SAN Performance

How does SAN get its performance without using write cache? If it does use
write chace, how is it safer than suing a cacheing controller that would som
e
with a RAID subsustem such as a Dell Powervault?The host bus adapters that connect your servers to the SAN will typically
have a hefty cache on them, just like in a DAS environment.
mb
"Jeffrey K. Ericson" wrote:

> How does SAN get its performance without using write cache? If it does us
e
> write chace, how is it safer than suing a cacheing controller that would s
ome
> with a RAID subsustem such as a Dell Powervault?|||Controllers in a SAN do usually implement write-cacheing. Normally a SAN
requires a UPS backup so that writes can be guaranteed in the event of a
power failure.
David Portas
SQL Server MVP
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