Date: Fri, 23 Dec 2011 20:17:10 GMT From: Garrett Cooper <yanegomi@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: docs/163576: zfs(8) sync property not noted in the manpage Message-ID: <201112232017.pBNKHAgS058041@red.freebsd.org> Resent-Message-ID: <201112232020.pBNKKIug035149@freefall.freebsd.org>
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>Number: 163576 >Category: docs >Synopsis: zfs(8) sync property not noted in the manpage >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-doc >State: open >Quarter: >Keywords: >Date-Required: >Class: doc-bug >Submitter-Id: current-users >Arrival-Date: Fri Dec 23 20:20:17 UTC 2011 >Closed-Date: >Last-Modified: >Originator: Garrett Cooper >Release: 10-CURRENT >Organization: n/a >Environment: FreeBSD streetfighter.ixsystems.com 10.0-CURRENT FreeBSD 10.0-CURRENT #0 r227801: Mon Nov 21 14:04:39 PST 2011 root@streetfighter.ixsystems.com:/usr/obj/usr/src/sys/STREETFIGHTER amd64 >Description: The sync property isn't discussed in the zfs(8) manpage. The sync property allows administrators to turn off write synchronization at the "filesystem" level (in reality the ZIL level according to /sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_objset.c), which might improve performance in some scenarios. Just like setting checksum=off though, it should be highly discouraged option to tweak because with standard setups and with some disk technologies (*ATA and some big HDD vendors, I'm looking at you ;)..), this could result in catastrophic data loss in the event where enough drives become unavailable, there's a system (software/hardware) failure, or power outage. >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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