Multiple datadir vs RAID0

Elastic Stack Elasticsearch
1

Hi all,

I'm planning on deploying an ES cluster soon; machines will be equipped
with 4 x 240GB SSD drives, and I wonder what's the pros and cons of having
multiple data dirs vs having a setup with the 4 drives in RAID0 ?

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2

Multiple data dirs seems pointless, what were you hoping to achieve with
that?

I'd go RAID0, let ES handle the redundancy at a higher level (with
replicas).

Regards,
Mark Walkom

Infrastructure Engineer
Campaign Monitor
email: markw@campaignmonitor.com
web: www.campaignmonitor.com

On 21 December 2013 20:20, briche arnaud briche.arnaud@gmail.com wrote:

Hi all,

I'm planning on deploying an ES cluster soon; machines will be equipped
with 4 x 240GB SSD drives, and I wonder what's the pros and cons of having
multiple data dirs vs having a setup with the 4 drives in RAID0 ?

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3

RAID0: hardware, with sliced drives (all drives are the same) give optimal
speed

multiple data dirs: software, can not be reverted, config overhead if disk
sizes and speeds are unbalanced

Many controllers support JBOD (concatenating different sized drives into
one drive). I'd even prefere JBOD over multiple data dirs.

Jörg

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