I'm running small CEPH cluster of 9 OSD nodes, with systems hosted on USB sticks exactly for the same reason - not enough disk slots. Works fine for almost 2 years now.
2018-08-15 1:13 GMT+03:00 Paul Emmerich <paul.emmerich@xxxxxxxx>:
I've seen the OS running on SATA DOMs and cheap USB sticks.
It works well for some time, and then it just falls apart.
Paul
2018-08-14 9:12 GMT+02:00 Burkhard Linke
<Burkhard.Linke@computational.bio.uni-giessen.de >:
--> Hi,
>
>
> AFAIk SD cards (and SATA DOMs) do not have any kind of wear-leveling
> support. Even if the crappy write endurance of these storage systems would
> be enough to operate a server for several years on average, you will always
> have some hot spots with higher than usual write activity. This is the case
> for filesystem journals (xfs, ext4, almost all modern filesystems). Been
> there, done that, had two storage systems failing due to SD wear....
>
>
> The only sane setup for SD cards amd DOMs are flash aware filesystems like
> f2fs. Unfortunately most linux distributions do not support these in their
> standard installers.
>
>
> Short answer: no, do not use SD cards.
>
>
> Regards,
>
> Burkhard
>
>
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Paul Emmerich
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