From owner-freebsd-hackers Thu Mar 5 10:09:57 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id KAA20777 for freebsd-hackers-outgoing; Thu, 5 Mar 1998 10:09:57 -0800 (PST) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from Kitten.mcs.com (Kitten.mcs.com [192.160.127.90]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id KAA20702 for ; Thu, 5 Mar 1998 10:09:44 -0800 (PST) (envelope-from karl@Mars.mcs.net) Received: from Mars.mcs.net (karl@Mars.mcs.net [192.160.127.85]) by Kitten.mcs.com (8.8.7/8.8.2) with ESMTP id MAA07798; Thu, 5 Mar 1998 12:09:43 -0600 (CST) Received: (from karl@localhost) by Mars.mcs.net (8.8.7/8.8.2) id MAA20077; Thu, 5 Mar 1998 12:09:43 -0600 (CST) Message-ID: <19980305120943.00850@mcs.net> Date: Thu, 5 Mar 1998 12:09:43 -0600 From: Karl Denninger To: "Justin T. Gibbs" Cc: hackers@FreeBSD.ORG Subject: Re: SCSI Bus redundancy... References: <19980305085654.20326@mcs.net> <199803051745.KAA21520@pluto.plutotech.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.84 In-Reply-To: <199803051745.KAA21520@pluto.plutotech.com>; from Justin T. Gibbs on Thu, Mar 05, 1998 at 10:42:27AM -0700 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG My concern for these is as follows: 1) The devices on the RAID arrays are high-availability required machines (ie: primary NFS fileservers, News service, and the authentication database machines). NONE OF THESE can afford to be down or crash. 2) -CURRENT at present has a reputation for having some trouble, particularly at the kernel level. I'm running mid-November kernels and operating system releases on these machines right now due to this. That release *is* stable in these uses. Am I asking for major trouble if I up-rev to a recent (like last night) -CURRENT? -- -- Karl Denninger (karl@MCS.Net)| MCSNet - Serving Chicagoland and Wisconsin http://www.mcs.net/ | T1's from $600 monthly to FULL DS-3 Service | NEW! K56Flex support on ALL modems Voice: [+1 312 803-MCS1 x219]| EXCLUSIVE NEW FEATURE ON ALL PERSONAL ACCOUNTS Fax: [+1 312 803-4929] | *SPAMBLOCK* Technology now included at no cost On Thu, Mar 05, 1998 at 10:42:27AM -0700, Justin T. Gibbs wrote: > >Will going to paged SCBs do this? > > SCB paging gives you the potential to have up to 255 transactions > outstanding, but with the current SCSI system, bumping the transaction > count that high can be hazardous. I would suggest trying the next CAM > snapshot on this box and see how the performance changes. The CAM driver > defaults to 64 tags per device but that can safely and easily be changed > up to 255 with a quirk entry. > > It looks like the next snapshot will come out on either Friday or Saturday > of this week. > > >-- > >Karl Denninger (karl@MCS.Net)| MCSNet - Serving Chicagoland and Wisconsin > >http://www.mcs.net/ | T1's from $600 monthly to FULL DS-3 Service > > | NEW! K56Flex support on ALL modems > >Voice: [+1 312 803-MCS1 x219]| EXCLUSIVE NEW FEATURE ON ALL PERSONAL ACCOUNTS > >Fax: [+1 312 803-4929] | *SPAMBLOCK* Technology now included at no cost > > -- > Justin > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message