From owner-freebsd-scsi Sat Sep 28 04:15:41 1996 Return-Path: owner-freebsd-scsi Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id EAA08544 for freebsd-scsi-outgoing; Sat, 28 Sep 1996 04:15:41 -0700 (PDT) Received: from smtp.utexas.edu (smtp.utexas.edu [128.83.126.2]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id EAA08515 for ; Sat, 28 Sep 1996 04:15:37 -0700 (PDT) Received: (qmail-queue invoked by uid 0); 28 Sep 1996 11:15:35 -0000 Received: from unknown (HELO mail.utexas.edu) (128.83.126.1) by smtp.utexas.edu with SMTP; 28 Sep 1996 11:15:35 -0000 Received: from [208.2.87.4] (cod.dataplex.net [208.2.87.4]) by mail.utexas.edu (8.6.9/8.6.6) with SMTP id GAA08833; Sat, 28 Sep 1996 06:15:34 -0500 X-Sender: rkw@eel.dataplex.net Message-Id: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Sat, 28 Sep 1996 06:15:34 -0500 To: mika ruohotie From: rkw@dataplex.net (Richard Wackerbarth) Subject: Re: striping/mirroring? Cc: scsi@freebsd.org Sender: owner-freebsd-scsi@freebsd.org X-Loop: FreeBSD.org Precedence: bulk >> Look at what striping does... >> It takes a number of drives and makes it appear that they are one large >> (faster) drive. > >i know > >> Mirroring takes two drives of the same size and stores the information >> redundantly. > >i know > >> Thus if you were to mirror a 4 drive combination to a single drive, that >> drive would have to be 4 times as large. It would also need to be fast. > >it should be huge, yes. fast, no, if i dont want to mirror all i am >striping... or if i do the way i was planning... using 2 gig drives, >and only _use_ the space of one disk i'm mirroring to... I'm lost. How can the mirror be slower than the drive that it is mirroring unless it is a "read mostly" situation and you are guaranteed no write bursts? >original question was, can i do it with freebsd? > >seems to me answer is no. I think that the answer is "yes". You can you elaborate? Describe the configuration that you have in mind.