Date: Thu, 2 Nov 2000 13:57:54 -0800 From: Alfred Perlstein <bright@wintelcom.net> To: Matt Dillon <dillon@earth.backplane.com> Cc: Marius Bendiksen <mbendiks@eunet.no>, Randell Jesup <rjesup@wgate.com>, arch@FreeBSD.ORG Subject: Re: Like to commit my diskprep Message-ID: <20001102135754.Y20567@fw.wintelcom.net> In-Reply-To: <200011022135.eA2LZA740940@earth.backplane.com>; from dillon@earth.backplane.com on Thu, Nov 02, 2000 at 01:35:10PM -0800 References: <200011021725.eA2HPeM38718@earth.backplane.com> <Pine.BSF.4.05.10011022216250.13255-100000@login-1.eunet.no> <20001102132140.W20567@fw.wintelcom.net> <200011022135.eA2LZA740940@earth.backplane.com>
next in thread | previous in thread | raw e-mail | index | archive | help
* Matt Dillon <dillon@earth.backplane.com> [001102 13:36] wrote: > > : > :* Marius Bendiksen <mbendiks@eunet.no> [001102 13:19] wrote: > :> > Not to mention the bytes/inode (-i) If you want fsck to go fast on a > :> > big filesystem, reducing the number of inodes helps a lot. I find myself > :> > using -i 32768 or -i 65536 or even higher numbers on partitions which > :> > hold big database files. > :> > :> FFS is woefully inadequate at handling databases, due to the block > :> indirection, but e.g. Oracle will allow you to run directly on top > :> of a device. > : > :Block indirection could be optimized by attempting to allocate > :indirect blocks in the same area as either the inode or datablocks > :that the indirect blocks address. > > Indirect blocks aren't relevant if you are using a large block size, > because there are few enough of them the OS has no problem caching > them. the problem isn't caching them, it's fsyncing them during appends that cause additinal disk seeks. But that's not exactly a deadly problem, just a little suboptimal. it's also fsyncs on newly created files that can cause problems. -- -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] "I have the heart of a child; I keep it in a jar on my desk." 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?20001102135754.Y20567>