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From Dan Kinder <dkin...@turnitin.com>
Subject Re: storing indexes on ssd
Date Tue, 13 Feb 2018 00:30:24 GMT
Created https://issues.apache.org/jira/browse/CASSANDRA-14229

On Mon, Feb 12, 2018 at 12:10 AM, Mateusz Korniak <
mateusz-lists@ant.gliwice.pl> wrote:

> On Saturday 10 of February 2018 23:09:40 Dan Kinder wrote:
> > We're optimizing Cassandra right now for fairly random reads on a large
> > dataset. In this dataset, the values are much larger than the keys. I was
> > wondering, is it possible to have Cassandra write the *index* files
> > (*-Index.db) to one drive (SSD), but write the *data* files (*-Data.db)
> to
> > another (HDD)? This would be an overall win for us since it's
> > cost-prohibitive to store the data itself all on SSD, but we hit the
> limits
> > if we just use HDD; effectively we would need to buy double, since we are
> > doing 2 random reads (index + data).
>
> Considered putting cassandra data on lvmcache?
> We are using this on small (3x2TB compressed data, 128/256MB cache)
> clusters
> since reaching I/O limits of 2xHDD in RAID10.
>
>
> --
> Mateusz Korniak
> "(...) mam brata - poważny, domator, liczykrupa, hipokryta, pobożniś,
>         krótko mówiąc - podpora społeczeństwa."
>                                 Nikos Kazantzakis - "Grek Zorba"
>
>


-- 
Dan Kinder
Principal Software Engineer
Turnitin – www.turnitin.com
dkinder@turnitin.com

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