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Hi.

I've been reading the man-pages for raid and raidctl but can't seem to find
any info about the following scenario. If I have 4 identical disks, would it
be possible to create the following configuration with RaidFrame?

Array 1 - RAID1
50% of disk 1
50% of disk 2

Array 2 - RAID1
50% of disk 3
50% of disk 4

Array 3 - RAID5
Remaining 50% of disks 1, 2, 3 and 4

How would the config files look to accomplish this? Should I create 2
disklabels on each disk or could I define in the config that only part of
the disklabel should be used for a certain array?

An extra bonus would be if I could stripe the two RAID1-arrays thus creating
one RAID10.

Regards
PP

In article <SIPke.25463$d5.174702@newsb.telia.net>,
"transpetaflops" <usenet@pp.dyndns.biz> wrote:

> Hi.
>
> I've been reading the man-pages for raid and raidctl but can't seem to find
> any info about the following scenario. If I have 4 identical disks, would it
> be possible to create the following configuration with RaidFrame?
>
> Array 1 - RAID1
> 50% of disk 1
> 50% of disk 2
>
> Array 2 - RAID1
> 50% of disk 3
> 50% of disk 4
>
> Array 3 - RAID5
> Remaining 50% of disks 1, 2, 3 and 4
>
> How would the config files look to accomplish this? Should I create 2
> disklabels on each disk or could I define in the config that only part of
> the disklabel should be used for a certain array?
>
> An extra bonus would be if I could stripe the two RAID1-arrays thus creating
> one RAID10.

as a starting point ...
for each disk use disklabel to create 2 partitions (or type RAID)
(using f and g)

riad0.conf would be
start array
1 2 0
start disks
/dev/wd0f
/dev/wd1f
start layout
32 1 1 1

riad1.conf would be
start array
1 2 0
start disks
/dev/wd2f
/dev/wd3f
start layout
32 1 1 1

and riad2.conf would be
start array
1 4 0
start disks
/dev/wd0g
/dev/wd1g
/dev/wd2g
/dev/wd3g
start layout
32 1 1 5

disklabel up raid0 and raid1 with 1 partition each - h and the

raid3.conf would be
start array
1 2 0
start disks
/dev/raid0h
/dev/raid1h
start layout
32 1 1 0

Note the above is a starting point that should give you one raid 5 on
dec raid2 and a raid 10 on raid3

hope that helps
R.

> as a starting point ...
> for each disk use disklabel to create 2 partitions (or type RAID)
> (using f and g)

<snip>

> Note the above is a starting point that should give you one raid 5 on
> dec raid2 and a raid 10 on raid3
>
> hope that helps
> R.

Thanks Ryoko. I will try these examples and and see if I can make any sense
of them. :-)
/PP

Yes it is possible;

Take a look to my configuration (It's a netbsd box but It works the same
manner).

I have 4 disks splitted in 3 raid5 array. (note: that's really not a
good setting for perf).
This is not exactly what you but you can easily adapt to what you want.
Anyway there are my conf files :

1 . disklabel for my 4 disks :

# /dev/rwd0d: (first disk , but all are identicals)
type: ESDI
disk: ESDI/IDE disk
label: IBM0 #(name each disk to avoid confusion)
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 16
sectors/cylinder: 1008
cylinders: 16383
total sectors: 241254720
rpm: 7200
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0 # microseconds
track-to-track seek: 0 # microseconds
drivedata: 0

16 partitions:
# size offset fstype [fsize bsize cpg/sgs]
c: 241250000 63 unused 0 0
e: 80416666 63 RAID
f: 80416666 80416729 RAID
g: 80416666 160833395 RAID


2. raid0.conf :

START array
# numRow numCol numSpare
1 4 0

START disks
/dev/wd0e
/dev/wd1e
/dev/wd2e
/dev/wd3e

START layout
# sectPerSU SUsPerParityUnit SUsPerReconUnit RAID_level_5
32 1 1 5

START queue
fifo 100

3. raid1.conf :

START array
# numRow numCol numSpare
1 4 0

START disks
/dev/wd0f
/dev/wd1f
/dev/wd2f
/dev/wd3f

START layout
# sectPerSU SUsPerParityUnit SUsPerReconUnit RAID_level_5
32 1 1 5

START queue
fifo 100

etc...


--
raf


transpetaflops wrote:
> Hi.
>
> I've been reading the man-pages for raid and raidctl but can't seem to find
> any info about the following scenario. If I have 4 identical disks, would it
> be possible to create the following configuration with RaidFrame?
>
> Array 1 - RAID1
> 50% of disk 1
> 50% of disk 2
>
> Array 2 - RAID1
> 50% of disk 3
> 50% of disk 4
>
> Array 3 - RAID5
> Remaining 50% of disks 1, 2, 3 and 4
>
> How would the config files look to accomplish this? Should I create 2
> disklabels on each disk or could I define in the config that only part of
> the disklabel should be used for a certain array?
>
> An extra bonus would be if I could stripe the two RAID1-arrays thus creating
> one RAID10.
>
> Regards
> PP
>
>
>