SATA Raid

Lennart Sorensen lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys at public.gmane.org
Mon Jun 19 16:05:09 UTC 2006


On Mon, Jun 19, 2006 at 03:27:52PM +0000, Christopher Browne wrote:
> The on-card BBU does not need to depend on the entire chain:
>  UPS -->
>      Power Cable -->
>         PSU -->
>            Motherboard -->
>               CPU, RAM, ...
> 
> It shortens the chain to:
>  Battery --> RAID Cache
> 
> The failure of *any* of the components in the first chain will corrupt
> the filesystem.
> 
> In the case of the RAID card with BBU, *none* of those are forcible
> dependancies.

Certainly running write caching is not a good idea without a battery
backed cache.  And write caching on the disk itself should never be
enabled.  I don't trust UPSs that much.  To easy to overload and get a
fun surprise when a power glitch does happen. :)

Len Sorensen
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