[mythtvnz] New list member - Hardware recommendations

[criggie]

On 13/01/12 22:57, Steve Hodge wrote:
> On Fri, Jan 13, 2012 at 19:01, criggie <criggie at criggie.org.nz
> <mailto:criggie at criggie.org.nz>> wrote:
>     My sql database is 335 MB, so it might be feasible to make a raid1 with
>     a partition and a ramdisk.  In theory the writes complete when one disk
>     is written, so that would be the ramdrive.  And the data on the hard
>     drive would provide the permanent storage over a restart.

> With RAID1 a write does not complete until all copies have been written.
> So write performance is approximately equal to the slowest disk in the
> array. The setup you're describing would act more like a cache except
> typically RAID implementations are not designed with radically different
> performance of component drives in mind so you might not get the read
> speeds you're expecting either as at best reads would probably be split
> evenly between the ramdrive and the physical disk.

Again you're right - I must have been remembering something from the 
docs on a hardware raid controller's cache settings that allowed the 
write to "complete" from the OS's point of view.

-- 
Criggie

http://criggie.org.nz/