On Thu, 17 Jan 2008, Patrick Zaloum wrote:
Hello!
I am planning on installing a new Etch server. What I would like is to
use 3xSATA2 disks to create a RAID5 array. During the install I know I
can create md RAID devices from the partition tables I set up
identically on the 3 disks, but is there a more attractive way to set
up the array so that the system is fully RAID5 instead of 6 or 7 RAID5
devices over 3 SATA disks?
I investigated using motherboards with onboard "software" RAID
chipsets, but am worried about compatibility issues. Googling gave me
the dmraid package that should be compatible with the "Intel(R) Matrix
Storage Technology".. (ICH8R) but I don't know if I can use this
"pre-install" so that it works almost as a true hardware RAID.
Could anyone give me some pointers or shed some light on these issues?
Thanks,
Pat
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Up to you, for my root filesystem I usually keep it RAID1 and use other
disks for the RAID5.
In any event if you go RAID5 with 3 disks whether you use the Intel Matrix
RAID and use the md driver you'll still need a /boot as lilo/grub cannot
boot off of RAID5, not sure for dm.
I have 2 disks in RAID1 and 10 disks in RAID5, separation between the data
and the root filesystem is the best idea IMO, you'll get poor random
access speeds for kernel compiles etc on RAID5, would recommend RAID1 for
root fs.
Justin.
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