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Re: Advice sought re HDD --> SSD migration

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On 06/04/2016 04:11 AM, Mark Fletcher wrote:
> I've recently decided to upgrade my main PC, running Debian Jessie, to use
> SSDs instead of HDDs. ...
> The machine is a self-built circa 2009 machine with an Intel Core i7-920
> processor, 24GB of RAM ... 1 500GB disk which
> contained the whole filesystem except /opt with multiple partitions, and 1
> 1TB disk which is mounted on /opt.
...
> The migration was easy for the /opt disk -- just install the SSD, partition
> it, create an ext4 filesystem on it, mount it somewhere temporary, copy
> everything over from the /opt harddisk, and modify fstab ...
> I've got a feeling though that the main disk is going to be a bit more of a
> challenge, and that is what I want advice about. I'm thinking I should boot
> from a live image and effect the copy there so that the disk is not mounted
> and in active use. Is that along the right lines or is there a better way?
>
> The replacement SSD is 960GB where the original hard disk is 500GB. Would
> you recommend a dd if=/dev/sda of=/dev/sdd (or whatever it turns out to
> be), or a cp -r command like I used for the /opt disk, or some other way to
> execute the migration?
>
> One complication is when I originally partitioned the 500GB disk I may have
> overdone it a bit. I've got separate partitions for /boot, /usr, /home,
> /tmp, /var, swap space and the root partition. I now consider that I
> overdid that and would ideally like to collapse /usr, /tmp and /var into
> the (correpondingly bigger) root partition, ie not have separate partitions
> for them and end up with root, /boot and /home (BIOS is too old for UEFI so
> using MBR booting so /boot partition makes sense). But, if trying to do so
> is going to make life significantly harder, I can accept not doing so --
> but I do want to make full use of the available space on the new device so
> the partitions will not be the same size as they were.
>
> What other things should I be concerned about (for example the discussion
> about ping using capabilities that was on this list a day or two back)? Oh,
> and speaking of MBR, as I was a paragraph ago, anything I should watch out
> for when trying to make the SSD bootable?
>
> And anything else I should bear in mind when migrating to SSDs on a system
> that was originally installed on HDDs?
...
> The SSDs are recently-bought SanDisk Ultra II 960GB devices, ...

I assume you've implemented backup, restore, imaging, archiving, etc..


dd'ing the 500 GB onto the second SSD should work.


But, if it were my box:

1.  Buy a 16+ GB SSD to use as the i7-920 system drive, install and 
connect to motherboard SATA-0 port (dev/sda), and do a fresh install 
with MBR and three partitions -- ext4 boot, LUKS random key swap, and 
LUKS btrfs root.

2.  Install the two 960 GB SSD's.  Set up each with GPT partition table, 
one large partition, and LUKS.  Put RAID1 copy-on-write (COW) file 
system on top -- mdadm RAID1 plus btrfs, LVM RAID1 plus btrfs, btrfs 
with RAID1 (if supported), or ZFS on Linux (ZOL) mirror.

3.  If you choose ZOL, leave space on the system drive, add a fourth 
partition with LUKS, and use it for the L2ARC.

4. If you're going to use this as a headless SOHO file server, a USB 3.0 
flash drive could work as your system drive.  If you do this and also 
choose ZOL, it would be best to use another USB 3.0 flash drive for the 
L2ARC.



David

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Thread

Advice sought re HDD --> SSD migration Mark Fletcher <mark27q1@gmail.com> - 2016-06-04 13:20 +0200
  Re: Advice sought re HDD --> SSD migration Dan Purgert <dan@djph.net> - 2016-06-04 14:40 +0200
    Re: Advice sought re HDD --> SSD migration Stefan Monnier <monnier@iro.umontreal.ca> - 2016-06-04 21:00 +0200
  Re: Advice sought re HDD --> SSD migration David Christensen <dpchrist@holgerdanske.com> - 2016-06-04 22:40 +0200
    Re: Advice sought re HDD --> SSD migration Mark Fletcher <mark27q1@gmail.com> - 2016-06-05 13:50 +0200
      Re: Advice sought re HDD --> SSD migration Felix Miata <mrmazda@earthlink.net> - 2016-06-05 14:40 +0200
        Re: Advice sought re HDD --> SSD migration Mark Fletcher <mark27q1@gmail.com> - 2016-06-05 15:20 +0200
          Re: Advice sought re HDD --> SSD migration <tomas@tuxteam.de> - 2016-06-05 15:50 +0200
        Re: Advice sought re HDD --> SSD migration David Wright <deblis@lionunicorn.co.uk> - 2016-06-05 16:10 +0200
          Re: Advice sought re HDD --> SSD migration Mark Fletcher <mark27q1@gmail.com> - 2016-06-05 17:00 +0200
      Re: Advice sought re HDD --> SSD migration David Christensen <dpchrist@holgerdanske.com> - 2016-06-06 00:30 +0200
        Re: Advice sought re HDD --> SSD migration Mark Fletcher <mark27q1@gmail.com> - 2016-06-09 16:20 +0200
          Re: Advice sought re HDD --> SSD migration David Wright <deblis@lionunicorn.co.uk> - 2016-06-09 20:40 +0200
          Re: Advice sought re HDD --> SSD migration Jonathan Dowland <jmtd@debian.org> - 2016-06-10 12:20 +0200
            Re: Advice sought re HDD --> SSD migration Mark Fletcher <mark27q1@gmail.com> - 2016-06-10 16:30 +0200
  Re: Advice sought re HDD --> SSD migration Jonathan Dowland <jmtd@debian.org> - 2016-06-10 12:30 +0200

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