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I have a mdadm RAID setup complete with a swap volume. I can use the volume for swap easy enough, but when I go to mark it as swap in the fstab, I get a system startup hang.

# /dev/md125
UUID=35c85af-6d3e-48f4-9fc7-9584b29d19a6 none swap defaults 0 0

Is this supported or do I need to somehow make it so that /dev/md* is always the same values (and thus won't have to use UUIDs)?

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In most Linux distros (including ArchLinux) directory /dev/disk/by-*/ contains symlinks to /dev/* disk block devices that are persistent through reboots. /dev/mapper/ will also probably contain symlinks for your /dev/md* devices. See wiki.archlinux.org/index.php/Persistent_block_device_naming for more information. Could you try replacing the UUID part with such a device entry in /etc/fstab and report back? – jaume Nov 29 '12 at 14:11

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