Date: Wed, 28 Jun 2017 19:01:26 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-doc@FreeBSD.org Subject: [Bug 220343] The manual page for mpt should inform about disk size limitations of most/all supported controllers Message-ID: <bug-220343-9@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D220343 Bug ID: 220343 Summary: The manual page for mpt should inform about disk size limitations of most/all supported controllers Product: Documentation Version: Latest Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: Documentation Assignee: freebsd-doc@FreeBSD.org Reporter: sebastian@rostwald.de Most (if not all?) controllers supported by the mpt driver have firmware- and/or hardware-induced limitations on their supported disk/array/LUN size = -=20 mostly <2TB. As these limitations are well below typical sizes of modern ha= rd drives, it would be sensible to inform the user about these limitations in = the manual page. While most controllers truncate the usable/reported size to the supported s= ize, some might wrap around and cause serious data corruption. See for example t= he 3ware 7000/8000 series in this archived KB article: http://web.archive.org/web/20120326110817/http://kb.lsi.com:80/Knowledgebas= eArticle16481.aspx >From my own experiences, behaviour of many controllers with such limitations upon attaching bigger disks is best described as "undefined" - I've seen anything from not recognizing/reporting the disks, locking up at boot to se= vere data loss when reaching the supported size limit. Due to the possibility of data loss on controllers that wrap around address space, I suggest adding the information about these limitations and possible data loss within a WARNING section of the manual page. Draft/suggestion: ---- WARNING Most controllers supported by the mpt driver suffer from limitations on supported disk size (mostly <2TB). While *most* controllers will only trunc= ate usable disk size, others might behave unexpectedly and cause severe data lo= ss. Refer to the specifications of your chipset and firmware version for information about supported disk size. ---- --=20 Regards, Sebastian --=20 You are receiving this mail because: You are the assignee for the bug.=
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