Tag Archives: performance

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...

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Config Guide, Fibre Channel, Storage Networking, Troubleshooting , , ,

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...

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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...

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Closing the Fibre-Channel resiliency gap

Fibre-Channel is still the predominant transport protocol for storage related data transmission. And rightfully so. Over the past +-two decades it has proven to be very efficient and [..]

Fibre Channel , , , , ,

Brocade Fabric Watch – The most underutilised feature

Many customer cases I handle are related to poor connectivity. A connectivity problem can be caused by unclean connectors, broken cables or SFP’s. (See one of my earlier [..]

Brocade, Fibre Channel , ,

SCSI UNMAP and performance implications

When listening to Greg Knieriemens’ podcast on Nekkid Tech there was some debate on VMWare’s decisision to disable the SCSI UNMAP command on vSphere 5.something. Chris Evans (www.thestoragearchitect.com)...

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Why disk drives have become slower over the years

What is the first question vendors get (or at least used to get) when a customer (non-technical) calls???I’ll spare you the guesswork: “What does a TB of disks [..]

Storage Networking , , , , ,