Migrate Host to new Boot Disk

[blackpaw]

I have a three node proxmox cluster setup. The two main nodes are both booting off Samsung SSD 840 EVO's. In retrospect, not a good choice

Both SSD's have been effected by the firmware slow read performance bug and one can't be upgraded to the firmware "fix".

I want to replace them with Intel 520's or 530's. Can I just do a image backup and restore, then swap the SSD's? I was thinking of using a CloneZilla bootable USB to backup the host to a share, then restore to the Intel 520.

NB:Both hosts are also Ceph Mon and OSD Nodes.

Thanks.

 

[udo]

Hi,
you can do that no the fly (only on restart if you have hotplug for the new SSD).

Hot plug the new SSD and create the boot + lvm partition.
format the new boot partition, mount them and copy the content
like

mkdir /mnt/boot
mount /dev/sdX1 /mnt/boot
cd /boot
tar cf - . | (cd /mnt/boot; tar xfBp -)
umount /mnt/boot

Extend the pve-vg with the second SSD-partion and use pvmove do move all LVs to the new SSD.
Reduce the pve-vg (remove the old SSD-partition from the VG)
write the boot-block to the new SSD

restart and remove art the same time the old SSD - finish!

Udo

 

[udo]

One point missed: Use the new UUID (new SSD) from /boot in /etc/fstab and do an "mount -a" to see if it's work.

Then update-grub2...

Udo

 

[blackpaw]

Hi Udo, thanks for the detailed reply and my apologies for my lateness - I missed the notification

My LV skills are weak but I'll give it a spin. Definitely backup the disk with clonezilla first though

Soome questions:
- Your first step, formatting and mounting the SSD, does it matter what filesystem I use?
- should I just partition it as one big EXT4 Partition?
- Is Ext4 still the recommended FS for SSD's?
- One of the servers was installed with EXT3, which was the default when I did it So another good reason for this.


update-grub2
- I presume I have to do that before rebooting
- It will just pickup the new boot disk?

Thanks. Bit nerve wracking, will be doing it all this Sunday. Doubling the RAM to 64GB, new and better SSD's, system should be flying!

 

[udo]

Hi Udo, thanks for the detailed reply and my apologies for my lateness - I missed the notification

My LV skills are weak but I'll give it a spin. Definitely backup the disk with clonezilla first though

Hi,
a good valid backup is allways an good idea

Soome questions:
- Your first step, formatting and mounting the SSD, does it matter what filesystem I use?
- should I just partition it as one big EXT4 Partition?
- Is Ext4 still the recommended FS for SSD's?
- One of the servers was installed with EXT3, which was the default when I did it So another good reason for this.

formatting and mounting is the first step for the boot-partition only.

The other space is used by the lvm-storage (pve).
for /boot I would use ext3 - the root partition don't change, because you move them with pvmove to the SSD (if you take my suggestion).

Depends on your SSD if you need TRIM (ext4). If you have an Intel DC S3700 you don't need TRIM.

update-grub2
- I presume I have to do that before rebooting

right.

- It will just pickup the new boot disk?

forget, you need the bootblk installed before with

grub-install /dev/SSD*

* sdb/sdc/sde...

Thanks. Bit nerve wracking, will be doing it all this Sunday. Doubling the RAM to 64GB, new and better SSD's, system should be flying!

Too late for me - on Sunday I'm in London, so I can't support if any trouble occur...

but perhaps someone else in this forum.

Udo

 

[blackpaw]

Thanks Udo, feedback much appreciated.

Depends on your SSD if you need TRIM (ext4). If you have an Intel DC S3700 you don't need TRIM.

Intel 535 120GB. TBH I don't know - I presume the S3700 supports it in its controller? I doubt the 535 does, its just a SATA connection.