21 Feb
2023
21 Feb
'23
1:46 p.m.
Michael Wodniok (wodniok) writes:
Hi all,
digging around debugging, why our (small: 10 Hosts/~60 OSDs) cluster is so slow even
while recovering I found out one of our key issues are some SSDs with SLC cache (in our
case Samsung SSD 870 EVO) - which we just recycled from other use cases in the hope to
speed up our mainly hdd based cluster. We know it's a little bit random which objects
get accelerated when not used as cache.
Somewhat off-topic, but... may I recommend *not* using the 870s ?
There is an issue with 870s failing around 14-17 TB written if they're
not running the latest firmware... I recently pulled 25 of them out of
our storage because of this.
https://twitter.com/regnauld/status/1502185863052152833
Cheers,
Phil