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From Dan Simpson <>
Subject Re: Commit log on USB flash disk?
Date Sat, 16 Nov 2013 16:30:33 GMT
It doesn't seem like a great idea.  The USB drives typically use dynamic
wear leveling.  See this analysis on wear:,d.aWc&cad=rjt

If you you do end up using it, make sure to monitor write latency so you
don't get hit by the bus.

On Sat, Nov 16, 2013 at 6:12 AM, David Tinker <>wrote:

> 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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