Date: Mon, 13 Dec 1999 07:03:41 -0600 From: Karl Denninger <karl@Denninger.Net> To: dg@root.com, Mike Smith <msmith@FreeBSD.ORG> Cc: Oliver Blasnik <ob@omnilink.net>, freebsd-scsi@FreeBSD.ORG Subject: Re: Again: CRD-Raid-Controller and FreeBSD 3.x Message-ID: <19991213070341.C20023@Denninger.Net> In-Reply-To: <199912131033.CAA06144@implode.root.com>; from David Greenman on Mon, Dec 13, 1999 at 02:33:10AM -0800 References: <199912131014.CAA21782@mass.cdrom.com> <199912131033.CAA06144@implode.root.com>
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On Mon, Dec 13, 1999 at 02:33:10AM -0800, David Greenman wrote: > >> Mike Smith wrote: > >> > >> > No. FreeBSD starts assuming that a drive will handle 64 tags, but it > >> > expects that the drive will correctly report a queue-full condition so > >> > that it can dynamically adjust this number downwards. > >> > >> And this could not work as far these maximum of 32 commands is host-based, not lun-based. > > > >That would depend on the configuration of the unit. It'd work well for > >the single-drive case. > > > >> > This may solve the "problem", but it will substantially degrade > >> > performance in the case where there's only one array on the controller. > >> Right. But on the other hand enables tq without bothering on system-crashed :) > >> Better slow than not running. > > > >Perhaps. Better fixed firmware than terrible performance. > > I've been reading all of this and I'm still wondering what this is all > about. TeraSolutions has many of the CRD-5440-104 (LVD version) controllers > in the field and have never had problems with them. > > -DG I used to have a bunch of these controllers in production use as well, never saw this kind of problem with them, and they DID reduce the number of tag slots from 64 downward automatically (they DO properly report queue-full). This has to be a new firmware bug - I haven't run one in about a year, but prior to that time they DID work as expected. -- -- Karl Denninger (karl@denninger.net) Web: http://childrens-justice.org Isn't it time we started putting KIDS first? See the above URL for a plan to do exactly that! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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