LARGE single-system Cyrus installs?

[Pascal Gienger]

Michael Bacon <baconm at email.unc.edu> wrote:

> I have heard tell of funny behavior that ZFS does if you've got
> battery-backed write caches on your arrays.


/etc/system:

set zfs:zfs_nocacheflush=1


is your friend. Without that, ZFS' performance on hardware arrays with 
large RAM caches is abysmal.

Some arrays do have the possibility to ignore these flush requests 
although, but still following them when internal battery storage is faulted 
or in phase of regeneration (alltogether with setting write-through-mode 
on).

Pascal