Date: Mon, 18 Jun 2007 07:33:12 -0700 From: Scott Long <scottl@samsco.org> To: emaney <smsrks2007@gmail.com> Cc: freebsd-scsi@freebsd.org Subject: Re: simple SCSI question Message-ID: <467697A8.3080503@samsco.org> In-Reply-To: <11169093.post@talk.nabble.com> References: <11169093.post@talk.nabble.com>
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emaney wrote: > iam a student and new to SCSI, i have a question please someone help me to > get the answer for this > following question > how an ‘initiator’ on a SCSI bus identifies the logical entity with which it > wants to communicate? > > can anyone help me with this question, iam not getting whats is logical > entity A parallel SCSI initiator will do two steps to identify the "logical entity" that it wants to talk to. First, it'll select the target by raising a signal on one of the 16 data lines. Once the target has responded, the initiator will send a series of 1 or more message bytes that identify the LUN inside the target that the upcoming command is for. This is a gross simplification of how the SCSI wire protocol works, and I suggest reading some of the docs on www.t11.org for more information. Scotthelp
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