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09-30-2009 06:31 AM
09-30-2009 06:31 AM
11iv2 LVM/disk timeout
Hi,
When creating a PV, the IO Timeout value is set to default which imply that LVM will rely on the underlying device driver (disk)timeout.
I have found this link that states that for versions prior to 11iv3, there is no timeout with disk driver.
http://h21007.www2.hp.com/portal/site/dspp/menuitem.863c3e4cbcdc3f3515b49c108973a801?ciid=c108771e35f02110771e35f02110275d6e10RCRD, unless devices are opened with NO_DELAY which will make 45 retries before blacklisting the device.
I cannot find wether LVM opens the PV's with NO_DELAY (lsof +fg /dev/[r]dsk/cxtydz doesn't show anything).
Is there some HP-UX internals things someone could point me to to get clear answers ?
In clear, if NO_DELAY is used, what is the timeout after which the system will decide to iterate the retries (up to 45 ones), or if NO_DELAY is not used, will the system hang undefinitely waiting for IO ack.
This last option doesn't seem to be true as the PV goes stale in reality.....
Thanks
When creating a PV, the IO Timeout value is set to default which imply that LVM will rely on the underlying device driver (disk)timeout.
I have found this link that states that for versions prior to 11iv3, there is no timeout with disk driver.
http://h21007.www2.hp.com/portal/site/dspp/menuitem.863c3e4cbcdc3f3515b49c108973a801?ciid=c108771e35f02110771e35f02110275d6e10RCRD, unless devices are opened with NO_DELAY which will make 45 retries before blacklisting the device.
I cannot find wether LVM opens the PV's with NO_DELAY (lsof +fg /dev/[r]dsk/cxtydz doesn't show anything).
Is there some HP-UX internals things someone could point me to to get clear answers ?
In clear, if NO_DELAY is used, what is the timeout after which the system will decide to iterate the retries (up to 45 ones), or if NO_DELAY is not used, will the system hang undefinitely waiting for IO ack.
This last option doesn't seem to be true as the PV goes stale in reality.....
Thanks
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