Re: Effects of setting linux block device readahead size

I also thought that LVM is unsafe for WAL logs and file system journals with
disk write cache -- it doesn't flush the disk write caches correctly and
build write barriers.

As pointed out here:
http://groups.google.com/group/pgsql.performance/browse_thread/thread/9dc43991c1887129
by Greg Smith
http://lwn.net/Articles/283161/

On Thu, Sep 11, 2008 at 3:41 PM, Alan Hodgson <ahodgson(at)simkin(dot)ca> wrote:

> On Thursday 11 September 2008, david(at)lang(dot)hm wrote:
> > while I agree with you in theory, in practice I've seen multiple
> > partitions cause far more problems than they have prevented (due to the
> > partitions ending up not being large enough and having to be resized
> > after they fill up, etc) so I tend to go in the direction of a few large
> > partitions.
>
> I used to feel this way until LVM became usable. LVM plus online resizable
> filesystems really makes multiple partitions manageable.
>
>
> --
> Alan
>
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