Date: Wed, 1 Jun 2016 16:23:00 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: "Eugene M. Zheganin" <emz@norma.perm.ru> Cc: stable@freebsd.org Subject: Re: HAST, zfs and local mirroring Message-ID: <20160601132300.GA75625@zxy.spb.ru> In-Reply-To: <bf4a004f-8c7f-1e2e-0c31-3de266975ae4@norma.perm.ru> References: <bf4a004f-8c7f-1e2e-0c31-3de266975ae4@norma.perm.ru>
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On Tue, May 31, 2016 at 11:18:32PM +0500, Eugene M. Zheganin wrote: > Hi. > > 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 ? Only FS support changed data bypass FS layer is Files-11 ODS-2 level, may be hardware support required. Can you use ZFS mirror with one vdev local and other vdev by iSCSI? Every node using separate ZFS pool in this case.
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