[ceph-users] Disabling write cache on SATA HDDs reduces write latency 7 times

Kevin Olbrich ko at sv01.de
Tue Nov 13 00:47:38 PST 2018


I read the whole thread and it looks like the write cache should always be
disabled as in the worst case, the performance is the same(?).
This is based on this discussion.

I will test some WD4002FYYZ which don't mention "media cache".

Kevin

Am Di., 13. Nov. 2018 um 09:27 Uhr schrieb Виталий Филиппов <
vitalif at yourcmc.ru>:

> This may be the explanation:
>
>
> https://serverfault.com/questions/857271/better-performance-when-hdd-write-cache-is-disabled-hgst-ultrastar-7k6000-and
>
> Other manufacturers may have started to do the same, I suppose.
> --
> With best regards,
> Vitaliy Filippov_______________________________________________
> ceph-users mailing list
> ceph-users at lists.ceph.com
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>
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