[jira] [Commented] (SOLR-12098) Document the Lucene spins auto-detection and its effect on CMS dynamic defaults

["Dawid Weiss (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-12098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16400366#comment-16400366 ] 

Dawid Weiss commented on SOLR-12098:
------------------------------------

I also wonder whether it's not the time to make SSDs the default... I recently spoke with a (large) company that deploys Solr on machines attached to (pricey!) disk arrays. The kernel doesn't set those "spins" flags there and this resulted in abysmal performance until somebody noticed this (manual) switch.

> Document the Lucene spins auto-detection and its effect on CMS dynamic defaults
> -------------------------------------------------------------------------------
>
>                 Key: SOLR-12098
>                 URL: https://issues.apache.org/jira/browse/SOLR-12098
>             Project: Solr
>          Issue Type: Task
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: documentation
>            Reporter: Shalin Shekhar Mangar
>            Priority: Major
>             Fix For: 7.3, master (8.0)
>
>
> Lucene auto-detects whether the underlying directory is on a rotational or SSD type disk and based on that it sets defaults for ConcurrentMergeScheduler. We should document this and the system property based workaround in the Taking Solr to Production page (and perhaps also in solrconfig.xml sections)



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