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Re: "Swap area shorter than signature indicates"

On Mon, May 07, 2007 at 09:24:18PM +0200, Matteo Vescovi wrote:
> The subject of this mail is the message I can find for every boot in my
> /var/log/messages file.
> I've set up a RAID1 environment with etch amd64; it's composed of 2
> identical HDDs. The partitioning scheme is the same for both the devices.
> I've put the swap area (a /dev/md1 made by /dev/sda5 and /dev/sdb5) in
> the RAID, setting the ID label as "fd" (that is the 'Linux raid
> autodetect' mode).
> The /proc/mdstat file says about that partition:
> md1 : active raid1 sda5[0] sdb5[1]
>       1951744 blocks [2/2] [UU]
> Is that correct?

That message is what to expect for a raid1 with both devices up and
running (U = Up)

> Is the swap area working right despite the message above?
> If so, why do I get that strange message in the logs?

Did you mkswap /dev/md1 or /dev/sda5?

Try doing swapoff, then make sure free shows no swap space, then use
mkswap to recreate the swap on /dev/md1 and then swapon again and see if
it gives a message then.  Making the swap on the low level filesystem
rather than the raid one would cause such problems, as would taking an
existing swap partition and adding a new drive and making raid on it and
not reinitializing the swap space to match the new slightly smaller size
(since raid does require a small superblock to store it's information).

Len Sorensen

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