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[linux-lvm] LVM on an external USB device - why not?

My current system configuration is a 250GB internal IDE HDD, managed using LVM2 under Fedora Core 6. What I would like to do is to put this disk into an external USB enclosure to reduce heat generation inside the PC. Another reason is to allow the addition of extra disks very easily (current case only has room for 1x 3.5" HDD).

Once the USB drive is connected, I will be performing the initial boot stages off a small (2GB) solid-state CF disk, so I don't necessarily need the full "boot from USB" capabilities.

I can't see any problems in doing so myself. I realise that if additional usb-storage devices are added, then the raw device may change from /dev/sda to /dev/sdb, but with LVM using PV UUIDs to locate devices, won't that be irrelevant?

Are there any caveats to doing this? I haven't seen anything particularly relevant on the archives of this mailing list, and I've Googled around the subject. I did discover a couple of boot-from-USB walkthroughs scattered around the web which unhelpfully said "don't do it" without giving any particular reasons. That was from some old posts (c. 2005), without any citations, and didn't mention LVM2 so could have been based on LVM1.

All advice welcomed.


Ian Burnett :: www.ianburnett.com

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