Date: Fri, 07 Dec 2001 14:15:00 +0000 From: Ian Dowse <iedowse@maths.tcd.ie> To: Sheldon Hearn <sheldonh@starjuice.net> Cc: Matthew Dillon <dillon@apollo.backplane.com>, Kirk McKusick <mckusick@beastie.mckusick.com>, freebsd-arch@FreeBSD.ORG Subject: Re: Using a larger block size on large filesystems Message-ID: <200112071415.aa41493@salmon.maths.tcd.ie> In-Reply-To: Your message of "Fri, 07 Dec 2001 15:35:34 %2B0200." <31807.1007732134@axl.seasidesoftware.co.za>
next in thread | previous in thread | raw e-mail | index | archive | help
In message <31807.1007732134@axl.seasidesoftware.co.za>, Sheldon Hearn writes: > >The only other thing I can think of is what obrien suggested. He told >me that it might be that people are wary of a filesystem that contains >only a single cylinder group, as this means you only have one >superblock. Just to clarify, each cylinder group has one backup superblock. This is in addition to the master superblock, so on a filesystem with just one cylinder group there will be 2 superblocks. However, the first backup superblock is located immediately after the master superblock, so some of the benefits of extra superblocks (fsck sanity tests, recovery from the begininning of a disk getting overwritten) are lost when there is just one cylinder group. Ian To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200112071415.aa41493>