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Linux Persistent Binding Feature

 
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loco_vikide
Frequent Advisor

Linux Persistent Binding Feature

Could anynone please elaborate on Linux Persistent Binding Feature. What are the main functionalities? What are the pros and cons of enabling it?

Thx.
Chris
7 REPLIES
skt_skt
Honored Contributor

Re: Linux Persistent Binding Feature

There is a "persistent binding" at the storage level? What is your scenario exactly..
loco_vikide
Frequent Advisor

Re: Linux Persistent Binding Feature

Hi Santhosh Kumar Theyyan,
Thank you for replying. My question revolves around storage. I am experiencing some sporadic inconsistent queried info on storage devices. Pseudo device names change quite often. I am not using Linux Persistent Binding feature and looking into using it to fix my issues.
Regards,
Chris.
skt_skt
Honored Contributor

Re: Linux Persistent Binding Feature

which storage(EMC)?which Linux version?
when do a see the change? after a reboot of the host or which ever is applicable in your case..so further information required to help you
dirk dierickx
Honored Contributor
Solution

Re: Linux Persistent Binding Feature

you can do this with udev, there you can specify rules for which devices should have which /dev entry.

all information is included in the manpages - man udev
Ivan Ferreira
Honored Contributor

Re: Linux Persistent Binding Feature

For exact information please see:

http://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/Virtualization-en-US/ch-virt-lun-persistence.html

Don't forget to assign points to the answers you get. For information about this please also see:

http://forums1.itrc.hp.com/service/forums/helptips.do?#28
Por que hacerlo dificil si es posible hacerlo facil? - Why do it the hard way, when you can do it the easy way?
loco_vikide
Frequent Advisor

Re: Linux Persistent Binding Feature

Thank you very much for the info that all of you have sent. It is very useful. Cheers.

Chris
skt_skt
Honored Contributor

Re: Linux Persistent Binding Feature

see the binding for DM devices

root [/sbin]cat /var/lib/multipath/bindings
# Multipath bindings, Version : 1.0
# NOTE: this file is automatically maintained by the multipath program.
# You should not need to edit this file in normal circumstances.
#
# Format:
# alias wwid
#
mpath0 350060160b060352550060160b0603525
mpath1 3600601607237160055901448f2b5da11
mpath2 360060160723716002203af5cd2f1db11
mpath3 36006016072371600c9568c2171c9da11
mpath4 3600601607237160080abebebd593dc11
mpath5 360060160723716008ec7259dedd4dc11

root [/dev/mpath]ll
total 0
lrwxrwxrwx 1 root root 8 Feb 19 23:57 mpath1 -> ../dm-37
lrwxrwxrwx 1 root root 8 Feb 19 23:57 mpath10 -> ../dm-45
lrwxrwxrwx 1 root root 8 Feb 19 23:57 mpath11 -> ../dm-46
lrwxrwxrwx 1 root root 8 Feb 19 23:57 mpath2 -> ../dm-38
lrwxrwxrwx 1 root root 8 Feb 19 23:57 mpath4 -> ../dm-39
lrwxrwxrwx 1 root root 8 Feb 19 23:57 mpath5 -> ../dm-40
lrwxrwxrwx 1 root root 8 Feb 19 23:57 mpath6 -> ../dm-41
lrwxrwxrwx 1 root root 8 Feb 19 23:57 mpath7 -> ../dm-42
lrwxrwxrwx 1 root root 8 Feb 19 23:57 mpath8 -> ../dm-43
lrwxrwxrwx 1 root root 8 Feb 19 23:57 mpath9 -> ../dm-44