Hi folks!

I need some information about the raid 5 (or 6) using 2 different controller
(one integrated in the mother board: 6 sata disks, and other pci controller
with 4 disks support).

Is there any problem about data security and/or performance?

Is it a bad idea?

Thanks :-)
Pol


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On Mon, Jan 28, 2008 at 11:33:12AM +0100, Pol Hallen wrote:
> I need some information about the raid 5 (or 6) using 2 different controller
> (one integrated in the mother board: 6 sata disks, and other pci controller
> with 4 disks support).
>
> Is there any problem about data security and/or performance?
>
> Is it a bad idea?

Most motherboard's supposed RAID is BIOS-assisted Microsoft software
RAID and doesn't work with Linux. Which leaves Linux software raid.

Doug.


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In article <9QCxc-7zz-7@gated-at.bofh.it>,
"Douglas A. Tutty" <dtutty@porchlight.ca> wrote:

> On Mon, Jan 28, 2008 at 11:33:12AM +0100, Pol Hallen wrote:
> > I need some information about the raid 5 (or 6) using 2 different
> > controller
> > (one integrated in the mother board: 6 sata disks, and other pci controller
> > with 4 disks support).


> >
> > Is there any problem about data security and/or performance?
> >
> > Is it a bad idea?

I have done this many times it works well.
Assuming linux software raid you need to match your stripe size to the
ext2 stride size.
Also there are performance issue using ext3 the journal slows things
down considerably.

For office type use I prefer to use EXT3. But for systems that are using
the RAID as a huge transfer buffer I prefer EXT2 so as to avoid the
journal.

for the best of both worlds (in theory) you can keep a partition on your
system disk, or on a separate disk for the journal. In theory this would
remove the performance constraint. You need to make sure you have a big
enough partition for the journal. I have not tried this solution but in
theory it should work.

>
> Most motherboard's supposed RAID is BIOS-assisted Microsoft software
> RAID and doesn't work with Linux. Which leaves Linux software raid.
>
> Doug.


The other HUGE problem with cheap hardware raid is that in 5 years time
when your controller dies there is no practical way to recover the data.
With software raid you will always be able to recover given any single
HW failure.

Stuart.


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On Jan 29, 2008, at 10:19 AM, Stuart Gall wrote:
> The other HUGE problem with cheap hardware raid is that in 5 years
> time
> when your controller dies there is no practical way to recover the
> data.

Well, except restoring it from the backup you made. You *did* make
one, right? RAID (hardware OR software) isn't a substitute for backups.


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