Unfortunately you lose all data on the node as ES will stripe segments across the disks/mount points.
On 15 December 2014 at 11:45, Elvar Böðvarsson <elv...@gmail.com> wrote: > > If you have a node that has 4x disks as JBOD and you configure > Elasticsearch to use all of them, so it will write to as like its Raid0. > > How does Elasticsearch handle a failure of one disk? > Will the whole node go down or will Elasticsearch continue to function > just with lower total available storage? (and then recreate the shards that > went down) > > > > On Saturday, December 13, 2014 3:48:55 PM UTC, Jörg Prante wrote: >> >> The statement is related to performance and I can't agree with it. You >> can easily build a RAID 0 system which has massive I/O throughput >> performance and is superior to JBOD, because RAID striping does not slow >> things down, it is as always as much as fast than a single drive and in >> most RAID levels it is much faster. >> >> In the past, RAID was invented for mirroring cheap and error-prone >> spindle disk arrays, while mirrors increase costs but decrease fault >> probability. >> >> With Elasticsearch, the decision is if you still want to handle disk >> faults by drive redundancy (RAID) and all other hardware faults like power >> outages by server downtime. This is just a matter of organization and of >> cost. I would suggest from my experience: take control over your complete >> hardware setup, equip your systems with expensive SAS2 (or even better) >> controllers with RAID 0 to reduce cost and maximize performance, and handle >> all kind of hardware faults by server downtime, because ES replica level > >> 0 allows that. >> >> There is also a simplification of SAN/NAS in the statement but that is a >> different discussion. Never use SAN/NAS for ES local gateway. >> >> Jörg >> >> On Fri, Dec 12, 2014 at 7:28 PM, Elvar Böðvarsson <elv...@gmail.com> >> wrote: >>> >>> >>> Second, "Prefer JBODs for data disks over RAID, SAN/NAS", would be ok, >>> maybe then to be safe go with 2x replicas, goes well with having 3x nodes >>> >>> -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to elasticsearch+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/elasticsearch/fad86579-2072-438d-94da-80219e200b67%40googlegroups.com > <https://groups.google.com/d/msgid/elasticsearch/fad86579-2072-438d-94da-80219e200b67%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to elasticsearch+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/CAEYi1X_fAiiMnXq5dfGJBuTFxFGt182hVVv_qYKYiqC6%2BQfhUQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
