[Beowulf] Software RAID?

Geoff Jacobs gdjacobs at gmail.com
Thu Nov 22 07:47:38 PST 2007

Joe Landman wrote:
> For small numbers of drives, yes, the MD driver is superb with two
> (well, really three) caveats.
> First:  No hot swap.  You can do a kind-of-cold swap (have to take the
> mount offline, and can execute a few MD raw-disassemble, and then turn
> the device off, swap, force Linux to rescan the scsi bus, mark the drive
> as a hot spare, and force reassembly ... then remount).  This may or may
> not work, depending upon the linux driver for the SATA port.  Some get
> very unhappy if the drive goes away after it found it.
Is this primarily a driver issue? Are there any provisions in libata for
rectifying it (if it's a software problem only)?


Geoffrey D. Jacobs

To have no errors
  would be life without meaning
  No struggle, no joy

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