - adding more swap will alleviate your immediate problem until your workload grows to consume your virtual address space again. On 11.23, you can go up to 32Gb of swap without touching a tunable. Higher than that and you'll need to set swchunk higher than the default. (man (5) swchunk).
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тАО10-27-2005 11:54 PM
тАО10-27-2005 11:54 PM
Re: HP-UX 11.23 swap memory and tuning
What does following say??
glance -m
vmstat 1 5
Do you see any pageouts??
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тАО10-28-2005 12:16 AM
тАО10-28-2005 12:16 AM
Re: HP-UX 11.23 swap memory and tuning
Keep in mind that HP generally recommends 2x RAM worth of device swap. Although at high levels of memory you can sometimes start with 1.5X and work your way up.
So if you are running with 24 GB of RAM, I would start with a minimum of 36 GB of device swap and work your way up from there.
Oz
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тАО10-28-2005 12:44 AM
тАО10-28-2005 12:44 AM
Re: HP-UX 11.23 swap memory and tuning
More swchunk info here:
http://docs.hp.com/en/939/KCParms/KCparam.SwChunk.html
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тАО10-28-2005 01:02 AM
тАО10-28-2005 01:02 AM
Re: HP-UX 11.23 swap memory and tuning
Regards,
Trond