On 22/12/2011 21:36, Keith wrote:
I am having some trouble getting 4 x 2TB sata disks into one big
single softraid (raid 5) disk. I can create the softraid0 disk and
it's 5.5TB want would like to get a single 5.5TB partition but can
only make one single 1.5TB partition! Can someone tell me where I'm
going wrong.
Thanks
Keith
===================
Start from fresh and delete softraid0 disk...
#bioctl -d sd0
## Wipe the first part of the disks.
#dd if=/dev/zero of=/dev/rwd0c bs=10m count=1
#dd if=/dev/zero of=/dev/rwd1c bs=10m count=1
#dd if=/dev/zero of=/dev/rwd2c bs=10m count=1
#dd if=/dev/zero of=/dev/rwd3c bs=10m count=1
#fdisk -iy wd0
#fdisk -iy wd1
#fdisk -iy wd2
#fdisk -iy wd3
## Make a partition of type RAID
#printf "a\n\n\n\nRAID\nw\nq\n\n" | disklabel -E wd0
#printf "a\n\n\n\nRAID\nw\nq\n\n" | disklabel -E wd1
#printf "a\n\n\n\nRAID\nw\nq\n\n" | disklabel -E wd2
#printf "a\n\n\n\nRAID\nw\nq\n\n" | disklabel -E wd3
#bioctl -c 5 -l /dev/wd0a,/dev/wd1a,/dev/wd2a,/dev/wd3a softraid0
sd1 at scsibus3 targ 1 lun 0: <OPENBSD, SR RAID 5, 004> SCSI2 0/direct
fixed
sd1: 5723178MB, 512 bytes/sector, 11721070080 sectors
#dd if=/dev/zero of=/dev/rsd1c bs=1m count=1
#fdisk -iy sd1
This give me....
# fdisk -e sd1
Enter 'help' for information
fdisk: 1> p
Disk: sd1 geometry: 729602/255/63 [3131135488 Sectors]
Offset: 0 Signature: 0xAA55
Starting Ending LBA Info:
#: id C H S - C H S [ start: size ]
-------------------------------------------------------------------------------
0: 00 0 0 0 - 0 0 0 [ 0: 0 ]
unused
1: 00 0 0 0 - 0 0 0 [ 0: 0 ]
unused
2: 00 0 0 0 - 0 0 0 [ 0: 0 ]
unused
*3: A6 0 1 2 - 194903 76 55 [ 64: 3131121474 ]
OpenBSD
Then I try and partition the disk.....
# disklabel -E sd1
Label editor (enter '?' for help at any prompt)
> a a
offset: [64]
size: [3131121474]
FS type: [4.2BSD]
> p T
OpenBSD area: 64-3131121538; size: 1.5T; free: 0.0T
# size offset fstype [fsize bsize cpg]
a: 1.5T 64 4.2BSD 8192 65536 1
c: 5.5T 0 unused
>
It seems like an fdisk issue to me. If I just use one 2TB sata disk and
create the biggest partition I can using fdisk then I get a 1.8TB
partition. If I do the same on a softraid (raid 5) partition using 4 of
the 2TB disks the biggest partition I can make is just 1.5TB but the
actual softraid disk is apparently 5723178MB (5.4TB)
I was trying to get some details from fdisk to put here but i've just
run "fdisk -i sd0" on the wrong disk and trashed the boot disk!!!! I
can't run the reboot command either as it just gives "Segmentation fault".
Keith
