My gut says you won't see much of a performance boost. Especially if you're on SSD as the journal isn't going to be hindered by random write speed.
Also, I *believe* you will lose filesystem metadata too… which Cassandra doesn't protect you from. On Tue, May 20, 2014 at 9:30 AM, Paulo Ricardo Motta Gomes < paulo.mo...@chaordicsystems.com> wrote: > > On Tue, May 20, 2014 at 1:24 PM, Terje Marthinussen < > tmarthinus...@gmail.com> wrote: > >> Journal enabled is faster on almost all operations. >> >> > Good to know, thanks! > > > >> Recovery here is more about saving you from waiting 1/2 hour from a >> traditional full file system check. >> >> > On an EC2 environment you normally lose the machine anyway on failures, so > that's not of much use in that case. > > >> Feel free to wait if you want though! :) >> >> Regards, >> Terje >> >> On 21 May 2014, at 01:11, Paulo Ricardo Motta Gomes < >> paulo.mo...@chaordicsystems.com> wrote: >> >> Thanks for the links! >> >> Forgot to mention, using XFS here, as suggested by the Cassandra wiki. >> But just double checked and it's apparently not possible to disable >> journaling on XFS. >> >> One of ours sysadmin just suggested disabling journaling, since it's >> mostly for recovery purposes, and Cassandra already does that pretty well >> with commitlog, replication and anti-entropy. It would anyway be nice to >> know if there could be any performance benefits from it. But I personally >> don't think it would help much, due to the append-only nature of cassandra >> writes. >> >> >> On Tue, May 20, 2014 at 12:43 PM, Michael Shuler >> <mich...@pbandjelly.org>wrote: >> >>> On 05/20/2014 09:54 AM, Samir Faci wrote: >>> >>>> I'm not sure you'd be gaining much by doing this. This is probably >>>> dependent on the file system you're referring to when you say >>>> journaling. There's a few of them around, >>>> >>>> You could opt to use ext2 instead of ext3/4 in the unix world. A quick >>>> google search linked me to this: >>>> >>> >>> ext2/3 is not a good choice for file size limitation and performance >>> reasons. >>> >>> I started to search for a couple links, and a quick check of the links I >>> posted a couple years ago seem to still be interesting ;) >>> >>> http://mail-archives.apache.org/mod_mbox/cassandra-user/ >>> 201204.mbox/%3c4f7c5c16.1020...@pbandjelly.org%3E >>> >>> (repost from above) >>> >>> Hopefully this is some good reading on the topic: >>> >>> https://www.google.com/search?q=xfs+site%3Ahttp%3A%2F% >>> 2Fmail-archives.apache.org%2Fmod_mbox%2Fcassandra-user >>> >>> one of the more interesting considerations: >>> http://mail-archives.apache.org/mod_mbox/cassandra-user/201004.mbox/% >>> 3ch2y96b607d1004131614k5382b3a5ie899989d62921...@mail.gmail.com%3E >>> >>> http://wiki.apache.org/cassandra/CassandraHardware >>> >>> http://wiki.apache.org/cassandra/LargeDataSetConsiderations >>> >>> http://www.datastax.com/dev/blog/questions-from-the-tokyo- >>> cassandra-conference >>> >>> -- >>> Kind regards, >>> Michael >>> >> >> >> >> -- >> *Paulo Motta* >> >> Chaordic | *Platform* >> *www.chaordic.com.br <http://www.chaordic.com.br/>* >> +55 48 3232.3200 >> >> > > > -- > *Paulo Motta* > > Chaordic | *Platform* > *www.chaordic.com.br <http://www.chaordic.com.br/>* > +55 48 3232.3200 > -- Founder/CEO Spinn3r.com Location: *San Francisco, CA* Skype: *burtonator* blog: http://burtonator.wordpress.com … or check out my Google+ profile<https://plus.google.com/102718274791889610666/posts> <http://spinn3r.com> War is peace. Freedom is slavery. Ignorance is strength. Corporations are people.
