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 some
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 use
> write chace, how is it safer than suing a cacheing controller that would some
> 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