Thank you, Gionatan for your answer.
I finally had time to test the first solution, having the root FS on the
M.2 card and everything else (including /var and /tmp) on the mechanical
drives.
The responsiveness of the machine is awesome and, for now, without any
glitch or problem. So I may retain this solution.
The only remaining question is how to trim the device as it is not
"mounted". Is there a special pvcreate or LVM option to have this device
trimmed when it should be ?
Have a nicce day !
Le 13/05/2017 à 14:16, Gionatan Danti a écrit :
You basically have two possibilities:
1) move the root fs on the M.2 disk, which will give you much higher
system responsiveness compared to the mechanical disks; however, any
data/application installed on the HDD will be slow as always;
2) configure lvmcache [1] for using the M.2 disk as a read-only
(writethrough) caching device for the mechanical disks, which will
give you somewhat lesser system responsiveness but *any*
cache-friendly application will be accelerated from the M.2 disk.
[1] http://man7.org/linux/man-pages/man7/lvmcache.7.html
Regards.
Il 12-05-2017 18:21 Georges Giralt ha scritto:
Hello guys,
I've an Ubuntu machine with two SATA mechanical drives on software
raid 1.
This md is the sole PV of the LVM installation.
As the mainboard has been changed recently, it has an M.2 plug. And
I'm been offered a 128 GB M.2 NGFF card.
So far so good.
Question : Will I gain something adding the M.2 card as a second PV on
my LVM setup and moving the system LV to it ?
What are your experience on the subject ?
Many thanks in advance for your advice !
--
"If a man empties his purse into his head, no man can take it away from him.
An investment in knowledge always pays the best interest"
Benjamin Franklin.
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