| Scyld ClusterWare HPC: Reference Guide | ||
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/usr/sbin/beofdisk [-h, --help] [-v, --version] [-q, --query]
[-w, --write] [-d, --default] [-M, --mbr]
[-n num, --node num]
This script allows you to partition the hard drives on compute nodes.
When you query, it will create files in /etc/beowulf/fdisk/, one for each device/drive geometry it finds. These files can then be modified by hand, or with the defaults options, then written back to the hard drives.
Display a help message and exit.
Display version information and exit.
Queries the hard drives and writes their current partition tables into files in /etc/beowulf/fdisk/. If no -n num node is specified, then all nodes are queried.
Matches the files in /etc/beowulf/fdisk/ with the hard drives and changes the partition tables on the compute nodes to match what is in the files. If no -n num node is specified, then all nodes are written.
WARNING: This option is potentially dangerous. It modifies partition tables, and incorrect partition tables can cause problems.
This will cause beofdisk to go through the files in /etc/beowulf/fdisk/ and set them all to contain default partitioning schemes that include a beoboot partition, a swap partition, and the rest as /.
Write a simple Master Boot Record to the hard drive that directs the BIOS to "boot next device" after each failure to boot. Typically, this ultimately results in a PXE boot. If no -n num node is specified, then all nodes are written with this new MBR.
By default, the apply the specified operation to all nodes. Optionally, apply the operation only to node num.
Creating default partition schemes:
[root@cluster ~] # beofdisk -d Creating a default partition table for hda:2495:255:63 Creating a default partition table for hda:1222:255:63 |
Writing the defaults to node 0's hard drive:
[root@cluster ~] # beofdisk -w -n 0 Disk /dev/hda: 2495 cylinders, 255 heads, 63 sectors/track Old situation: Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/hda1 * 0+ 0 1- 8001 89 Unknown /dev/hda2 1 32 32 257040 82 Linux swap /dev/hda3 33 2494 2462 19776015 83 Linux /dev/hda4 0 - 0 0 0 Empty New situation: Units = sectors of 512 bytes, counting from 0 Device Boot Start End #sectors Id System /dev/hda1 * 63 16064 16002 89 Unknown /dev/hda2 16065 546209 530145 82 Linux swap /dev/hda3 546210 40082174 39535965 83 Linux /dev/hda4 0 - 0 0 Empty Successfully wrote the new partition table Re-reading the partition table ... If you created or changed a DOS partition, /dev/foo7, say, then use dd(1) to zero the first 512 bytes: dd if=/dev/zero of=/dev/foo7 bs=512 count=1 (See fdisk(8).) Node partition tables have been modified. You must reboot each affected node for changes to take effect. |
Query the disks on the compute nodes to determine how they are partitioned:
[root@cluster ~] # beofdisk -q |
The following creates a partition file in /etc/beowulf/fdisk, with a name similar to sda:512:128:32 and containing lines similar to the following:
[root@cluster ~] # cat sda:512:128:32 /dev/sda1 : start= 32, size= 8160, id=89, bootable /dev/sda2 : start= 8192, size= 1048576, Id=82 /dev/sda3 : start= 1056768, size= 1040384, Id=83 /dev/sda4 : start= 0, size= 0, Id=0 |
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