Greetings!
Please have a look at the RAIDs in one of my servers.
The story:
Initially it came with 4x500 GB ( /dev/sd[a-d] ).
I started with md1 for boot, a raid5+s md3 for root and a raid5+s md4 as
the one and only physical volume in the LVM volume group "VG01".
Classic stuff ;-)
As usual the server was used and got filled up.
The box has 8 hdd-slots so we bought 4 x 1 TB to add them. But
unfortunately the SATA-controller onboard only has 6 channels!
*sigh*
So I was only able to add 2x1TB at first.
At this point I should have planned better and maybe start off with a
degraded RAID6 or so :-(
I created /dev/md5 as a mirror only ....
Now lately I added another SATA-controller and /dev/sdg and sdh, built a
mirror /dev/md6 and added this as the second PV to the VG "pipe"
"pipe" now consists of 2 mirrors, each containing 2x1TB ...
As you may understand I am not so happy with this.
I would like to rebuild things now, heading for RAID6 or so, as there is
quite important data stored on this box.
I perfectly know that I should have planned things better, YES!
-
So what I now have is 4x ~472 GB in the partitions /dev/sd[a-d]4 and 4x
~980 GB in the partitions /dev/sd[e-h]1 ...
For sure we now have data on the box ...
Any good suggestions how to proceed?
Should I head for building a RAID6 out of [a-d] and [e-h] each ... ?
What would be the recommended setup here in your opinion?
Thanks for any thoughts on this, Stefan
----------> info from here
mdadm 3.1.4 available
Currently kernel 2.6.27, but 2.6.34 ready to boot (I have to attach that
KVM before I do that).
# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4]
md6 : active raid1 sdh1[1] sdg1[0]
976759936 blocks [2/2] [UU]
md1 : active raid1 sdb1[1] sda1[0]
104320 blocks [2/2] [UU]
md4 : active raid5 sdd4[2] sdc4[3](S) sdb4[1] sda4[0]
944300544 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
md5 : active raid1 sdf1[1] sde1[0]
976759936 blocks [2/2] [UU]
md3 : active raid5 sdd3[3](S) sdc3[2] sdb3[1] sda3[0]
31262336 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
# pvdisplay
--- Physical volume ---
PV Name /dev/md5
VG Name pipe
PV Size 931.51 GiB / not usable 3.12 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 238466
Free PE 0
Allocated PE 238466
PV UUID OWAXnx-Lhxo-91kY-x7Pq-8riP-OMga-qP09dn
--- Physical volume ---
PV Name /dev/md6
VG Name pipe
PV Size 931.51 GiB / not usable 3.12 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 238466
Free PE 123652
Allocated PE 114814
PV UUID yqpOBG-PSP1-kjKg-hK9l-xOWA-Gku6-Flxqo0
--- Physical volume ---
PV Name /dev/md4
VG Name VG01
PV Size 900.56 GiB / not usable 512.00 KiB
Allocatable yes
PE Size 4.00 MiB
Total PE 230542
Free PE 5120
Allocated PE 225422
PV UUID 7rjtme-VisO-n2FH-fLH5-WGCs-KqD1-B7A6eu
# fdisk -l /dev/sd?
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sda1 1 13 104391 fd Linux raid
autodetect
/dev/sda2 14 75 498015 82 Linux swap /
Solaris
/dev/sda3 76 2021 15631245 fd Linux raid
autodetect
/dev/sda4 2022 60801 472150350 fd Linux raid
autodetect
Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdb1 1 13 104391 fd Linux raid
autodetect
/dev/sdb2 14 75 498015 82 Linux swap /
Solaris
/dev/sdb3 76 2021 15631245 fd Linux raid
autodetect
/dev/sdb4 2022 60801 472150350 fd Linux raid
autodetect
Disk /dev/sdc: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdc1 1 13 104391 fd Linux raid
autodetect
/dev/sdc2 14 75 498015 82 Linux swap /
Solaris
/dev/sdc3 76 2021 15631245 fd Linux raid
autodetect
/dev/sdc4 2022 60801 472150350 fd Linux raid
autodetect
Disk /dev/sdd: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdd1 1 13 104391 fd Linux raid
autodetect
/dev/sdd2 14 75 498015 82 Linux swap /
Solaris
/dev/sdd3 76 2021 15631245 fd Linux raid
autodetect
/dev/sdd4 2022 60801 472150350 fd Linux raid
autodetect
Disk /dev/sde: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x1188d9cb
Device Boot Start End Blocks Id System
/dev/sde1 1 121601 976760001 fd Linux raid
autodetect
Disk /dev/sdf: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xa2f780d9
Device Boot Start End Blocks Id System
/dev/sdf1 1 121601 976760001 fd Linux raid
autodetect
Disk /dev/sdg: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x7e846a1d
Device Boot Start End Blocks Id System
/dev/sdg1 1 121601 976760001 fd Linux raid
autodetect
Disk /dev/sdh: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x264cbf63
Device Boot Start End Blocks Id System
/dev/sdh1 1 121601 976760001 fd Linux raid
autodetect
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