[linux-lvm] expanding on LVM2
sharad.tiwari at wipro.com
Wed Apr 2 05:13:03 UTC 2003
This is a plain text mail (no html) ... hope it does reach you
> >LVM(2) handles that by using physical volume uuids (as you mention
> >Device paths can change that way and LVM will stil find the disks and
> >assemble them correctkly into volume groups.
Will the PV uuid be unique ... I mean to say is there a possibility of
two nodes issuing same PV uuid (when working independently)
If I connect multiple hard disks to a node, take a partition on a node
(say /dev/hdd1) and make a physical volume out of it, and then connect
the hard disk as a primary slave( /dev/hdb) and then run a pvdisplay ,
the physical volume does show the device name as /dev/hdb but cribs
about not finding /dev/hdd ... can this be avoided.
One more question I had was, How exactly is a raw device operation
request handled in LVM.
I was going through the code and did not find any character device
interface(for raw device operations) ... but again dd worked on the
logical volume .. so I am wondering how dd worked in the absebce of a
raw device operation support.
> >For 'pricate' volume group the situation is a failover situation.
> >You need have a design which makes sure that only one node can have
> >volume group active at any given time and if that one fails,
> >the failure, make sure the the failed node can't get back to life
(which > >will cause strange problems) and take the VG over at an
arbitrary other node.
Two questions I have on this are :
What is the failover mechanism being followed in LVM2 ???
I found out that when I do a vgcreate, a file called vgcreate.tmp is
created which is later renamed as vgcreate, now what happens if the node
happens to crash just after these entries are written onto the hard
If I happen to change the configurations where are they stored ??
Thanks for the help,
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