Hi Niki,
md127 apparently only uses 81.95GB per disk. Maybe one of the partitions has the wrong size. What's the output of lsblk?
Regards
Michael
----- Ursprüngliche Mail -----
Von: "Niki Kovacs" <info@xxxxxxxxxxxxx>
An: "CentOS mailing list" <CentOS@xxxxxxxxxx>
Gesendet: Mittwoch, 18. Februar 2015 08:09:13
Betreff: CentOS 7: software RAID 5 array with 4 disks and no spares?
Hi,
I just replaced Slackware64 14.1 running on my office's HP Proliant
Microserver with a fresh installation of CentOS 7.
The server has 4 x 250 GB disks.
Every disk is configured like this :
* 200 MB /dev/sdX1 for /boot
* 4 GB /dev/sdX2 for swap
* 248 GB /dev/sdX3 for /
There are supposed to be no spare devices.
/boot and swap are all supposed to be assembled in RAID level 1 across 4
disks.
The / partition is supposed to be assembled in RAID level 5 across 4 disks.
With Slackware I created the arrays manually like this:
# mdadm --create /dev/md1 --level=1 --raid-devices=4 --metadata=0.90
/dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1
# mdadm --create /dev/md2 --level=1 --raid-devices=4 --metadata=0.90
/dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2
# mdadm --create /dev/md3 --level=5 --raid-devices=4 --metadata=0.90
/dev/sda3 /dev/sdb3 /dev/sdc3 /dev/sdd3
Using this setup, I had 650 MB of disk space on /dev/md3.
Now I tried to do the same thing with CentOS 7. Everything seemed to
work at first, but here's what I got now:
[root@nestor:~] # df -h
Sys. de fichiers Taille Utilisé Dispo Uti% Monté sur
/dev/md127 226G 1,1G 213G 1% /
devtmpfs 1,4G 0 1,4G 0% /dev
tmpfs 1,4G 0 1,4G 0% /dev/shm
tmpfs 1,4G 8,5M 1,4G 1% /run
tmpfs 1,4G 0 1,4G 0% /sys/fs/cgroup
/dev/md125 194M 80M 101M 45% /boot
/dev/sde1 917G 88M 871G 1% /mnt
The root partition (/dev/md127) only shows 226 G of space. So where has
everything gone?
[root@nestor:~] # cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4]
md125 : active raid1 sdc2[2] sdd2[3] sdb2[1] sda2[0]
204736 blocks super 1.0 [4/4] [UUUU]
md126 : active raid1 sdd1[3] sdc1[2] sdb1[1] sda1[0]
4095936 blocks super 1.2 [4/4] [UUUU]
md127 : active raid5 sdc3[2] sdb3[1] sdd3[4] sda3[0]
240087552 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4]
[UUUU]
bitmap: 0/1 pages [0KB], 65536KB chunk
unused devices: <none>
[root@nestor:~] # mdadm -D /dev/md127
/dev/md127:
Version : 1.2
Creation Time : Wed Feb 18 06:49:01 2015
Raid Level : raid5
Array Size : 240087552 (228.97 GiB 245.85 GB)
Used Dev Size : 80029184 (76.32 GiB 81.95 GB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Wed Feb 18 08:04:26 2015
State : active
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : localhost:root
UUID : cfc13fe9:8fa811d8:85649402:58c4846e
Events : 4703
Number Major Minor RaidDevice State
0 8 3 0 active sync /dev/sda3
1 8 19 1 active sync /dev/sdb3
2 8 35 2 active sync /dev/sdc3
4 8 51 3 active sync /dev/sdd3
Apparently no spare devices have been created. So why do I only have 226
GB of disk space under CentOS, when I had roughly 650 GB under Slackware?
I'm a bit lost here. Any suggestions?
Cheers,
Niki
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