Date: Wed, 18 Mar 1998 11:04:35 -0700 (MST) From: "Kenneth D. Merry" <ken@plutotech.com> To: mjacob@feral.com (Matthew Jacob) Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: anyone using a CD changer with CAM? Message-ID: <199803181804.LAA21354@panzer.plutotech.com> In-Reply-To: <199803181755.JAA06950@feral.com> from Matthew Jacob at "Mar 18, 98 09:55:16 am"
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Matthew Jacob wrote... > Okay... I can check it - I have a couple of those nakamichi seven disk > changers... Thanks. I think that's the same thing I've got: cd2 at adv1 bus 0 target 1 lun 0 cd2: <NRC MBR-7 111t> Removable CD-ROM SCSI2 device cd2: 3.300MB/s transfers cd2: cd present [76652 x 2048 byte records] You'll want to probably play around with the following sysctl variables, and adjust things to suit your usage pattern: kern.cam.cd.changer.min_busy_seconds: 3 kern.cam.cd.changer.max_busy_seconds: 11 The only requirement is that the min should be less than the max, and they should both be > 1. In practice, I've found that higher timeouts than that are preferrable. (like maybe 10 seconds for the minimum, and 15 or so for the maximum) Once you settle on a "good" timeout, you can hard-code it in your kernel config file with the following options: (taken from LINT) options "CHANGER_MIN_BUSY_SECONDS=2" options "CHANGER_MAX_BUSY_SECONDS=10" There isn't yet a way to specify different timeouts for different changers, but I guess if someone wants it, I can look into it. Ken -- Kenneth Merry ken@plutotech.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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