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Dear Chris!
Certainly: I have 3 HDDs, all of which WD20EARS. Originally I wanted to
let btrfs handle all 3 devices directly without making partitions, but
this was impossible, as at least /boot needed to be ext4, at least back
then when I set up the server. And back then btrfs also hadn't raid5-like
functionality, so I decided to put good old partitions and md-Raids and
LVM on them and use btrfs just as plain file-systems on the partitions
provided by LVM.
On the WD disks I thus created 2 partitions each, the first sdX1 being
~500MiB, the rest, 1.9995 TiB is one partition of, sdX2.
I built a Raid1 on the 3 small partitions sdX1 with ext4 for boot, each
disk is bootable with grub installed into the MBR.
I combined the 3 large partitions to a Raid5 of size 3,64TB:
/proc/mdstat reads:
md0 : active raid1 sda1[5] sdb1[4] sdc1[3]
498676 blocks super 1.2 [3/3] [UUU]
md1 : active raid5 sda2[5] sdb2[4] sdc2[3]
3904907520 blocks super 1.2 level 5, 8k chunk, algorithm 2 [3/3] [UUU]
the information you requested:
# sudo mdadm -D /dev/md1
/dev/md1:
Version : 1.2
Creation Time : Thu Jul 14 18:49:25 2011
Raid Level : raid5
Array Size : 3904907520 (3724.01 GiB 3998.63 GB)
Used Dev Size : 1952453760 (1862.01 GiB 1999.31 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Sun Jan 5 22:07:22 2014
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 8K
Name : freedom:1 (local to host freedom)
UUID : 44b72520:a78af6f7:dba13fb3:2203127d
Events : 576884
Number Major Minor RaidDevice State
4 8 18 0 active sync /dev/sdb2
5 8 2 1 active sync /dev/sda2
3 8 34 2 active sync /dev/sdc2
I use the Raid5 md1 as physical volume for LVM: pvdisplay gives:
--- Physical volume ---
PV Name /dev/md1
VG Name MAIN
PV Size 3.64 TiB / not usable 2.06 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 953346
Free PE 6274
Allocated PE 947072
PV UUID WcuEx8-ehJL-xHdf-ElwF-b9s3-dlmM-KZlDNG
I keep a reserve of 6274 4MiB blocks (=24GiB) in case one of the logical
volumes runs out of space...
I created the following logical volumes, named after their intended
mountpoints:
--- Logical volume ---
LV Path /dev/MAIN/ROOT
LV Name ROOT
VG Name MAIN
LV UUID kURJks-xHox-73B5-n02x-eZfS-agDD-n1dtAm
LV Write Access read/write
LV Creation host, time ,
LV Status available
# open 1
LV Size 19.31 GiB
Current LE 4944
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:0
and similar:
--- Logical volume ---
LV Path /dev/MAIN/SWAP: 1.8GB
LV Path /dev/MAIN/HOME: 18.6GB
LV Path /dev/MAIN/TMP: 9.3 GB
LV Path /dev/MAIN/DATA1 2.6 TB
LV Path /dev/MAIN/DATA2: 0.9 TB
as filesystem I used btrfs during install form an ubuntu server, I don't
recall which, might have been 11.10 or 12.04 (?) for all logical
partitions except swap, of course,
any other information I can supply?
regards, Sulla
- --
Cogito cogito ergo cogito sum.
Ambrose Bierce
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