Re: [gentoo-user] ZFS

[Volker Armin Hemmann]

Am 19.09.2013 06:47, schrieb Grant:
>>>> turn off readahead. ZFS' own readahead and the kernel's clash - badly.
>>>> Turn off kernel's readahead for a visible performance boon.
>>> You are probably not talking about ZFS readahead but about the ARC.
>> which does prefetching. So yes.
> I'm taking notes on this so I want to clarify, when using ZFS,
> readahead in the kernel should be disabled by using blockdev to set it
> to 8?
>
> - Grant
>
> .
>
you can't turn it off (afaik) but 8 is a good value - because it is just
a 4k block.