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From Shawn Heisey <apa...@elyograg.org>
Subject Re: SolrCloud and LVM
Date Fri, 06 Jan 2017 00:54:51 GMT
On 1/5/2017 3:12 PM, Chris Ulicny wrote:
> Is there any known significant performance impact of running solrcloud with
> lvm on linux?
>
> While migrating to solrcloud we don't have the storage capacity for our
> expected final size, so we are planning on setting up the solrcloud
> instances on a logical volume that we can grow when hardware becomes
> available.

Nothing specific.  Whatever the general performance impacts for LVM are
is what Solr would encounter when it reads and writes data to/from the disk.

If your system has enough memory for good performance, then disk reads
will be rare, so the performance of the storage volume wouldn't matter
much.  If you don't have enough memory, then the disk performance would
matter ...although Solr's performance at that point would probably be
bad enough that you'd be looking for ways to improve it.

Here's some information:

https://wiki.apache.org/solr/SolrPerformanceProblems

Exactly how much memory is enough depends on enough factors that there's
no good general advice.  The only thing we can say in general is to
recommend the ideal setup -- where you have enough spare memory that
your OS can cache the ENTIRE index.  The ideal setup is usually not
required for good performance.

Thanks,
Shawn


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