Terastation Harddisk Layout (PPC)

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(Information on this page currently for the 1 TB version.)

The TeraStation has four Western Digital 250 GB harddisks (WDC WD2500BB-22GUC0) on four IDE buses of a IT8212 type controller. (Reportedly there are also versions with slightly smaller Maxtor disks.) Each disk is partitioned approximately like this:

  • partition 1, 400 MB, RAID auto-detect
  • partition 2, 120 MB, Swap
  • partition 3, rest of disk, RAID auto-detect
  • partition 4, 200 MB, RAID auto-detect

The hd*1 partitions are joined via RAID-1 to make the 400 MB root filesystem.

In the RAID-5 layout, The hd*3 partitions are joined via RAID-5 to make the 700 GB RAID space.

The use of the hd*4 partitions is currently unknown. Maybe there is an emergency system stored there. Hm, unlikely:

 Dec 12 13:48:40 LUXOR kernel: md: invalid raid superblock magic on hda4
 Dec 12 13:48:40 LUXOR kernel: md: hda4 has invalid sb, not importing!
 Dec 12 13:48:40 LUXOR kernel: md: could not import hda4!

probably just unused (maybe the extra space that is not available on the Maxtor drives?)

The hd*2 partitions are activated as individual swap spaces during boot. There is a potential problem here; should one of the disks die while in use, the whole system is likely to crash because of inaccessable swap space.


 hda                 hdb                 hdc                 hdd
 ----------          ----------          ----------          ----------
|          |        |          |        |          |        |          |
|  Part 1  |<RAID 1>|          |        |          |<RAID 1>|          |   Root FileSystem (400mb)
|          |        |          |        |          |        |          |
|----------|        |----------|        |----------|        |----------|
|  Part 2  |        |          |        |          |        |          |   SWAP File       (120mb)
|----------|        |----------|        |----------|        |----------|
|          |        |          |        |          |        |          |
|  Part 3  |<RAID 5>|          |<RAID 5>|          |<RAID 5>|          |   User Data       (REMAININGmb)
|          |        |          |        |          |        |          |
/          /        /          /        /          /        /          /
/          /        /          /        /          /        /          /
|          |        |          |        |          |        |          |
|          |        |          |        |          |        |          |
|----------|        |----------|        |----------|        |----------|
|  Part 4  |        |          |        |          |        |          |   Unknown         (200mb)
|          |        |          |        |          |        |          |
 ----------          ----------          ----------          ----------