[mythtvnz] CompactFlash to SATA adapters for /

[Joel Wiramu Pauling]

Well the problem of performance with the original posters setup will
be because the mpeg2 streams are going to be dumped to the same disk
as the random io for the rest of the OS.

They will get the benefit by moving the myth-data area to
anywhere/anything else - so that the system is not starved of IO.

I bet you anything that the original posters issue is caused by
starved I/O operations waits.

They could

a) Add more disks and make the array raid 0 or 10
b) move the myth stores to a seperate set of disks from the OS.

On 30 November 2010 17:49, Ross Williamson <ross at inertia.net.nz> wrote:
>> that event the fastest CF and SDHC cards are much much slower than
>> platter hard drives.
>
> Depends how you define "slower". Yes, as you mention, the max sustained
> throughput is nowhere near as quick but when is this going to be useful
> on a typical MythTV installation?
>
> There is some truth to the comparison to CD speeds but you have to
> remember that CDs have horrid seek times that are non-existent on CF
> cards, so it is not really a fair comparison.
>
> Generally applications, database accesses etc are going to be loaded
> from effectively random locations on the disk and finished up fairly
> quickly. Having hundreds of MB/s is not going to make much of a
> difference in this case compared to seek time which is zero on any flash
> based device.
>
>> For some perspective: enterprise SATA/SAS drives and Ultrascsi IOp/s
>> are in the 150-300 range which is why your proliant server disk from
>> HP is 2k$ as opposed to 200$ for the equivalent consumer SATA disc.
>
> I don't think anybody is putting enterprise disks in their Myth box.
>
>> Just get a proper SSD.
>
> As mentioned previously, the cost for doing so weighed against the
> benefits is generally such that it is not (IMO) worth the cost. It makes
> far more sense to either go with a cheap flash based solution or stick
> to platter drives.
>
>
> Ross
>
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