Date: Thu, 23 Sep 2004 17:51:49 -0400 From: Stephan Uphoff <ups@tree.com> To: Julian Elischer <julian@elischer.org> Cc: "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: Re: AoE for 4.x Message-ID: <1095976309.53798.8390.camel@palm.tree.com> In-Reply-To: <41533E0D.9000908@elischer.org> References: <Pine.LNX.4.60.0409211531450.32120@athena> <41508FEB.6030203@elischer.org><20040923191423.GE61631@FreeBSD.org> <41532FA0.6030405@elischer.org><41533E0D.9000908@elischer.org>
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Since a complete disk operation in AoE is encapsulated in a single Ethernet request/response pair - The data size of a read/write operation is smaller than a single page. I don't think any existing framework can deal with this efficiently. Stephan On Thu, 2004-09-23 at 17:20, Julian Elischer wrote: > you could look at the sbp driver that is part of the firewire code.. > I think that may be the closest analog. > > > Sam wrote: > > > On Thu, 23 Sep 2004, Julian Elischer wrote: > > > >> I think that if you have a working driver we can assign you a number. > >> I do have some questions however.. > >> > >> this is AoE.. is it not possible at all to combne it with either the CAM > >> framework (such as the atapicam stuff) or the existing ATA stuff.. > >> Don't take this the wrong way.. it's just a question.. > >> CAM is being used to talk to drives over firewire, usb, ata, scsi, > >> fibrechannel. > >> it would seem that to unify this would be something that we should > >> look at.. > >> Of course CAM itslef is showing its age in soem places and it could > >> do with some work itself.. > > > > > > It might be possible to plug into the CAM; I only briefly > > glanced at it and it didn't appear appropriate. The ATA > > layer definitely isn't as parts of ATA don't make sense > > in this context (Read DMA, Read Multiple, eg) and AoE > > devices don't conform to the simple hardware probe/attach > > methodology (as I understand it). > > > > I would love to be proved wrong. I'm always willing to > > try a new approach if it's demonstrably better. > > > > Sam > > > _______________________________________________ > freebsd-arch@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-arch > To unsubscribe, send any mail to "freebsd-arch-unsubscribe@freebsd.org" > >
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