Date: Wed, 19 Nov 2014 19:08:05 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 195174] New: bsdinstall(8) does not align partitions at 4k (or more) Message-ID: <bug-195174-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195174 Bug ID: 195174 Summary: bsdinstall(8) does not align partitions at 4k (or more) Product: Base System Version: 10.1-RELEASE Hardware: Any OS: Any Status: Needs Triage Severity: Affects Some People Priority: --- Component: bin Assignee: freebsd-bugs@FreeBSD.org Reporter: Mark.Martinec@ijs.si Mark Martinec wrote (2014-10-10): https://lists.freebsd.org/pipermail/freebsd-stable/2014-October/080509.html An install of a 10.1 from an installation ISO DVD. Apart from choosing a ZFS filesystem, other options were left to their default. In particular, the align-to-4k ZFS options was left enabled. The ZFS really ended up with ashift 12, but neither the swap nor the zfs partition is 4k aligned: # gpart show /dev/ada0 => 34 625142381 ada0 GPT (298G) 34 1024 1 freebsd-boot (512K) 1058 8388608 2 freebsd-swap (4.0G) 8389666 616752749 3 freebsd-zfs (294G) I find this unacceptable and surprising, regardless of what the underlying media is. Patrick M. Hausen wrote (2014-11-19): https://lists.freebsd.org/pipermail/freebsd-stable/2014-November/081080.html I just installed a new machine with 10.1-RELEASE using the memstick installer and chosing ZFS mirror root as the disk layout. I did check the "4k" option, watched the installer do the necessary gnop dance and the pool seems to be OK: [...] But this puzzles me a bit: None of the start sector numbers is a multiple of 8, neither are the end sectors a multiple of 8 minus 1. So the pool uses a 4k block size but it starts on an odd multiple of 2k on the platter - do I see this correctly? [...] In summary: - the bsdinstall should align GPT partition as a bare minimum at a 4k boundaries regardless of the underlying media; - in my opinion the first (freebsd-boot) partition should be aligned at 512kB with a size of 512kB, and all following GPS partitions should be aligned at 1 MB by default. -- You are receiving this mail because: You are the assignee for the bug.
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