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тАО02-26-2006 11:46 PM
тАО02-26-2006 11:46 PM
PV Timeout value
Is it possible to get the default pv timeout value from the sdisk driver. When using pvdisplay the output indicates that IO Timeout is set to default.....But no indication what the default value is?
Furthermore anybody knows if there is special need for pv timeout settings in an EMC SRDF metrocluster environment, other than the 90 seconds EMC recommends.
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тАО02-27-2006 02:02 AM
тАО02-27-2006 02:02 AM
Re: PV Timeout value
I dont think you will find the value when you see "default", it is specific to the drivers...For sdisk driver (most commonly used), the default timeout is 30 seconds.
About your second question I dont know since I have no EMC but with HDS you can also tune the Queue Depth parameter...
All the best
Victor
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тАО02-27-2006 02:13 AM
тАО02-27-2006 02:13 AM
Re: PV Timeout value
But it is logged by the driver into the kernel.
Varies from device to device.
I've seen as high as 180 for NetApp and as low as 30 for an EMC DMX.
And, no, take the EMC recommendation of 90 - they know better than anyone else.
My $0.02,
Jeff
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тАО02-27-2006 10:33 PM
тАО02-27-2006 10:33 PM
Re: PV Timeout value
But how did you find out that the default value is 30 seconds?
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тАО02-28-2006 02:08 AM
тАО02-28-2006 02:08 AM
Re: PV Timeout value
I am not sure how to find out the default PV Timeout value.
As regards your 2nd Question, it all depends on what kind of I/Os are being generated on your SAN and whether you are getting frequent error messages in your syslog file related to PVs .
rgds..Ashish
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тАО03-01-2006 01:39 AM
тАО03-01-2006 01:39 AM
Re: PV Timeout value
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тАО03-01-2006 09:19 PM
тАО03-01-2006 09:19 PM
Re: PV Timeout value
PV I/O time out range can not be modified.