Comments for SAN Training http://www.santrainingblog.com Storage Area Networking Sat, 10 Jul 2010 19:07:28 -0700 http://wordpress.org/?v=2.9.2 hourly 1 Comment on Online SAN Training – SCSI Architecture & Commands by Greg http://www.santrainingblog.com/2010/07/online-san-training-scsi-architecture-commands/comment-page-1/#comment-32 Greg Sat, 10 Jul 2010 19:07:28 +0000 http://www.santrainingblog.com/?p=314#comment-32 Just so everyone knows, the times for this online training course is from <strong>1PM to 5 PM Pacific time</strong>. This is for this class only, as there was a scheduling issue. Just so everyone knows, the times for this online training course is from 1PM to 5 PM Pacific time. This is for this class only, as there was a scheduling issue.

]]> Comment on Tagged Command Queuing by ocozette http://www.santrainingblog.com/2010/06/tagged-command-queuing/comment-page-1/#comment-30 ocozette Mon, 21 Jun 2010 16:41:38 +0000 http://www.santrainingblog.com/?p=288#comment-30 There are also another tiny benefit, queuing! We have the time to transfer data over the SATA bus, and the time consumed by disk controller to read/write to the disk. So, with NCQ (and SCSI with TCQ) the total time is the maximum of these two times, with the old ATA/IDE drive it was the sum of these two times. However, the SATA bandwidth is higher than disk speed, so it's only 10 to 15% of improvement. There are also another tiny benefit, queuing!

We have the time to transfer data over the SATA bus, and the time consumed by disk controller to read/write to the disk.

So, with NCQ (and SCSI with TCQ) the total time is the maximum of these two times, with the old ATA/IDE drive it was the sum of these two times.

However, the SATA bandwidth is higher than disk speed, so it’s only 10 to 15% of improvement.

]]> Comment on Asynchronous Event Notification (AEN) by Greg http://www.santrainingblog.com/2010/04/asynchronous-event-notification-aen/comment-page-1/#comment-28 Greg Mon, 31 May 2010 23:51:56 +0000 http://www.santrainingblog.com/?p=247#comment-28 We may not have "formal" AEN or AER, but the concepts are important when putting together a system. We may not have “formal” AEN or AER, but the concepts are important when putting together a system.

]]> Comment on Contingent Allegiance Condition (CAC) by Greg http://www.santrainingblog.com/2010/04/contingent-allegiance-condition-cac/comment-page-1/#comment-27 Greg Mon, 31 May 2010 23:51:01 +0000 http://www.santrainingblog.com/?p=239#comment-27 It is always good to have a little "history" about how things evolve. I wonder why Ralph didn't mention my proposal back in 1996? It is always good to have a little “history” about how things evolve. I wonder why Ralph didn’t mention my proposal back in 1996?

]]> Comment on iSCSI Training Course by Greg http://www.santrainingblog.com/2010/03/iscsi-training-course/comment-page-1/#comment-26 Greg Mon, 31 May 2010 23:49:29 +0000 http://www.santrainingblog.com/?p=204#comment-26 We have used various versions of iSCSI initiators and targets. We like to keep it flexible during our labs. We have used various versions of iSCSI initiators and targets. We like to keep it flexible during our labs.

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