hi ya
i think with 4 disks....
--- raid0 ---
raid1 -A raid1 -B
hda + hdd hdc + hdb
when things are working right... you can read data
from both sets of raid1 disks
when things die...
if hda dies... you boot off hdd
if hdc dies... you still have data on hdb
if id0 cable dies... you still have hdc and hdb
if id1 cable dies... you still have hda and hdd
problem with raid1 mirroring is if you delete stuff
on hda, you also deleted stuff on hdd
prefer data to be deleted manually, not because someone
did an accidental rm -rf /
- which means the above is reversed
----- raid1 -----
raid0 -A raid0-B
hda + hdd hdc + hdb
problem now is...
if hda dies... you cannot boot off hdd
if ide0 or id1 cable dies.. you cannot boot at all
---------------------------------------------------
c ya
alvin
-- options and configurations and setup and what one is
trying to protect against makes all the difference
in which configuration is better
On Fri, 18 May 2001, Benoit SERRA wrote:
> At 17/05/01 -0700, you wrote:
>
> >It is. The reason for my question is that some controllers do this
> >implicitly. I was just wondering what the official solution, in
> >software, is. There's no reason that you couldn't combine the two parts
> >into a linear array either. The first mirror is then written to until
> >full, and the the next is used. You don't get the increased write
> >performance by having the stripe though. Anyway, it just seems like md
> >should do this automatically, but it doesn't seem to, unless I'm missing
> >something entirely.
>
> I think that instead of doing 2 RAID 1 arrays, you better have to do 2 RAID
> 0 array. If one disk fail in a RAID 1 array, It could bring the entire
> array down (I ever saw such a thing), and your RAID 0 array will be down
> too. But in the other case, if a drive fail, it will only bring down the
> RAID 0 array, but NOT the RAID 1 one.
>
> I have tested the two setup, and I think that the second (RAID 0 then RAID
> 1), is the most reliable.
>
>
>
> --
>
> Moi j'aime Windows NT car cela me rappele mes petits cousins :
> "Benoit, on a rien fait et c'est cass�"
>
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