Great ! On Wed, Aug 8, 2012 at 11:41 AM, Amit Kumar <kumaramit.ex...@gmail.com>wrote:
> > There is a really good presentation about SSD and Cassandra on youtube by > Rick Branson. I highly recommend watching it. > > http://www.youtube.com/watch?v=zQdDi9pdf3I > > > Amit > On Aug 8, 2012, at 6:23 AM, Hiller, Dean wrote: > > > A 7.5 is probably fine and can still beat it as it is going to be the > speed of writing not seeking(and I am not sure if they spec hard drives > with a write time when not seeking….not sure). Remember that drives are > rated on how fast they spin…this disk should not be spinning a lot(in > theory)…it is always writing. > > > > Even on a read, it would do one seek and then do a very long sequential > read(and I think that only happens on startup anyways). > > > > Later, > > Dean > > > > From: Darvin Denmian <darvin.denm...@gmail.com<mailto: > darvin.denm...@gmail.com>> > > Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" > <user@cassandra.apache.org<mailto:user@cassandra.apache.org>> > > Date: Wednesday, August 8, 2012 7:16 AM > > To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" < > user@cassandra.apache.org<mailto:user@cassandra.apache.org>> > > Subject: Re: Use of SSD for commitlog > > > > Thanks for your reply Dean, > > > > considering your reply.... maybe I use a 15k RPM SCSI Disk, I think > it'll perform better than a SSD disk. > > > > On Wed, Aug 8, 2012 at 10:01 AM, Hiller, Dean <dean.hil...@nrel.gov > <mailto:dean.hil...@nrel.gov>> wrote: > > Probably not since it is sequential writes….(ie. Seek performance is the > big hit and if it is sequential it should not be seeking and is about just > as fast as an SSD in theory). In practice, I have not measure the > performance of one vs. the other though…that I always the best way to > go.(you could write a micro benchmark test with warmup writes and then > stream writes to and see how it does without cassandra). > > > > Dean > > > > From: Darvin Denmian <darvin.denm...@gmail.com<mailto: > darvin.denm...@gmail.com><mailto:darvin.denm...@gmail.com<mailto: > darvin.denm...@gmail.com>>> > > Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org > ><mailto:user@cassandra.apache.org<mailto:user@cassandra.apache.org>>" < > user@cassandra.apache.org<mailto:user@cassandra.apache.org><mailto: > user@cassandra.apache.org<mailto:user@cassandra.apache.org>>> > > Date: Tuesday, August 7, 2012 8:34 PM > > To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org><mailto: > user@cassandra.apache.org<mailto:user@cassandra.apache.org>>" < > user@cassandra.apache.org<mailto:user@cassandra.apache.org><mailto: > user@cassandra.apache.org<mailto:user@cassandra.apache.org>>> > > Subject: Use of SSD for commitlog > > > > Hi, > > > > Can somebody tell me if is there some benefit in use SSD Disks > > for commitlog? > > > > THanks! > > > >
