>> On 07.06.2009 01:58, Marcel Witte wrote: >> So ext4 seems to be perfect for a video-partition, but to make it more >> perfect, it would be nice if VDR could use the fallocate()-systemcall >> as mentioned in the article. This would prevent fragmentation in the file system.
> Udo wrote: >Sounds like a good plan, but unfortunately fallocate requires you to know in >advance how big a file will be. This is not true for VDR recordings. And if >you fallocate with too small or too big sizes, you'll end up with fragmentation >or smaller chunks of unused space again. (All in all, this is probably only >important for concurrent recordings anyway.) Well you can predict file size for certain extent. As VDR has the split recording option built in. That is the maximum filesize. - If you have 1h10min timer. - Allocate 1st file upto split size - Calculate average BW at the same time you are recording - You could even store this - If file is too small, allocate new file for remaining time with average BW + overhead If you have 10min timer (or short timer which will cause filesize under split size) - if you store average BW what channels are having you could allocate directly estimated size Naturally this is not 100% accurate, and would cause some big size fragmentation. For EXT4 it would be nice: - fallocate(4GB) - open file for write - close file after 3GB - automatic fdeallocate(1GB)
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