From owner-freebsd-scsi Wed Dec 3 05:23:48 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id FAA07530 for freebsd-scsi-outgoing; Wed, 3 Dec 1997 05:23:48 -0800 (PST) (envelope-from owner-freebsd-scsi) Received: from mail.netcetera.dk (root@sleipner.netcetera.dk [194.192.207.2]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id FAA07523 for ; Wed, 3 Dec 1997 05:23:42 -0800 (PST) (envelope-from leifn@image.dk) Received: (from uucp@localhost) by mail.netcetera.dk (8.8.8/8.8.8) with UUCP id OAA04251 for freebsd-scsi@freebsd.org; Wed, 3 Dec 1997 14:20:51 +0100 Received: by swimsuit.roskildebc.dk (0.99.970109) id AA07706; 03 Dec 97 14:15:01 +0100 From: leifn@image.dk (Leif Neland) Date: 03 Dec 97 14:05:39 +0100 Subject: how to write shorter blocks with Adaptec 1542A? Message-ID: <55f_9712031415@swimsuit.roskildebc.dk> Organization: Fidonet: UNIX-sysadm søger job To: freebsd-scsi@freebsd.org Sender: owner-freebsd-scsi@freebsd.org X-Loop: FreeBSD.org Precedence: bulk I have a problem with my Adaptec 1542A writing bursts of 0xff at block-boundaries (0x2001,0xc001 etc), but only on fbsd-partitions, not on msdos-mounted partitions. The reason should be that the msdos driver only writes in blocks <=4K, whereas the ffs(?) driver writes larger blocks. I have been told to reduce the blocksize by means of minphys(), but I really don't know how. I have searched /usr/src/scsi/*, and have found some mentioning of minphys, but not how to limit the size. If somebody could explain it in simple terms, I would be most gratefull(sp?) Leif Neland leifn@image.dk --- |Fidonet: Leif Neland 2:234/49 |Internet: leifn@image.dk