> ką šiuo atveju OS'as darys su dviem diskais?

OS'as suksis kaip ant vieno disko.. tik kabes ant RAID1 :)

> Jei nori RAIDn OS'ui - naudok tą patį masyvą kaip ir duomenims, vieną diską paskirk 'hot spare'.

Cia jei isides ta papildoma RAID kontroleri..
Jis speju kokia ~0,7-1,0++ kLt gali ir suest.
http://www.markit.eu/lt/lt/hp-smart-array-p212-zero-memory-controller-storage/v2p556340
http://www.markit.eu/lt/lt/hp-smart-array-p410-256mb-controller-storage-controller/v2p556327
http://h18000.www1.hp.com/products/quickspecs/13203_div/13203_div.html
The P212 is ideal for RAID 0, 1, 1+0, and can be upgraded with 256 MB Cache module for RAID 5, 5+0
and additionally with Battery Kit and Smart Array Advanced Pack (SAAP) license key for RAID 6 (ADG), & 6+0.
The P410 is ideal for RAID 0, 1, 1+0, 5, 5+0 and can be upgraded with a minimum 256MB
cache module, battery kit (for BBWC), Flash Backed Write Cache (FBWC),
and Smart Array Advanced Pack license key for RAID 6 (ADG), & 6+0.

O jei paliks HP Embedded Smart Array B110i
SATA RAID Controller (RAID 0/1/10), 4 ports for HDD:
http://h18000.www1.hp.com/products/quickspecs/13495_div/13495_div.html
It will support a maximum of two (2) logical drives. It supports Raid 0, 1 and 1+0.
NOTE: Hot-Plug functions require the purchase of the
HP Smart Array Hot Plug Advanced Pack for B110i (~149$).

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gopenzo: "Gražiai atrodo RAID5, RAID6, bet ten kaip
suprantu gali užtrukti duomenų atkūrimas smigus vienam diskui."

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Gincyjates apie RAID'u krutumus, o tu RAID5-6 matyt neciupines,
tai gal pradziai RAID1 per akis.. bent kiek paprasciau, o gal ir pigiau..

Pacioj pradzioj siuliau Intel'io konstruotis, tai ten SAS RAID 1/0/1+0 bent pigus ir su Hot-Plug.

Siaip dar jei primest 1TB duomenu.. nu tai RAID5.. rimtus diskus.. 10000rpm ar 15000rpm..
Eina po 600GB.. yra po 900GB.. tarkim 3*600GB_RAID5=1.2TB .. tiesa, po kiek jie? :))