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From "Dawid Weiss (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-6614) IOUtils.spins doesn't work for drives NVMe drives
Date Fri, 26 Jun 2015 12:37:04 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-6614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14602816#comment-14602816
] 

Dawid Weiss commented on LUCENE-6614:
-------------------------------------

> tmpfs is not a spinning disk.

So? Does it have large seek latency? I think the criterion should be: could it run multiple
disk operations (like merges) at the same time without additional performance penalty. If
it passes then it's just as good as an SSD, regardless of what's behind it.

> 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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