|Matt Mossholder on 28 Sep 2013 15:23:27 -0700|
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|Re: [PLUG] Spanning volumes with LVM (Ubuntu)|
On Sat, Sep 28, 2013 at 5:32 PM, Matt Mossholder <email@example.com> wrote:Honestly, unless you have 10 tuners all running in HD I think this is overkill.
> I would recommend you used the 1TB drive for the OS and DB, and use the
> other two drives for storing recordings. If you want to put other static
> content (pictures, music, etc.) on the recordings drives, that is probably
> OK, as long as you aren't hammering the disks while you are recording.
I was running a raid5 across 5 drives containing LVM volumes for OS
and mythtv and was able to sustain recording 4 HD streams at once (on
FIOS, which has fairly high bitrates), along with playback and even
transcoding. ÂGranted, if I did all that and did something
disk-intensive on the side things would bog down. ÂNow, this system
had 8GB of RAM, and I had the write cache set to the max 30s, so I'm
sure that helped a bit.
Since then I have moved my OS to a separate drive, but only so that it
can be on an SSD (with hourly rsyncs to an array). ÂHaving the OS on
an SSD certainly confers benefits.
Note that I am talking about multiple drives on a RAID5, which
obviously has benefits when it comes to large sequential read/writes.
LVM across multiple drives really doesn't buy you much except space
unless you're micro-managing your layouts to try to even out accesses.
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