[mythtv-users] hdparm was: MythShyte

Gavin Haslett gavin at nodecaf.net
Wed Jul 20 11:18:13 EDT 2005

hdparm -c1 -d1 -u1 /dev/hdb
This was what I found worked best for me. I set this on all three of my drives during boot in a startup script called "mythhw". 
What I looked for was maximum throughput and lowest latency. Basically, I went through the MAN pages for hdparm and tried each setting in turn on a drive other than my OS drive (one of the two mirror set that have my video, recording and SQL databases). Once I did that I ran 
hdparm -t /dev/hdb
hdparm -T /dev/hdb
I re-ran these two commands and kept comparing results until I either got no more improvement or started ot make it worse. Then I just rolled back settings until I identified the minimum parameters I needed to get optimum performance.
Sure, I locked my machine hard a couple of times... but it was worth it to get the max performance out of my drives.
Once I had this done, I mirrored the two drives and ran the same tests on /dev/md0 and /dev/md1.
I then tried the same settings with the OS drive to find out if it made a difference... it did... and added that to the mythhw script.
Hope this helps!

	-----Original Message----- 
	From: mythtv-users-bounces at mythtv.org on behalf of Marius Schrecker 
	Sent: Wed 7/20/2005 2:41 AM 
	To: Discussion about mythtv 
	Subject: [mythtv-users] hdparm was: MythShyte

	Gavin Haslet wrote:
	>I had problems with stutt
	>ring occasionally until I got
	down-and-dirty with hdparm to fix some of the HD problems. Now I have a
	bootup script that runs the hdparm parameters that I found worked best
	with video....
	Just wondering which paramaters worked for you and what to look for when
	optimizing for video.
	Registered Linux user

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