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From David Tinker <>
Subject Re: Commit log on USB flash disk?
Date Sun, 17 Nov 2013 08:03:14 GMT
Not using a commit log at all isn't something I had considered. We may
very well be able to do that for our application. Thanks.

On Sat, Nov 16, 2013 at 6:17 PM, Tupshin Harper <> wrote:
> It's conceivable that one of the faster USB 3.0 sticks would be sufficient
> for this. I wouldn't exactly call it an "enterprise" configuration, but it's
> worth considering. Keep in mind that if you are comfortable using your RF
> for durability, you can turn off durable_writes on your keyspace and not
> write to the commitlog at all.
> On Sat, Nov 16, 2013 at 11:05 AM, Philippe <> wrote:
>> Hi david, we tried it two years ago and the performance of the USB stick
>> was so dismal we stopped.
>> Cheers
>> Le 16 nov. 2013 15:13, "David Tinker" <> a écrit :
>>> Our hosting provider has a cost effective server with 2 x 4TB disks
>>> with a 16G (or 64G) USB thumb drive option. Would it make sense to put
>>> the Cassandra commit log on the USB thumb disk and use RAID0 to use
>>> both 4TB disks for data (and Ubuntu 12.04)?
>>> Anyone know how long USB flash disks last when use for a write heavy
>>> workload like this?
>>> Please tell me if this is a really bad idea.
>>> Our alternative is to use one 4TB disk for commit log and one for
>>> data. Of course this will give us only half the space.
>>> Thanks
>>> David

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