lvmkd

[Lai Nee Shyang_1]

Hi there,

What is lvmkd and what does it do ? I've encounter on my HP-UX11.0 , a couple of lvmkds taking up a lot of CPU time (top on glance process list). What could be wrong?

Thanks

Lai

[eran maor · Accepted solution]

Hi

The lvmkd's are daemon processes that watch a queue. When a job
arrives in the queue an lvmkd launches the job as a process,
which is now managed by the kernel and is subject to the normal
priority and CPU constraints as other processes.

The following are the routines that call lvmkd:

* NAME: lv_check_pf_pvs
*
* FUNCTION:
* Look at all disks belonging to any volume group, if the device is
readable.
* assume it has come back to life and restart any I/O waiting for it.

* NAME: lv_startpv
*
* FUNCTION: Initiate all I/O pending for a given physical volume.
* Must not be called from within an interrupt
* service routine (biodone) to prevent recursion
* and reentry of the physical disk driver.

* NAME: lv_reschedule
*
* FUNCTION:
* Schedule pended logical operations. This function is called
when ever physical buffers have been released and there are
logical buffers waiting for physical buffers. This will
schedule as many pended logical buffers as possible given the
number of available physical buffers.
*
* NAME: lv_begin
*
* FUNCTION:
* Begin physical I/O operations.
* NAME: lv_initiate
*
* FUNCTION: Initiate all ready logical requests for a logical
volume.
*
* lv_resync_pfpv:
*
* For every PV in every VG, check for the LVM_PVNEEDSYNC flag
* and resync those PVs.