Date: Mon, 21 Sep 1998 14:20:59 -0600 (MDT) From: "Kenneth D. Merry" <ken@plutotech.com> To: dnelson@emsphone.com (Dan Nelson) Cc: kuku@gilberto.physik.RWTH-Aachen.DE, freebsd-current@freefall.cdrom.com, freebsd-scsi@FreeBSD.ORG Subject: Re: ncr - new log messages appearing Message-ID: <199809212020.OAA08872@panzer.plutotech.com> In-Reply-To: <19980921142849.A28314@emsphone.com> from Dan Nelson at "Sep 21, 98 02:28:49 pm"
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Dan Nelson wrote... > In the last episode (Sep 21), Christoph Kukulies said: > > > > Just FYI, don't know whether I should bother but since the recent > > upgrade to -current (aout) I'm seeing the following log messages: > > > > Sep 21 20:35:58 blues /kernel: (da0:ncr0:0:0:0): tagged openings now 15 > > That just means your drive can't handle more than 15 tagged commands at > once. CAM's max is 64 (is there any way to raise this?), so the first > time your system hits the disk heavily, your drive will complain about > the number of tags it can't handle, and the kernel message will pop up. You can adjust the maximum by adjusting the default quirk entry in cam_xpt.c or by putting in a specific quirk entry for your device that sets the limit higher. Most drives don't have any more than 64 tags. I think there are some external RAID controllers that may have more. > There's no way to query the drive for this information (as far as I > know), so the system basically tries to use as many tagged commands as > possible until the drive complains. Although some drives, like the Atlas II, will keep returning queue full until we've reduced the number of tags to 0. That's why we've got quirk entries that set the lower limit for those drives to 24. > Some of Netware's SCSI drivers print the same messages. It's actually > nice to see the message; then I know what drives not to buy next time > :) Yep. Many (most?) of the better Seagates handle 63 tags. My IBM Ultrastar 9ZX has 64. Ken -- Kenneth Merry ken@plutotech.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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