[Beowulf] Re: Beowulf Storage Node

Alan Louis Scheinine alscheinine at tuffmail.us
Wed Apr 15 20:50:33 EDT 2009


With regard to booting from RAID, with software RAID some partitions
can be RAID 6 and others RAID 1.  The boot information can go on a
small partition labeled /boot in RAID 1.  On a machine that had a two-channel
Adaptec controller -- if I remember correctly -- disks from both channels
were used together in RAID 5 yet the number of Master Boot Records was 2,
one for each channel.  There is a way to write the same MBR for each channel,
but I don't trust my memory to explain how.  It might seem rather complex --
or by now it might be a simple grub option -- in any case you can have each MBR
go to the /boot partition that is on the same disk.  For this controller
it was necessary to enter the BIOS during boot-up to change the choice of which
channel to read the MBR if one of the two was on a failed disk.

Best regards,
Alan

-- 

  Alan Scheinine
  200 Georgann Dr., Apt. E6
  Vicksburg, MS  39180

  Email: alscheinine at tuffmail.us
  Mobile phone: 225 288 4176
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