Freebsd8.1 ZFS with mfi driver performance

[Thomas Steen Rasmussen]

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On 20-01-2011 14:57, jackie wang wrote:
> hello ,I have a question.Sorry I have google a lot and have no answer.
> I run freebsd 8.1 with zfs file system and mfi driver .
> And my problem is when the system started , the speed is fast ,but
> after one or two days the system began to slow .
> My server main used as a web server ,the ram is 8G.
Hello,

Try checking if your problems fall inbetween "patrol read enabled" and
"patrol read disabled" (should be logged in messages). I've recently
disabled "patrol reads" (mfiutil patrol disable) on an MFI controller,
as it was causing instability on a VirtualBox host, when the patrol read
happened at the same time as heavy IO.

Good luck with it!

Best regards,

Thomas Steen Rasmussen
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