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https://issues.apache.org/jira/browse/IMPALA-8188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16765552#comment-16765552
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Philip Zeyliger commented on IMPALA-8188:
-----------------------------------------
https://unix.stackexchange.com/posts/308724/revisions seems to point to
following {{/sys/class/block/nvme0n1p1}} (or similar) to look at this. It's all
messy.
> Some SSDs are not properly detected as non-rotational
> -----------------------------------------------------
>
> Key: IMPALA-8188
> URL: https://issues.apache.org/jira/browse/IMPALA-8188
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 3.2.0
> Reporter: Joe McDonnell
> Priority: Critical
>
> Here is an example Impala log:
>
> {noformat}
> I0211 10:50:40.650727 18344 init.cc:288] Disk Info:
> Num disks 2:
> nvme0n (rotational=true)
> nvme0n1p (rotational=true){noformat}
> I logged into an equivalent machine, and the OS sees these as not rotational:
>
>
> {noformat}
> # cat /sys/block/nvme0n1/queue/rotational
> 0
> {noformat}
> Device names that end in a number get trimmed (i.e. /dev/sda2 becomes
> /dev/sda). See
> [https://github.com/apache/impala/blob/master/be/src/util/disk-info.cc#L73-L74]
> These devices don't follow that pattern, so we don't find the right files.
> Neither /sys/block/nvme0n nor /sys/block/nvme0n1p exist, so both fall back to
> being rotational.
>
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