Date: Thu, 5 Mar 1998 12:09:43 -0600 From: Karl Denninger <karl@mcs.net> To: "Justin T. Gibbs" <gibbs@plutotech.com> Cc: hackers@FreeBSD.ORG Subject: Re: SCSI Bus redundancy... Message-ID: <19980305120943.00850@mcs.net> In-Reply-To: <199803051745.KAA21520@pluto.plutotech.com>; from Justin T. Gibbs on Thu, Mar 05, 1998 at 10:42:27AM -0700 References: <19980305085654.20326@mcs.net> <199803051745.KAA21520@pluto.plutotech.com>
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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
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