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{{level|Advanced}}
{{level|Advanced}}
Source of this page is the [https://raid.wiki.kernel.org/index.php/Growing raid wiki]
Source of this page is the [https://raid.wiki.kernel.org/index.php/Growing raid wiki]. This is the [http://forums.contribs.org/index.php/topic,50311.0 initial forum post] which gives the need to write the the howto
The purpose of this HOWTO is to add a new drive to an existing Raid5 with LVM, LVM is the standard installation of SME Server. Please backup your data before starting this HOWTO, '''or you may loose the lot'''.
The purpose of this HOWTO is to add a new drive to an existing Raid5 with LVM, LVM is the standard installation of SME Server. Please backup your data before starting this HOWTO, '''or you may loose the lot'''.
===Adding partitions===
===Adding partitions===
{{Note box|msg=The process can take many hours or even days. There is a critical section at start, which cannot be backed up. To allow recovery after unexpected power failure, an additional option <code>--backup-file=</code> can be specified. Make sure this file is on a different disk or it defeats the purpose.
mdadm --grow --raid-devices=5 --backup-file=/root/grow_md1.bak /dev/md1
mdadm --grow --raid-devices=4 --backup-file=/root/grow_md2.bak /dev/md2}}
Now we need to add the first partition /dev/sde1 to /dev/md1
Now we need to add the first partition /dev/sde1 to /dev/md1
Here we use the option --raid-devices='''5''' because raid1 uses all drives. You can see how the array looks by:
Here we use the option --raid-devices='''5''' because raid1 uses all drives. You can see how the array looks by:
{{Warning box|During the raid growing step you DO not shutdown your computer, or experienced an electrical failure, these issues can let your computer in a badly status and you can loose your data}}
[root@smeraid5 ~]# mdadm --detail /dev/md1
[root@smeraid5 ~]# mdadm --detail /dev/md1
/dev/md1:
/dev/md1:
mdadm: ... critical section passed.
mdadm: ... critical section passed.
{{tip box|msg=You need to keep --raid-devices='''4''' if you want to have an array of 4 drives+1spare, However if you do not want a spare drive, you should set --raid-devices='''5'''}}
{{tip box|msg=You need to keep --raid-devices='''4''' if you want to have an array of 4 drives+1spare, However if you do not want a spare drive, you should set --raid-devices='''5'''. This command can be used to grow an array of raid on the spare drive, just say to mdadm that you want to use all disks connected to the computer.}}
{{Warning box|During the raid growing step you DO not shutdown your computer, or experienced an electrical failure, these issues can let your computer in a badly status and you can loose your data}}
we can take a look to the md2 array
we can take a look to the md2 array
0 8 2 0 active sync /dev/sda2
0 8 2 0 active sync /dev/sda2
1 8 18 1 active sync /dev/sdb2
1 8 18 1 active sync /dev/sdb2
3 8 34 2 active sync /dev/sdd2
3 8 34 2 active sync /dev/sdc2
4 8 50 3 active sync /dev/sde2
4 8 50 3 active sync /dev/sde2
2 8 114 - spare /dev/sdc2
2 8 114 - spare /dev/sdd2
===LVM: Growing the PV===
===LVM: Growing the PV===
Once the construction is complete, we have to set the LVM to use the whole space
{{Note box|Once the construction is complete, we have to set the LVM to use the whole space}}
* In a root terminal, issue the following command lines
[root@smeraid5 ~]# pvresize /dev/md2
[root@smeraid5 ~]# pvresize /dev/md2
1 physical volume(s) resized / 0 physical volume(s) not resized
1 physical volume(s) resized / 0 physical volume(s) not resized
after that we can resize the LVM
* after that we can resize the LVM
[root@smeraid5 ~]# lvresize -l +100%FREE /dev/main/root
[root@smeraid5 ~]# lvresize -l +100%FREE /dev/main/root
Performing an on-line resize of /dev/main/root to 19726336 (4k) blocks.
Performing an on-line resize of /dev/main/root to 19726336 (4k) blocks.
You should verify that your LVM use the whole drive space with the command
* You should verify that your LVM use the whole drive space with the command
On Koozali SME v10 you should use xfs_growfs instead of resize2fs
[root@smev10~]# xfs_growfs /dev/main/root
meta-data=/dev/mapper/main-root isize=512 agcount=4, agsize=1854976 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=7419904, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=3623, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 7419904 to 11615232
[root@smeraid5 ~]# pvdisplay
[root@smeraid5 ~]# pvdisplay