[mythtv-users] Hardware Setup Advice
linux at thehobsons.co.uk
Wed May 23 14:25:59 UTC 2012
>Your biggest issue will be disk seek times. Essentially, if you are
>recording 18 streams, then you have 18 threads which are syncing a
>file to disk once a second. This means the disk will be trying to do
>18 seeks & writes/second - and a cursory look at the specs of most
>disks will reveal that this is likely to lead to a bottleneck.
Correction, that should be "at least" 36 seek & writes/second.
Each file write will be accompanied by at least one update to
filesystem metadata, and quite likely more than one.
As a minimum, the file length will need updating. Quite frequently,
some free space will need adding to the file - so the free space
map/tree checking for some space, and updating to mark it as used,
and then the file data updating to add the new bit of space.
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