LVM daemons

[Vivek Bhatia]

Hi
Please find the daemons below.

# ps -ef | grep -i lvm*
root 12 0 0 08:40:12 ? 0:00 lvmkd
root 13 0 0 08:40:12 ? 0:00 lvmkd
root 14 0 0 08:40:12 ? 0:00 lvmkd
root 15 0 0 08:40:12 ? 0:00 lvmkd
root 16 0 0 08:40:12 ? 0:00 lvmkd
root 17 0 0 08:40:12 ? 0:00 lvmkd
root 18 0 0 08:40:12 ? 0:00 lvmschedd
root 20 0 0 08:40:32 ? 0:00 lvmdevd
root 21 0 0 08:40:32 ? 0:00 lvmattachd

Q1. why we have 6 lvmkd daemons running on each system? And what is the use of these daemons in the system?

Q2.what is the use of lvmdevd daemon?

Q3.What is the use of lvmattachd daemon?

Thanks in Advance
Will wait for the reply

Thanks
Vivek Bhatia

[OldSchool]

i would assume that they are part of Logical Volume Manager..which manages disks and partitions

[Vivek Bhatia]

Hi

Thanks for the reply

But i am looking for the detailed information about the daemons running.

Thank you
Vivek Bhatia
HP-Unix Certified System Administrator

[Ivan Krastev]

Q1: see good explanation here - http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=96204

Q2: lvmdevd is a LVM device update/recovery daemon. One per each group.

Q3: this daemons is for watching physical volumes, marked as NOT_ATTACHED and attach it back to the volume group. For example when link disappear from SAN LUN's.

regards,
ivan

[Vivek Bhatia]

Thank you