Date: Sat, 8 Jun 2013 21:59:43 -0500 From: Adam Vande More <amvandemore@gmail.com> To: Jeremy Chadwick <jdc@koitsu.org> Cc: Steven Hartland <smh@freebsd.org>, fs@freebsd.org Subject: Re: Changing the default for ZFS atime to off? Message-ID: <CA%2BtpaK0QH51tpaOvK9H6-O86-CiuhCUrsiyXeA7OrGW3rwAfTw@mail.gmail.com> In-Reply-To: <20130608213331.GB18201@icarus.home.lan> References: <16FEF774EE8E4100AD2CAEC65276A49D@multiplay.co.uk> <20130608213331.GB18201@icarus.home.lan>
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On Sat, Jun 8, 2013 at 4:33 PM, Jeremy Chadwick <jdc@koitsu.org> wrote: > I **strongly** oppose this change, for one key reason: the classic > Berkeley UNIX mail spool format (known as "mbox"), which is still > predominantly used on most UNIX systems today. > > Mail clients which read mbox files require a combination of atime and > mtime to determine if new mail has arrived within the mailbox. If > mtime > atime, then there's new mail. Not all mail clients support > alternate methods of detection (for example mutt has check_mbox_size, > which has had bugs/problems in the past (Google check_mbox_size), > and is fallible in other ways). > > Further points: > > - FreeBSD comes with sendmail (MTA/MDA), which supports only mbox > natively > - FreeBSD comes with mail/Mail/mailx (client), which only supports > only mbox natively > - FreeBSD comes with biff/comsat, as well as from(1), which supports > only mbox natively > Most modern linuce use relatime eg the benefits of noatime and preserving functionality for mail stuff. https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Power_Management_Guide/Relatime.html -- Adam Vande More
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