[linux-lvm] Question on mixing technologies

Gionatan Danti g.danti at assyoma.it
Sat May 13 12:16:18 UTC 2017

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


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 !

Danti Gionatan
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