Re: [MooseFS-Users] changelogs: Writes per day

[Zlatko Č. <zca...@bi...>]

Hello Gandalf,

That is just impossible to answer without knowing your workload + your 
parameters (noatime mounts or not?). You're the only one that can see 
that for yourself and decide appropriately. You can never go wrong with 
 >1 DPWD datacenter grade SSD, becuase you always get what you paid for.

Now, having said that, unless you really want and get sync operations on 
changelog, in my experience any SSD would do. But, if you ever get 
support for sync changelog writing and turn it on, well... then go for 
the most expensive SSD you can buy.

But again, depends... how many metadata operations you expect? Nobody 
can know that except you.

Regards,

On 07.06.2018 17:57, Gandalf Corvotempesta wrote:
> I'm planning which kind of SSD to use for storing /var/lib/mfs
> In that directory, moose is writing all changelog.
>
> On a huge cluster, how many GB/TBs written should I expect, per day?
> Is a write-intensive SSD needed or can I also use a mixed workload SSD
> like the ones with 0.8 DWPD (Intel S4500 480GB)
>
> Any suggestion ?
>
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-- 
Zlatko