Multiple hdd or Raid

[Bora]

Hello,

I have a server with 2 x 500 GB HDDs.

However when I install proxmox, it only uses the first disk and not the 2nd disk.

Is it possible to make them software raid or LVM or any way to utilize both disks?

 

[dietmar]

First, you should really use a HW Raid controller - SW Raid is not supported for various reasons (see forum).

LVM is used by default, so you can simply add the second disk after installation (and expand the filesystem/LV named /dev/pve/data)

- Dietmar

 

[Bora]

Would a raid controller without battery backup work?

I don't really care about software raid, I just want to be able to utilize both disks, without much pain.

 

[dietmar]

Would a raid controller without battery backup work?

It works, but you can loose data in the cache then (on power failure).

 

[Bora]

Ok, but I can still add the 2nd drive to the LVM partition right?

 

[dietmar]

I dont understand that question?

 

[Bora]

First, you should really use a HW Raid controller - SW Raid is not supported for various reasons (see forum).

LVM is used by default, so you can simply add the second disk after installation (and expand the filesystem/LV named /dev/pve/data)

- Dietmar

So from what I understand you are using LVM by default for the first drive, and if I add a 2nd drive I can simpoly expand the filesystem named /dev/pve/data and utilize both disks.. (without having a hardware raid controller or doing software raid) correct?

 

[dietmar]

So from what I understand you are using LVM by default for the first drive, and if I add a 2nd drive I can simpoly expand the filesystem named /dev/pve/data and utilize both disks.. (without having a hardware raid controller or doing software raid) correct?

yes.

 

[Bora]

Thank you! have a wonderful day.

 

[yaroslavukr]

Help please. What are the commands in ssh you can do it. Many thanks in advance!

 

[udo]

Hi yaroslavukr,
i hope it's only a test-system?
For the first overview:

# pvdisplay
# vgdisplay

and

# lvdisplay

first make a partition on the second disk (e.g. sdb1) from type 8e - than

pvcreate /dev/sdb1

after that, you can extend your volumegroup:

# vgextend pve /dev/sdb1
# vgdisplay pve

look at vg-size and free size

now you can extend your logicalvolume (e.g. 100GB bigger)

lvextend -L +100G /dev/pve/data

attention - min. free in vg is 4GB (for backup).
Final you must expand your filesystem:

resize2fs /dev/pve/data

Please use the man-pages, i have wrote this out my mind (perhaps something is wrong).

Udo

 

[udo]

double post due browser controls (site back)

 

[yaroslavukr]

Hi yaroslavukr,

now you can extend your logicalvolume (e.g. 100GB bigger)

lvextend -L +100G /dev/pve/data

attention - min. free in vg is 4GB (for backup).
Final you must expand your filesystem:

resize2fs /dev/pve/data

Please use the man-pages, i have wrote this out my mind (perhaps something is wrong).

Udo

udo, if I have a second 500 gb hdd that I need to execute a command like this:

vextend -L +500G /dev/pve/data

 

[udo]

Hi,
yes, you will add 500G more space with "lvextend -L +500G ..." but look before at the output from vgdisplay. Normaly the HDs are smaller, than the manufacture said (eg. 480GB not 500GB). Because the HDs use 1GB=1000*1000k and not 1024*1024. Its absolute important, that minimum 4GB free after the expansion - or your backup don't work!!

Udo

 

[yaroslavukr]

Hi,
yes, you will add 500G more space with "lvextend -L +500G ..." but look before at the output from vgdisplay. Normaly the HDs are smaller, than the manufacture said (eg. 480GB not 500GB). Because the HDs use 1GB=1000*1000k and not 1024*1024. Its absolute important, that minimum 4GB free after the expansion - or your backup don't work!!

Udo

udo, you have icq, skype or e-mail. I really need your help. Please help. Thanks

 

[yaroslavukr]

udo, please help.

pvcreate /dev/sdb1
Device /dev/sdb1 not found (or ignored by filtering).

((

 

[udo]

Hi,
for the emailadress look at visitor messages from your account.
If you are fast - i can help today...

Udo