Date: Sun, 21 Sep 2014 10:52:52 +0200 From: Matthias Andree <matthias.andree@gmx.de> To: freebsd-scsi@freebsd.org Subject: Re: How to disable hard disk write cache? Message-ID: <541E91E4.4030802@gmx.de> In-Reply-To: <541E8F72.4020202@delphij.net> References: <541804B0.7070407@gmail.com> <54184484.1070304@delphij.net> <541E8DAE.8010407@gmx.de> <541E8F72.4020202@delphij.net>
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Am 21.09.2014 um 10:42 schrieb Xin Li: > On 9/21/14 4:34 PM, Matthias Andree wrote: >> Am 16.09.2014 um 16:09 schrieb Xin Li: > >>> Modern SATA/SAS/SCSI devices usually comes with the capability >>> of tagged commands, allowing the OS to know when a write buffer >>> is on stable storage. With this, file systems can easily >>> implement the right semantics and recover from e.g. a power >>> outage, etc. > >> Yes, they *can easily implement* that, but which file systems in >> FreeBSD *actually do* that? > > Both UFS (with Soft Updates, which is what it's all about; I haven't > checked the Journalled Soft Updates case) and ZFS do that for ages. Thank you. Is this in any of the 9.3 manpages so I could look that up rather than ask questions on the lists? :-)
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