From owner-freebsd-scsi Sat Mar 25 15: 8:59 2000 Delivered-To: freebsd-scsi@freebsd.org Received: from sabre.velocet.net (sabre.velocet.net [198.96.118.66]) by hub.freebsd.org (Postfix) with ESMTP id A0E8437B8AA; Sat, 25 Mar 2000 15:08:52 -0800 (PST) (envelope-from dgilbert@office.tor.velocet.net) Received: from office.tor.velocet.net (trooper.velocet.net [216.126.82.226]) by sabre.velocet.net (Postfix) with ESMTP id C9CB2137FB3; Sat, 25 Mar 2000 18:08:50 -0500 (EST) Received: (from dgilbert@localhost) by office.tor.velocet.net (8.9.3/8.9.3) id SAA09328; Sat, 25 Mar 2000 18:08:50 -0500 (EST) (envelope-from dgilbert) From: David Gilbert MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <14557.18178.239025.747850@trooper.velocet.net> Date: Sat, 25 Mar 2000 18:08:50 -0500 (EST) To: freebsd-current@freebsd.org, freebsd-scsi@freebsd.org Subject: MegaRAID jiggles clock? X-Mailer: VM 6.75 under 20.4 "Emerald" XEmacs Lucid Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org I'm wondering if the AMI MegaRAID controller/driver might be the reason that I'm getting a large number of clock resets from ntpd. About every half hour, ntpd seems to feel the need to reset the clock on the server by about 1/3 of a second. The server has a moderate NFS load (going out through 12 dc interfaces) and an AMI MegaRAID 1400 controller with 8 disks in a RAID-5 config. I have other servers with 12 dc ports, and havn't seen any particularly bad time performance from them, which is why I'm suspicious of the megaraid. This machine is also using a motherboard common to many of our other machines. None of our other servers (we have a "ring" of 5 time servers to which all our internal hosts connect) or clients appear to have any issues. I have considered setting the option on ntpd to only adjust time by adjusting the frequency ... to see if this is just a bogon clock chip or somesuch. ideas? Dave. -- ============================================================================ |David Gilbert, Velocet Communications. | Two things can only be | |Mail: dgilbert@velocet.net | equal if and only if they | |http://www.velocet.net/~dgilbert | are precisely opposite. | =========================================================GLO================ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message