Re: Poor write performance with write-intent bitmap?

[John Robinson <john.robinson@anonymous.org.uk>]

On 22/04/2009 15:02, Goswin von Brederlow wrote:
> John Robinson <john.robinson@anonymous.org.uk> writes:
>> Another issue might be the LVM layer; does that need to be stopped or
>> switched to read-only too?
> 
> Debian does
> 
> /sbin/vgchange -aln --ignorelockingfailure || return 2
> 
> before S60mdadm-raid, S60umountroot and S90reboot.

But that's not going to switch any VG with a still-mounted filesystem 
(e.g. /) to read-only or make it go away, it's going to fail. Still 
probably a good idea for other circumstances, though.

> I've been using a 1GB / for years and years now so that won't be a
> problem. As for the rest one can also bind mount /usr, /var, /home to
> /mnt/space/* respectively. I.e. have just 2 (/ and everything else)
> partitions.

Well, I have just 2, /boot and everything else, but I might in the 
future switch to your suggestion.

> Esspecially for XEN hosts I find LVM verry usefull. Makes it easy to
> create new logical volumes for new xen domains.

My thoughts exactly :-)

Many thanks,

John.