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Re: [linux-lvm] Flexible storga: LVM setup on top of mdadm sets. Good idea or not?



On Mon, Aug 20, 2007 at 08:33:26PM -0400, Stuart D. Gathman wrote:
On Mon, 23 Jul 2007, Luca Berra wrote:

On Sun, Jul 22, 2007 at 02:57:33PM -0400, Stuart D. Gathman wrote:
>The main drawback to md raid1 is that it always resynchronizes
>the *entire* partition when a disk goes offline temporarily.  I also

False. md uses bitmaps to avoid this.

Ok, I just tested this with Centos-5.0, kernel-2.6.18-8.1.8.el5.
I shutdown with md1 50% resynced, and when it boots, it starts over
at the beginning.  Maybe we are talking about different things, but
it is a major annoyance that it restarts the sync from the beginning
if it misses just one update (e.g. unexpected power failure or reboot).

did you add the bitmap to your md array?

L.

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