Re: modify crappy partitionning

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On Fri, Mar 25, 2016 at 11:06 AM, thibaut noah <thibaut.noah@xxxxxxxxx> wrote:
> Hello, i currently have a performance issue (slow vm and system) due to a
> crappy partitionning i did on my fedora install, wish i knew better at the
> time.
> So basically i have two disks, one ssd and one hard drive.
> My ssd partitions :
> /dev/sdc1 ext4 /boot
> /dev/sdc2 lvm2 pv root
> /dev/sdc3 ext4 /home    (this is not currently mounted)
>
> my hard drive partitios :
> /dev/sdb1 lvm2 pv Home (it includes apparently the swap too)
>
> here is my fstab
> http://ur1.ca/oohd9
>
> Following the thread here :
> https://ask.fedoraproject.org/en/question/50007/how-to-change-home-directory-location-to-be-on-hdd-drive-when-system-is-installed-on-ssd/
>
> I created a new partition (sdc3) where i rsynced my /home and i tried to
> mount things.
> It does indeed mount without error it seems but i cannot boot on it.
> I assume the problem is coming from lvm and the swap partition but i have no
> clue how to solve this, could someone give me a hint please? (if it is
> fixable of course).


pvmove

I forget off hand if you need to do a vgreduce first or anything else,
but basically what you want to do is move physical extents from the
SSD to the HDD, and then remove the SSD from the VG. So that's some
combination of vgreduce, pvmove, and pvremove, possibly in that order.

What you might want to do after that's successful is look at lvmcache
or bcache. As usual with more layers, especially new ones like
lvmcache and bcache, be more judicious with backups unless the data is
useless.

-- 
Chris Murphy
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