Date: Wed, 27 Nov 2013 23:40:01 GMT From: info@ITSMexpert.EU To: freebsd-bugs@FreeBSD.org Subject: Re: kern/184154: [cam] QUIRK: SYNC_CACHE not supported on IBM ServeRAID 8k Message-ID: <201311272340.rARNe1dA004880@freefall.freebsd.org>
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The following reply was made to PR kern/184154; it has been noted by GNATS. From: info@ITSMexpert.EU To: mjacob@freebsd.org, bug-followup@freebsd.org Cc: Subject: Re: kern/184154: [cam] QUIRK: SYNC_CACHE not supported on IBM ServeRAID 8k Date: Thu, 28 Nov 2013 00:29:26 +0100 Just attempt to mount a ZFS pool on six RDM disks caused writing 13 error messages for each disk (78 error messages together, five line in dmesg each). The mount WAS NOT successful. ZFS uses SYNC_CACHE quite often (because of its principle), it can lead into significant performance degradation (if mounted). I can not tolerate such behaviour in production environment handling terabytes of archive data. I need to upgrade to 10.0 as soon as the STABLE version will be released. It seems I will have to patch and recompile kernel first. :-( On 27/11/2013 23:09, Matthew Jacob wrote: > Why do you think this is a serious error? All that the lack of this > command support does is cause the driver to be noisy. The device still > functions correctly, doesn't it? > > 10.X is frozen and won't be changed until after release.
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