[linux-lvm] LVM skips /dev/hde3 because sysfs tells it not to use it

[linux-lvm] LVM skips /dev/hde3 because sysfs tells it not to use it

[Stefan Monnier]

I had to disable sysfs_scan before pvcreate accepted to use /dev/hde3 on
a little MIPS box.

How does LVM decide whether sysfs tells it to use a block device or not?
And why would /dev/hde (an internal IDE drive) be presented by sysfs as
"not to be used by LVM"?


        Stefan

Re: [linux-lvm] LVM skips /dev/hde3 because sysfs tells it not to use it

[Alasdair G Kergon]

Version of lvm2 userspace?
Version of kernel and relevant config options for sysfs?

Alasdair
-- 
agk@redhat.com

Re: [linux-lvm] LVM skips /dev/hde3 because sysfs tells it not to use it

[Milan Broz]

Stefan Monnier wrote:
> I had to disable sysfs_scan before pvcreate accepted to use /dev/hde3 on
> a little MIPS box.
> 
> How does LVM decide whether sysfs tells it to use a block device or not?
> And why would /dev/hde (an internal IDE drive) be presented by sysfs as
> "not to be used by LVM"?

It should be possible to use the device unless there is some filter set.

Run the command with debug on (add -vvvv) and you will see which filter disabled
the device and why.

I guess you can also hit this "known" problem with 
old lvm toolset (<2.02.29) and new kernel with new sysfs layout.

*If* it is this situation you can fix it using one of the following
	1) disable sysfs scan
	2) upgrade lvm 
	3) switch CONFIG_SYSFS_DEPRECATED_V2 kernel config on and recompile kernel

Milan
--
mbroz@redhat.com

[linux-lvm] Re: LVM skips /dev/hde3 because sysfs tells it not to use it

[Stefan Monnier]

> I guess you can also hit this "known" problem with 
> old lvm toolset (<2.02.29) and new kernel with new sysfs layout.

Yes, sorry about that, that was the culprit.  I had done a "apt-get
upgrade", but forgot that this box runs Debian "stable".  After upgrading lvm2
to the "testing" version of the lvm2 package, the problem disappeared.

Thank you for your help,


        Stefan