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On 2018-09-07 13:52, Janne Johansson wrote:
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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