From mboxrd@z Thu Jan 1 00:00:00 1970 From: Luben Tuikov Subject: Re: A modern RAID solution? Date: Mon, 28 Oct 2002 23:37:58 -0500 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <3DBE10A6.5069E9F0@splentec.com> References: <20021027153048.GA5642@angle.setup.org> <3DBD7F44.3000804@mvista.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: List-Id: linux-scsi@vger.kernel.org To: Steven Dake Cc: Alexy Khrabrov , linux-scsi@vger.kernel.org Steven Dake wrote: > > multiple commands at once. RAID 5 will see improvement because the I/O > processors have special hardware to do 8 or 16 parallel XOR > calculations. Also generally I/O processors on the RAID cards run at I've long been thinking for a software RAID 5 which uses the REGENERATE/XD*/XP* SCSI Block device commands. For this reason I thought it useful for an application client to know if the command made it to the medium as I posted sometime ago (e.g. when SCSI core requests through eh_abort_handler()). -- Luben P.S. (I.e. with the current queuing models for some transports (and some of my drivers) it is possible to say that: the cancelled command made it / didn't make it to the medum (trivial) or that it is unknown whether it made it to the medium (only in this case we have to re-request to check).)