[olug] Mirroring a boot drive
justin at hotlinesinc.com
Thu Sep 27 08:02:49 CDT 2018
Periodically dd your drive and compress it to another location, then you
can just dd it to a new drive the same or larger in size.
Honestly, I'm not sure the best way to do it from a live system, it's been
a long time since I have used software raid, everything I have has a raid
I remember horror stories of software raid screwing up when we used it, not
being able to replace drives, no documentation, and onsite helping hands
Someone here might know.
If I had to do it, I'd buy a pci express raid card, do a full backup, buy a
couple new SSDs and dd the info back on to the new raid, but I am almost
positive someone here might have a more elegant solution.
On Wed, Sep 26, 2018 at 10:40 PM Ben Hollingsworth <obiwan at jedi.com> wrote:
> I've got a Ubuntu system (currently 16.04, but soon 18.04) with a
> single, 5.5-yr-old SSD boot/root drive and a handful of other disks in a
> RAID5 data array. I'd like to add a second boot drive to create a RAID1
> mirror, since the current boot drive won't last forever.
> There are plenty of instructions available for installing a fresh Ubuntu
> server install on a RAID1 partition. However, I need to keep & upgrade
> my existing install, since it's heavily customized. I can't find any
> instructions specifically for this scenario. Have any of you ever done
> The idea I've had is to install the new disk and unplug the existing
> boot disk. Install a fresh 18.04 server release using the new disk and
> some spare space from another old disk as the mirrored pair. Once that's
> running, copy the old boot drive's data on top of the new boot drive
> (this is the part I'm not sure will work well). Once the new
> drive/mirror is set up with my old OS, remove the old spare drive from
> the mirror and replace it with the old boot drive. Yes, I have multiple
> Does that sound plausible? Is there a better way?
> I suppose the alternative is to just keep running off a single drive,
> and replace the old one as soon as it throws the first SMART error.
> That makes me nervous, though.
> *Ben "Obi-Wan" Hollingsworth* obiwan at jedi.com <mailto:obiwan at jedi.com>
> www.Jedi.com <http://www.jedi.com>
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