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From: Pan Tsu <inyaoo@gmail.com>
To: freebsd-fs@freebsd.org
Date: Mon, 27 Jun 2011 14:50:08 +0400
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Subject: vfs.zfs.write_limit_override is read-only on v28?
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After v28 import the sysctl changed from RW to RDTUN while
dsl_pool_tempreserve_space() haven't changed since v13 import.

Why?