ZFS cpu requirements, with/out compression and/or dedup

Linda Kateley lkateley at kateley.com
Sun Sep 20 20:03:54 UTC 2015


I usually don't worry about CPU much until i start running alot of IO, 
network or disk.

Dedup takes a ton of memory too.

Any algorithm for TB's of storage and cpu/ram is usually wrong. CPU and 
memory are important by data coming in and out.. not data at rest. What 
kind of data?

On 9/19/15 6:56 AM, Sami Halabi wrote:
> Hi everyone,
> I've been searching the documentation, wiki.. etc. but found no rule of
> thumb to CPU requirements to run ZFS fs. for memory there are few rules
> according to using dedup or not.
>
> rules of thumb I concluded are so far:
> 1. use compression lz4.
> 2. use checksum.
> 3. disable atime.
>
> from what i read the status of dedup is not that clear and seems there are
> bugs and better to avoid it?
>
> so according to 1-3 above what cpu requirements i need? is ATOM cpu like
> supermicro c2750/3/5/8 enough to run system of 20TB /40TB with 1-3 above?
> if dedup IS enabled would it still work fine?
>
> Thanks in advance,
> Sami halabi
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