Problem with disk acess; lost frame and freeze frame

[stf69]

I'm using GBPVR since 2 years. This is a very great PVR software.

Since the begining, I have a dedicated server to GBPVR, with 2 PVR150.
CPU is ilde at 90% of time (even with 2 recording and 2 playback at same time).
All the time, I have 500M on 1024M available.

Playback is done by Media MVP.

I have, at random time, some skip frame on the recording or some freeze during playback.

At recording: some frame are absent of mpg file. Ex: on 33 minutes of recording, 10 to 30 seconds are lost.

At playback: image freeze for 1 to 3 seconds, and continue exactly at the same moment.


I know it is a hard disk throuput problem. I recently buy a Drobo (kind of raid disk enclosure; see Drobo.com). The performance of this usb enclosure is around 22MBytes / second (read and write). Recording and playback of a SDTV show is around 600Kbytes / second.

It is possible to add some buffer in the recording process to be sure every bytes are write to the disk. And same for playback. Or maybe a way to use a hard disk for recording and transfert file to a other disk after. (buffer is probably better.)

I know this is not the first time I report this problem, but I sure little tweaking of in/out of data help in this case.


Thanks


Stf

[sub]

I know it is a hard disk throuput problem

Sorry, but if the problem is your disk performance then you'll need to find a way to improve that performance.

[stf69]

No, I thing performance is more than needed by gbpvr, but at a single time (maybe during a couple of second) disk have to serve multiple request and I have skip frame.

Use of raid 5 array have less performance than raid 0 or single drive, but overall performance is more than 30 times what is necessary to record 2 shows at (600KBytes / second).

I know this is not a frequently report problem, but the 3 systems I use (differant motherboard, cpu, ...) with raid 5 storage have problem.

Thanks again.

[gEd]

My first thought is that this sounds like the infamous pvr 150 timestamp problem .

http://forums.nextpvr.com/showthread.php?t=14006

do you still get the problem if you redirect gbpvr to record to the internal (PATA/SATA) disk? If this is ok, then it's defiantly a problem with the USB disk system.

check you have the latest chipset drivers for your motherboard.