From owner-freebsd-fs@freebsd.org  Sat Jan 30 08:55:51 2016
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From: "Eugene M. Zheganin" <emz@norma.perm.ru>
Subject: zfs/metaslab debugging mode
To: freebsd-fs@freebsd.org
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Date: Sat, 30 Jan 2016 13:55:43 +0500
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Hi.

Does FreeBSD have a "metaslab debugging mode" for ZFS or something
similar ? In Solaris this is a mode (enabled from mdb) when all the
space maps are kept in memory, thus saving from a situation when the
pool is full/fragmanted (at least partially).

Thanks.
Eugene.