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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