I'm getting ready to load a fresh installation of RH7.1 onto a dual
pentium system with on-board Adaptec SCSI. The machine currently has a single IBM
DDRS-39130 9.1 Gb drive. I have three additional drives to be installed,
all DDRS-39130. Interestingly enough, two are COMPAQ branded and have 4
cylinders fewer than the ones that are reported as IBM.
I was going to make them all RAID5 but after reading the docs I see that
/boot must be on a RAID1 partition. My first thought is to create a small
partition on SDA and SDB, set as them as RAID1 and put /boot there. The
remainder of the drivespace would be configured as paritions that would be
set into a RAID5 array. The result would be somewhere around 27Gb of
available space.
Another possibility would be to set these four drives as two RAID1
mirrors. I would then end up with 18Gb of usable space. This is
conceptually simpler than mixing RAID0 and RAID5 on the same drives but
since this is software RAID, I *think* that mixing would be possible.
What I'd like is comments concerning my first plan -- that of mixing the
RAID configurations. I'm sure someone else has done this, or at least
considered it, so I'd appreciate any comments concerning the implications.
I'm particularly interested in comments about recovery considerations of
doing this.
I have two RH7.0 systems with mirrored arrays (one with 2x4Gb SCSI and one
with 2x1.6Gb IDE) that I've never had to recover from a drive
failure. The machine in question would be a file, database and webserver
for a small office network.
Any and all comments are appreciated. Thanks in advance!
Barry
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