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IO Timeout in pvdisplay

 
Hananeel
Occasional Advisor

IO Timeout in pvdisplay

what is the default IO Timeout for a disk in pvdisplay? how to change the default value?

what happens if we can change the IO value? Do we get any performance on Disk level?
5 REPLIES
g3jza
Esteemed Contributor

Re: IO Timeout in pvdisplay

Hi,
this attribute can be tuned with #scsimgr in 11.31. It is called path_fail_secs.

#man scsimgr_esdisk.

g3jza
Esteemed Contributor

Re: IO Timeout in pvdisplay

for example:

scsimgr get_attr -D /dev/rdisk/disk58 -a path_fail_secs

SCSI ATTRIBUTES FOR LUN : /dev/rdisk/disk58

name = path_fail_secs
current = 120
default = 120
saved =

so it should by 120sec by default

Re: IO Timeout in pvdisplay

Default IO timeout on HP-UX is 30 seconds - playing with it is unlilely to change performance - generally you should change it only if advised to do so by your storage vendor.

HTH

Duncan

HTH

Duncan
Hananeel
Occasional Advisor

Re: IO Timeout in pvdisplay

Thanks .. now it is cleared... :-)

Re: IO Timeout in pvdisplay

g3jza,

path_fail_secs is not I think the same thing as the default IO timeout that you see from a pvdisplay command... this is specific to declaring a lunpath as offline... I think the one you were thinking of is probably esd_secs.

If not set seperately via the pvchange command, LVM will inherit the default for the undelying disk subsystem - which is usally 30 seconds on HP-UX

HTH

Duncan

HTH

Duncan