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Tag Archives: xiv

Is RAID Dead? No – Next Question

Portakabin Modular Construction I had a small discussion today with a few folks on Twitter that was a forerunner to a Wikibon “Peer Incite” discussion on whether RAID was still relevant or not (hence the title of this post).  It seems to me that perhaps the Wikibon discussion was a good way to introduce a “RAID beating” technology to the ... Read More »

Choosing Between Monolithic and Modular Architectures – Part II

This is a series of post discussing storage array architectures.  Previous posts: Choosing Between Monolithic and Modular Architectures – Part I In the first post, I discussed the shared storage model architectures typified by what we sometimes think of as Enterprise arrays, but I’ve called monolithic.  This term harks back to the mainframe days of large single computers (see Wikipedia ... Read More »

Enterprise Computing: The Benefits of Wide Striping – Avoiding A Long Tail

. The chart shows that in some array designs (typically the older Enterprise arrays), I/O distribution was not evenly balanced and so not all drives were being used to their full capacity.  This was mitigated by using tools to move LUNs or sub-LUNs around; alternatively concatenated devices like metas and LUSEs were employed to spread the load. The only real solution ... Read More »

Enterprise Computing: Is There Any Point Buying From EMC?

Yesterday, EMC announced Fully Automated Storage Tiering (FAST), their much hyped and much anticipated storage feature enabling the automated moving of data between tiers of storage on a policy basis.  However the most notable missing feature in the EMC announcement was the lack of support for legacy DMX-3 and DMX-4 platforms.  This to me sends a message loud and clear ... Read More »

Storage Predictions for 2009

It’s the end of another year and of course time to the obligatory posts on predictions in the industry for the next 12 months. True to form, I’ve spent some time thinking and here are my top 5 ruminations for the coming year. EMC join SPC. EMC will finally have the epiphany we’ve all been dreaming of and embrace the ... Read More »

Understanding EVA – revisited

Thanks to all those who posted in response to Understanding EVA earlier this week, especially Cleanur who added a lot of detail. Based on the additional knowledge, I’d summarise again: EVA disks are placed in groups – usually recommended to be one single group unless there’s a compelling reason not to (like different disk types e.g. FC/FATA). Disk groups are ... Read More »