Re: (no subject)

hiya eddie

i think you want raid5 w/ 3 disks instead of 3 copies of the same
data on 3 disks w/ raid1

watch our for old raid commands (mkraid ) vs new raid commands (raidstart)

More raid commands
       http://www.1U-Raid5.net/HowTo/Commands.uhow2.txt

have fun raiding
alvin

#
#
# sample /etc/raidtab
#
# To start it up
# --------------
#	fdsisk /dev/sda
#	--> use FD raid partion ( 1 partition - the whole disk ?)
#
#	raidstart /dev/md0
#	cat /proc/mdstat	--> see if all 3 disks is listed
#	mke2fs -j /dev/md0
#	mount /dev/md0 /RAID
#
#	dd if=/dev/random of=/RAID/test.big count=1000000
#
#
#
raiddev /dev/md0
raid-level 5
#
nr-raid-disks 3
#  note the above
#
nr-spare-disks 0
persistent superblock 1
parity-algorithm left-symmetric
#
#
# That's a huge chunk .... units are 1024 block * chunk-size 
# chunk-size 2048
chunk-size	8
#
#
# use the "partition" on the disk and define the raiddev device /dev/md0
#
device /dev/sda1
raid-disk 0
#
device /dev/sdb1
raid-disk 1
# 
device /dev/sdc1
raid-disk 2
#
# end of raidtab file


On Wed, 11 Sep 2002, Eddie Johnson wrote:

I installed Suse Linux Professional 8 on a HP Netserver LC3 PII/450.  An
AHA-2940 UW Scsi host adapter with a AIC-78XX Scsi Protocol Chip/50 pin
high density scsi-2 control.  I have a raid (3 drives) off the host
adapter and a 80 gig scsi drive off the mother board. After launching
yast2 the first raid has the following device: LD0 raid 5 34730R:
device_name /dev/sda, vendor megaraid.  Disk two (80 gig drive) has LD1
raid 0 70006R: device name /dev/sdb vendor the same as above.  There was
no raidtab file so I created one with the following:

raiddev /dev/md0
raid-level 5
nr-raid-disks 1(little sketchy on this because it is three drives that
make up the raid)
nr-spare-disks 0
persistent superblock 1
parity-algorithm left-symmetric
chunk-size 2048
device /dev/sda
raid-disk 0 (sketchy here as well)

#Second drive
raiddev /dev/md1
raid-level 5
nr-raid-disks 1
nr-spare-disks 0
persistent-superblock 1
chunk-size 2048
device /dev/sdb
raid-disks 1 (sketchy as well)

Trying to follow the procedures and I type:
mkraid /dev/md0 and I get:

Handling md device /dev/md0
analyzing super-block
disk 0: /dev/sda, 35563520kb, raid superblock at 35563456kb

Second drive I get:

Handling md deviice /dev/md1
analyzing super-block
disk 0: /dev/sdb, 71686144kb, raid superblock at 71686080kb

I then type cat /proc/mdstat and get the following:

Personalities [RAID5]
read_ahead not set
md1: inactive sdb [0]
     71684096 blocks
md0: inactive sda [0]
     35561472 blocks
unused devices: <none>

If I read this correctly both are inactive when it should be stating
that they are active.  At this point I am baffled any suggestions or
possible directions would greatly be appreciated.


Thanks in advance,
Ed

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