[ale] Fwd: Re: [ale] Recommendations on mirrored LVM..?

[Keith Hopkins]

James P. Kinney III wrote:
> On Sun, 2002-06-16 at 00:08, Eric Webb wrote:
> 
>>On Saturday 15 June 2002 01:26 pm, James P. Kinney III wrote:
>>
>>>In your example setup you asked if you can add a second LV to an
>>>existing raid configuration. No. That would be a new raid configuration.
[snip]

> Now can it do it's magic without failure? As there are a flock of
> potential gotchas, it requires some intense effort on the admin part to
> carry it out glitch free. The main environment requirement is the
> existence and use of a maintenance period where the system can be run in
> a degraded mode to allow the resynching of a mirror. The extension of
> the LV space currently requires the unmounting and remounting of the
> filesystem being worked on. So databases must be stopped. HP-UX can,
> with proper kernel patches and other stuff, extend a mounted partition
> (slick!). At present, the Linux LVM can't. 

{symantics check}
Sure LVM (1.0.1-rc2 or newer) can extend/reduce the LV while it's fs is mounted.  It's the filesystem on top of LVM that gets all bent out of shape and has to be unmounted before it can be resized (currently).

**Disclaimer** reduce you LV at your own risk!
Reducing the LV smaller than the FS on top of it will corrupt your fs, cause data loss and premature wrinkles.

-- 
Lost in Tokyo,
   Keith



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