<div class="gmail_quote">On Sat, Apr 10, 2010 at 6:04 PM, AlanP <span dir="ltr"><<a href="mailto:alan.p@orcon.net.nz">alan.p@orcon.net.nz</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
What would you all consider good in terms of enough performance for three<br>
channels recording at the same time (off the Freeview DVB-S streams), while<br>
also watching something from the same drive?<br>
<br>
Would a Samsung F2EG 1TB drive be enough? Should I go for a couple in Raid<br>
zero, with another IDE drive I already have as the boot one?<br></blockquote><div><br>Yes, the Samsung will be enough. No, you don't need RAID 0.<br><br>DVB-S SD streams require about 2-2.5GB per hour: i.e. about 0.7MB per second. A modern drive is capable of easily 35MB per second write speed (for example). With only 4 transfers going at once you'd probably be fine even with HD streams.<br>
</div><div><br>I don't regularly record three things at once but I have had two things recording, one undergoing commercial detection and one being watched and have never had any problems, even with the db and all recordings being on the same three year old drive. This happened a lot during the olympics.<br>
<br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I currently have a 160G IDE, and 2 320G SATA drives all lumped together in<br>
Linux'es native what-ever-it-is setup, and at times in the evenings it gets<br>
mildly laggy.<br></blockquote><div><br>I doubt drive bandwidth is the problem. It could be that you don't have enough ram so are swapping. It could be database performance - having the database on a different drive to the recordings is a good idea. The sort of random access to files that databases do can significantly impact the sequential read/write performance that video files typically enjoy.<br>
<br>Now that Myth has storage groups you'd be far better of not having those drives combined with LVM or whatever. Just assign them to separate storage groups and let Myth handle the load balancing. Keep one drive free for the system and the database and everything will be great.<br>
<br>Cheers,<br>Steve<br></div></div>