Date: Tue, 7 Dec 1999 00:51:41 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Mike Smith <msmith@FreeBSD.ORG> Cc: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/kern kern_shutdown.c Message-ID: <199912070851.AAA75906@apollo.backplane.com> References: <199912070835.AAA01052@mass.cdrom.com>
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:
:> The disk can lie about whether it has written data to the disk without
:> messing softupdates up, but it cannot reorder writes that the system has
:> told it must be ordered. SCSI has a tag to guarentee ordering (or not),
:> but I don't know if IDE has the same sort of feature.
:
:No, it doesn't. I'm not entirely sure that SCSI disks will honour the
:ordered tag all the way down to the media, either. It wouldn't surprise
:me very much to see it honoured only to the cache, with no guarantee that
:a completed ordered tag guarantees on-media state.
I am pretty sure SCSI disks honor the ordered tag, at least the big
brands.
IDE? Who knows.
-Matt
Matthew Dillon
<dillon@backplane.com>
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