motherboard with raid controller

[Giannis Stoilis]

fs wrote:
> an exoume 24 gigabytes dedomenwn pou 8eloume na diafilaksoume, mporoume
> na paroume 48 diskous tou 1 gigaB kai na tous kanoume mirroring
> zeugaria me raid-1. tote 8a exoume 24 RAID-1 me tin gnwsth megalh
> asfaleia pou to raid-1 prosferei. Me dedomeno oti 8eloume na diafilaksoume
> kai ta 24 gigaB eksisou, an paroume auta ta 24 zeugaria kai ta kanoume
> ena array typou RAID-0 (dld, ena RAID-1+0) tote i asfaleia *tou sunolou*
> twn dedomenwn 8a pesei;

To gamises! ;-) OK, an kaneis to mirror tou mirror, einai asfales. Apo 
epidwseis pws 8a ta paei omws? Gia na graftei ena 1 bytes, 8a staloun 
24, sthn kaluterh periptwh. Kalo sthn 8ewria, alla sthn praksh den mou 
fainetai na stekei kai polu. Aksizei to overhead?

Pantws, raid 1+0 paizei polu teleutaia. Kaneis 2 array me raid1, kai kai 
ta enwneis me raid0 mesw software. Eixa dei ena ar8ro gia freebsd 
sxetiko, alla gia linux den brhka tipota. Ginetai? To exei kanei arage 
kaneis? 8a h8ela na akousw sxolia.

> auto pisteuo apantatai me ti koinh logikh. sta raid 2,3,4 ke 5 den
> gnorizo leptomereies gia na ekfero gnomh peri tis asfaleias tou *sunolou*
> twn dedomenwn pou 8eloume na diafilaksoume otan o ari8mos twn diskwn
> "varies".
Genika, se database servers pou exw sthsei, bazoume raid1 gia to 
leitourgiko sto ena kanali kai raid5 gia thn bash,
+1 standby sto allo. 6 diskoi, gia to kalhmera... nice? Pws to eixe pei 
kapoios mesa sthn lista? "Inexpensive array my ass!"... ;-)

- Giannis Stoilis