incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Darren Smythe <darren1...@gmail.com>
Subject Re: 1.2 tuning
Date Sun, 02 Jun 2013 03:58:40 GMT
If the amount of remaining time for compaction keeps going up, does this
point to an overloaded node or an un-tuned node?


On Thu, May 30, 2013 at 3:10 PM, Robert Coli <rcoli@eventbrite.com> wrote:

> On Wed, May 29, 2013 at 2:38 PM, Darren Smythe <darren1482@gmail.com>
> wrote:
> > Were using the latest JNA and separate ephemeral drives for commit log
> and
> > data directories.
>
> (as a note..)
>
> Per nickmbailey, testing shows that there is little/no benefit to
> separating commit log and data dirs on virtualized disk (or SSD),
> because the win from this practice comes when the head doesn't move
> between appends to the commit log. Because   the head must be assumed
> to always be moving on shared disk (and because there is no head to
> move on SSD), you'd be better off with a one-disk-larger ephemeral
> stripe for both data and commit log.
>
> =Rob
>

Mime
View raw message