On 08/14/2018 09:12 AM, Burkhard Linke wrote:
> 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....
>
I've been running OS on the SuperMicro 64 and 128GB SATA-DOMs for a
while now and work fine.
I disable Ceph's OSD logging though for performance reasons, but it also
saves writes.
They work just fine.
Wido
>
> 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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