[mythtv-users] Replace backend 3.5 system disk with 2 2.5 raid1?

[Mike Perkins]

On 26/09/14 14:09, Eric Sharkey wrote:
> On Fri, Sep 26, 2014 at 5:13 AM, Simon Hobson <linux at thehobsons.co.uk> wrote:
>
>> It means that *every* write to the system filesystem has to contend with accesses to all the recording filesystems
>
> The OS drive usage is dominated by reads.
>
Er, no. Every time that a recording is written to one of the storage directories 
a write is also issued to the database to update the seek table for that recording.

That is why it is recommended that the mysql database is not placed on the same 
spindle as any storage directory, because you're automatically doubling the head 
movements - at least.

You're right in that the OS may mostly be reads but there is always the database 
IO to consider. That is usually kept on the same drive as the OS.

-- 

Mike Perkins