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Tag Archives: buffer credits
FPIN – The Holy Grail of SAN Stability
As some of you may recall about a decade ago I made a proposal to incorporate more intelligence into the end-devices to be able to better react to...
Cross-fabric collateral damage
Ever since the dawn of time the storage administrators have been indoctrinated with redundancy. You have to have everything at least twice in order to maintain uptime and...
Speed mismatch is the death-trap for shared storage
I’ve been focusing on the implications of physical issues a lot in my posts over the last ~2 years. What I haven’t touched on is logical performance boundaries...
Performance expectations with ISL compression
So this week I had an interesting case. As you know the Hitachi arrays have a replication functionality called HUR (Hitachi Universal Replicator) which is an advanced a-synchronous...
Buffer Credits for Newbies
Pretty often you get into some sort of mode whereby I forget that there are many youngsters getting their feet wet in the storage arena and some things...
Why FCoE is bad for Business (Continuity)
Sigh….. yet another post to debunk some FCoE marketing and explain in some more details why FCoE is not good for Business Continuity (or business in general)....
Brocade FOS 7.1 and the cool features
After a very busy couple of weeks I’ve spent some time to dissect the release notes of Brocade FOS 7.1 and I must say there are some really nice features...
The Emergency Health Threat (EHT) on Brocade FC fabrics
Since a couple of FOS versions ago Brocade wanted to fix the problem Fibre-Channel has by definition called credit back-pressure. The word “problem” overstated since in 99.99999% of...