Hey Guys,
I have made a huge mistake with my server configuration and getting now really in trouble. I'm running a WHM/cPanel server on my CentOS, it's a production server with some websites on.
My root partitions "/" is running out of space and i need immediately to do something.
Resize RAID partitions is a task above my abilities so i start to read everything about it. Unfortunately this is very complected so maybe you guys can help.
In this step of my research & learn process i have found out what i need to do, but the how is very complected.
My server has two partitions:
/dev/md2: 21,0GB
/dev/md3: 1979GB
Unfortunately md2 is the root partition and to resize it, the server needs to got in the "rescue mode" which means in the end a longer down time.
So I decide to shrink md3 and make two new partition for /var and /usr.
On this point a few server prints:
Code:
root@ns506372 [~]# df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 20G 17G 1,9G 91% /
/dev/root 20G 17G 1,9G 91% /
devtmpfs 32G 276K 32G 1% /dev
/dev/md3 1,8T 76G 1,7T 5% /home
tmpfs 32G 0 32G 0% /dev/shm
/dev/root 20G 17G 1,9G 91% /var/tmp
/dev/root 20G 17G 1,9G 91% /var/named/chroot/etc/named
/dev/root 20G 17G 1,9G 91% /var/named/chroot/etc/named.rfc1912.zones
/dev/root 20G 17G 1,9G 91% /var/named/chroot/etc/rndc.key
/dev/root 20G 17G 1,9G 91% /var/named/chroot/usr/lib64/bind
/dev/root 20G 17G 1,9G 91% /var/named/chroot/etc/named.iscdlv.key
/dev/root 20G 17G 1,9G 91% /var/named/chroot/etc/named.root.key
ftpback-XXXXXX.net:/export/ftpbackup/XXXXXXXX.net 500G 196G 305G 40% /backup
Code:
cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty]
md2 : active raid1 sdb2[1] sda2[0]
20478912 blocks [2/2] [UU]
md3 : active raid1 sdb3[1] sda3[0]
1932506048 blocks [2/2] [UU]
Code:
root@ns506372 [~]# mdadm --misc --detail /dev/md2
/dev/md2:
Version : 0.90
Creation Time : Tue Sep 16 13:52:02 2014
Raid Level : raid1
Array Size : 20478912 (19.53 GiB 20.97 GB)
Used Dev Size : 20478912 (19.53 GiB 20.97 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 2
Persistence : Superblock is persistent
Update Time : Tue Nov 18 13:58:11 2014
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 94c54da7:d37eee63:a4d2adc2:26fd5302
Events : 0.152
Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 8 18 1 active sync /dev/sdb2
Code:
root@ns506372 [~]# mdadm --misc --detail /dev/md3
/dev/md3:
Version : 0.90
Creation Time : Tue Sep 16 13:52:03 2014
Raid Level : raid1
Array Size : 1932506048 (1842.98 GiB 1978.89 GB)
Used Dev Size : 1932506048 (1842.98 GiB 1978.89 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 3
Persistence : Superblock is persistent
Update Time : Tue Nov 18 13:58:19 2014
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 52bfd18b:4f959e4d:a4d2adc2:26fd5302
Events : 0.830
Number Major Minor RaidDevice State
0 8 3 0 active sync /dev/sda3
1 8 19 1 active sync /dev/sdb3
Code:
root@ns506372 [~]# parted -l
Modell: ATA HGST HUS724020AL (scsi)
Festplatte /dev/sda: 2000GB
Sektorgröße (logisch/physisch): 512B/512B
Partitionstabelle: gpt
Nummer Anfang Ende Größe Dateisystem Name Flags
1 20,5kB 1049kB 1029kB primary bios_grub
2 2097kB 21,0GB 21,0GB ext3 primary raid
3 21,0GB 2000GB 1979GB ext3 primary raid
4 2000GB 2000GB 536MB linux-swap(v1) primary
Modell: ATA HGST HUS724020AL (scsi)
Festplatte /dev/sdb: 2000GB
Sektorgröße (logisch/physisch): 512B/512B
Partitionstabelle: gpt
Nummer Anfang Ende Größe Dateisystem Name Flags
1 20,5kB 1049kB 1029kB primary bios_grub
2 2097kB 21,0GB 21,0GB ext3 primary raid
3 21,0GB 2000GB 1979GB ext3 primary raid
4 2000GB 2000GB 536MB linux-swap(v1) primary
Modell: Unbekannt (unknown)
Festplatte /dev/md2: 21,0GB
Sektorgröße (logisch/physisch): 512B/512B
Partitionstabelle: loop
Nummer Anfang Ende Größe Dateisystem Flags
1 0,00B 21,0GB 21,0GB ext3
Modell: Unbekannt (unknown)
Festplatte /dev/md3: 1979GB
Sektorgröße (logisch/physisch): 512B/512B
Partitionstabelle: loop
Nummer Anfang Ende Größe Dateisystem Flags
1 0,00B 1979GB 1979GB ext3
It's a GPT (GUID Partition Table) System.
I have found this tutorial to Shrink & Grow a Software RAID, but I'm not sure if this gone work for me.
http://www.howtoforge.com/how-to-res...-software-raid
By the side the tutorial is from 2008.
Falko describes the usage of mdadm and resize2fs, but i don't get the point of how mdadm and resize2fs working together.
The other question is, if I'm using "mdadm --grow /dev/md3 --size=XXX" dose it effect on both disks?
I'm trying to get this result:
md02 = 20GB = mount on /
md03 = 1TB = mount on /home
md04 = 500GB = mount on /var
md05 = 250GB = mount on /usr
I'm happy about every advice.