Date: Thu, 21 Jul 2011 07:51:06 -0700 From: Kevin Oberman <kob6558@gmail.com> To: Alexander Leidinger <Alexander@leidinger.net> Cc: "freebsd-stable@freebsd.org Stable" <freebsd-stable@freebsd.org>, Jeremy Chadwick <freebsd@jdc.parodius.com> Subject: Re: Status of support for 4KB disk sectors Message-ID: <CAN6yY1tpa%2BO7kgz2MLqu1aBVSHzWE-fdE4N-0zyiCiqe2yqt-A@mail.gmail.com> In-Reply-To: <20110721150233.765349kg5ed4p9bd@webmail.leidinger.net> References: <CAN6yY1uaUqk2ifiNViJyMFJWf60a4DmCiVs3Z=--_TjtzseABQ@mail.gmail.com> <20110718234124.GA5626@icarus.home.lan> <20110719224126.00000a25@unknown> <CAN6yY1ud9hJvufhabuNP9mK1qkS5sPLkzPvfEfOm5BQP_hQ1sw@mail.gmail.com> <20110721150233.765349kg5ed4p9bd@webmail.leidinger.net>
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On Thu, Jul 21, 2011 at 6:02 AM, Alexander Leidinger <Alexander@leidinger.net> wrote: > Quoting Kevin Oberman <kob6558@gmail.com> (from Tue, 19 Jul 2011 14:33:27 > -0700): > >> On Tue, Jul 19, 2011 at 1:41 PM, Alexander Leidinger >> <Alexander@leidinger.net> wrote: >>> >>> On Mon, 18 Jul 2011 16:41:24 -0700 Jeremy Chadwick >>> <freebsd@jdc.parodius.com> wrote: >>> >>>> But the currently "known method" is to use gnop(8). =A0Here's an >>>> example: >>>> >>>> >>>> http://www.leidinger.net/blog/2011/05/03/another-root-on-zfs-howto-opt= imized-for-4k-sector-drives/ >>>> >>>> Now, that's for ZFS, but I'm under the impression the exact same is >>>> needed for FFS/UFS. >>> >>> Info: gnop will not work for FFS/UFS because gnop is a temporary >>> solution (needs to be done by hand at each reboot). For FFS/UFS you >>> need to align the slice/partition and chose a good blocksize/fragsize >>> combination (e.g. 32k/4k). > >> Thanks, Alexander. >> >> This is what I had expected after reading the man pages, though I >> would think -b 65560 -f 8192' would be a bit more reasonable in this >> day of bloated file formats. it's been years since I have hit a >> problem with lack of inodes. > > I suggest to test this somewhere first. I have no evidence that it can no= t > work, but the blocksize/fragsize settings where subject to some unexpecte= d > results in the past when they where changed to a bad combination. IIRC th= is > should be fixed now, but my memory may cheat on me... Alexander, Thanks for the advice. I would never try this on my system without a clone of the disk, especially with the limited experience I have with gpart and Lenovo's weird SYSTEM_DRV slice that seems to bite so many people. (Still can't find any good explanation of what it's about, but I do see a lot of incorrect ones.) --=20 R. Kevin Oberman, Network Engineer - Retired E-mail: kob6558@gmail.com
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