Got my new 256GB SSD yesterday.
Since I was moving from a larger drive to a smaller one this one made me a bit more nervous that other hard drive replacements.
I used System Rescue CD to do all the work with a combination of gparted and lvm tools. I'm not sure if anyone is interested in the details but I'll summarize here.
After installing the new drive I booted Sys Rec CD from USB, started X and gparted.
Then I initialized the drive using GPT (more on that later).
I shrunk my /boot partition from 1GB to 500MB then moved it over to the new drive as partition 1. That only took 2 seconds.
Next I had to shrink the root and var volume groups and file systems. I found out that the lvm tools will call fsadm for you and do the dirty work. This was very convenient as I didn't know how much space (if any) was lost for the LVM, i.e., does a 25GB filesystem fit perfectly in a 25GB LV?
I shrunk root from 30GB to 25GB (i'm only using about 20G and it shouldn't grow much). This took less than a minute.
Next I shrunk my var fs & LV from over 400GB to 200GB (make sure it would fit). I'm only using 190GB. This took a while.
Then I used vgexpand to add the new drive partition 2 to the existing volume group and used pvmove to move all the data off the old PV. This also took a while.
After that I used vgreduce to drop the old LV and then resized both the LV and file system to take up the remainder of the drive.
Since my fstab references /boot through UUID and gparted copied it over there was nothing to update there.
One thing I FORGOT about was to install grub2 onto the MBR of the new drive, so what do you know, the system would boot.
So re-booted back into SysRecCD to attempt this, here's where things got scary!
First, I found out you have to chroot onto your new system so when grub installs to the MBR it has access to /boot of the host system. Here's the basic steps here:
Even that failed because I had chosen a GPT partitioning system and didn't know I needed a small (1MB) partition at the beginning of the drive. I can't find the link where I found the information but I did it like this:
- Resized /sdX1 down 1MB from the FRONT of the partition.
- Added a 1MB primary partition to the front of the disk, ended up being /dev/sdX3
- Mark the partition "bios_grub".
Then I remounted the host system again and this time grub-install worked.
Now it boots and runs blazing fast! I still need to tweak the mount options but I'll do that tonight, was up past midnight messing with it last night.
Thanks,
Richard
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