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Storage Ruminations
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Best Practices for Symmetrix Configuration
Considerations Configure enough resources for your workload Use resources evenly for best overall performance Spread across all available components Includes FE, BE and disks Path management can help FE FAST/Optimizer can help BE Commonly asked questions What size system do I need? Each resource has a limit of I/Os per second and MBs [...]
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Performance as a Function of Utilization on CLARiiON
Measurements Utilization = 100% * busy time in period / (idle + busy) time in period Throughput = total number of visitors in periods / period in length in seconds Average Busy Queue Length = sum of queue upon arrive of visitor x / total number of visitors Queue length = ABQL * utilization/100% Response [...]
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VMotion over Distance with VPLEX
Vmotion without VPLEX Cannot directly perform Vmotion since storage is not shared Must first perform storage Vmotion Vmotion with VPLEX Enables direct Vmotion between data centers Storage Vmotion is no longer required Replicate the data once then move the VMs at will Use Cases Data Center Load Balancing Optimize resources across several [...]
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Converged Data Center: FCoE, iSCSI, and the Future of Storage Networking
Stuart Miniman, Office of the CTO The Journey to Convergence The iSCSI Story Transport SCSI over standard Ethernet Reliability through TCP SCSI has limited distance, iSCSI extended the distance Non-Ethernet Convergence Options Infiniband Used broadly for High Performance Computing (HPC) environment Low cost and ultra-low latency geared for server to server cluster [...]
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Unisphere Hands-on
Overview Supports all previous features of Navisphere and Celerra Manager Unisphere can manage Clariions running FLARE 19 and above Unisphere can manage Celerra systems with DART 6.0 CLI still separate and unchanged for CX and Celerra Off-array packages also available for Unisphere Slated the July 2010 timeframe Experience Notes: The reporting was snappy. [...]
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VPLEX Birds-of-a-Feather
GA was April 15th, 2010. No snapshotting features today Front-end Limitations 400 initiators, 200 hosts – this is for 1/2/4 engine VPLEX This is the supported number today, plans are to have it increase There are futures to add asynchronous WAN capabilities into the product in order to extend the distance, but [...]
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Flash Architecture
Flash drives are like little storage systems Memory buffer Buffers hold index of all locations Buffers incoming writes Buffer resiliency Power capacitors maintain power to the buffer in the event of system power failure Contents are then written to the persistent store if power fails Pages Cells are addressed by pages 73GB and 200GB [...]
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Architecture Deep Dive for VPLEX
What is it? Storage federation platform that extends storage beyond the boundaries of the data center Distributed, peer-to-peer, fault-tolerant storage system What problem does it solve? Simultaneous access to storage devices from two distinct locations Planned data mobility within, across and between data centers What’s unique? Clusters can scale out and scale [...]
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Transitioning to Auto-Provisioning Groups
Auto-provisioning groups look to replace the traditional symmasking functionality and definitely simplifies the provisioning process. 3 Grouping Objects Storage groups: symaccess -sid 1234 create -type storage -name mystorage -devs 050:053 Port groups: symaccess -sid 1234 -type port -name myports -dirport 7e:0, 8:e0 Initiator groups: symaccess -sid 1234 create -type initiator -name myinit -file [...]
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Virtual Provisioning Best Practices with Symmetrix VMAX
VP simplifies drive and DA workload distribution but doesn’t distribute performance across Fas. Pool Count, Fewer Pools for Easier Management Segregation by Application Separate applications that require consistent performance Avoids unexpected disk queuing if critical apps have dedicated disks Segregation by Use Separate database tables and log Separate backup media, such as clones [...]
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SANArtisan 
