On 2018-09-07 13:52, Janne Johansson wrote:
> Den fre 7 sep. 2018 kl 13:44 skrev Maged Mokhtar <mmokh...@petasan.org>:
>
>> Good day Cephers,
>>
>> I want to get some guidance on erasure coding, the docs do state the
>> different plugins and settings but to really understand them all and their
>> use cases is not easy:
>>
>> -Are the majority of implementations using jerasure and just configuring k
>> and m ?
>
> Probably, yes
>
>> -For jerasure: when/if would i need to change
>> stripe_unit/osd_pool_erasure_code_stripe_unit/packetsize/algorithm ? The
>> main usage is rbd with 4M object size, the workload is virtualization with
>> average block size of 64k.
>>
>> Any help based on people's actual experience will be greatly appreciated..
>
> Running VMs on top of EC pools is possible, but probably not recommended.
> All the random reads and writes they usually cause will make EC less suitable
> than replicated pools, even if it is possible.
> --
> May the most significant bit of your life be positive.
Point well taken...it could be useful for backing up vms, and maybe vms
without too much latency requirements if k and m are not large.
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