Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!psuvax1!news From: ehrlich@cs.psu.edu (Daniel Ehrlich) Newsgroups: comp.unix.aix Subject: Re: file system speed (was Risc System/6000) Message-ID: Date: 23 Feb 90 15:44:55 GMT References: <1660@aber-cs.UUCP> <6238@orca.wv.tek.com> Sender: news@cs.psu.edu (Usenet) Followup-To: comp.unix.aix Organization: Computer Science Department, Penn State University Lines: 24 In-Reply-To: andrew@frip.WV.TEK.COM's message of 23 Feb 90 04:55:23 GMT In article <6238@orca.wv.tek.com> andrew@frip.WV.TEK.COM (Andrew Klossner) writes: Andrew> [] Andrew> "You cannot get more than 600KB per second out of the Andrew> filesystem in the best of circumstances, and even that is only Andrew> achieved, as far I know, by the MIPS UNIX. Others top out at Andrew> around 300KB per second." Andrew> This doesn't sound right. I just tried sequential disk reads from a Andrew> large file on a Tektronix XD88 (88k-based) workstation and got Andrew> 650KB/sec. Even our wimpy 68020-based systems get 450KB/sec. This Andrew> through a slow SCSI channel, and the file system is Berkeley FFS. I can not speak to the speed of the file system on AIX, but it is a `new and improved' file system. :-) I still have not found all of the details in the documentation. It does have an `atomic transaction log' (my term, not IBM's) that allows fsck to quickly rebuild a damaged file system. As I wade through the docs and find more info I will post again. -- Dan Ehrlich Voice: +1 814 863 1142 FAX: +1 814 865 3176