Harddisk Layout
From Terastation
(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) | | | | | | | | ---------- ---------- ---------- ----------
