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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-6614) IOUtils.spins doesn't work for drives NVMe drives
Date Fri, 26 Jun 2015 13:24:04 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-6614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14602865#comment-14602865
] 

Michael McCandless commented on LUCENE-6614:
--------------------------------------------

To verify there really is a bug here (sorry I should have done this in the OP), I installed
Elasticsearch 2.0 pre-release and started it and I see this in its startup logging output:

{noformat}
[2015-06-26 09:17:54,024][INFO ][env                      ] [Windeagle] using [1] data paths,
mounts [[/ (/dev/disk/by-uuid/d7b5a26e-bf10-4789-8443-9fd98798c554)]], net usable_space [364.3gb],
net total_space [366.6gb], spins? [possibly], types [ext4]
{noformat}

So indeed the bug is really (spins? should say "no", not "possibly"), but the plot thickens
(maybe?) a bit, because of this /dev/disk/by-uuid/... mount point ... or maybe our existing
heuristics deal with this dereference already ...

> IOUtils.spins doesn't work for drives NVMe drives
> -------------------------------------------------
>
>                 Key: LUCENE-6614
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6614
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Uwe Schindler
>            Priority: Minor
>             Fix For: 5.3, Trunk
>
>         Attachments: LUCENE-6614.patch
>
>
> NVMe is the faster (than AHCI) protocol for newer SSDs that plug into the PCIE bus.
> I just built a new beast box with one of these drives, and the partition is named {{/dev/nvme0n1p1}}
while the device is {{/dev/nvme0n1}} by Linux - this also appears in /sys/block with rotational=0.
> I think [~steve_rowe] also has an NVME drive ...
> [~thetaphi] (who got the box working for me: thank you!!!) has ideas on how to fix it!



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