Date: Wed, 1 Jun 2016 12:21:14 +0500 From: "Eugene M. Zheganin" <emz@norma.perm.ru> To: stable@freebsd.org Subject: Re: HAST, zfs and local mirroring Message-ID: <574E8CEA.1010908@norma.perm.ru> In-Reply-To: <CAOjFWZ5YOPPF=85NWTj7Uye-zqrCk5EbYjvGqfAoBJdJ37OiXA@mail.gmail.com> References: <bf4a004f-8c7f-1e2e-0c31-3de266975ae4@norma.perm.ru> <CAOjFWZ5YOPPF=85NWTj7Uye-zqrCk5EbYjvGqfAoBJdJ37OiXA@mail.gmail.com>
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Hi. On 01.06.16 02:49, Freddie Cash wrote: > On Tue, May 31, 2016 at 11:18 AM, Eugene M. Zheganin > <emz@norma.perm.ru <mailto:emz@norma.perm.ru>>wrote: > > I wat to start using HAST, I have two nodes and a pair of disk on > each node. So I want to use HASt in an environment where each HAST > resource would be mirrored. What is the preferred approach if I > want to use ZFS on an end-device to avoid exsessive fscking, and, > in the same time, I want to have some redundancy on a block level > ? I see two possibility: HAST on a zvol of a mirrored pool, and a > ZFS on a hast. But recently I heard that nested zfs (like zfs on > zvol) is clamed unsupported. Futhermore, I have zfs on a geli on a > zvol, and this solution proved itself to be very affected to > livelocking - when disk i/o on a such fs is above some treshold, > system is locking, and the only way out is to reset it. Should I > chose geom_mirror to provide a device for HAST and the build ZFS > on it ? > > > The generally recommend way to do this is to create a HAST resource > out of 1 disk from each system, and then build the ZFS pool using the > HAST resources as the "disks". > > That way, your ZFS pool is made up of 2 HAST devices in a mirror vdev. > > And each of the two HAST devices uses one disk from each server (total > of four disks). > > > > But I don't need two HAST devices, I need one, but redundant on each server. Eugene.
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