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Queue depth calculation for target and initiators.

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What is Queue depth? It is the number of I/O operations that can run in parallel on a LUN/blocks. Generally, it specifies the number of outstanding requests per LUN. It is the number of I/O requests that the initiator can send and receive per LUN. Each I/O request from the host’s initiator HBA to the storage target adapter ingests a queue entry. Typically, a higher queue depth equates to improved performance. However, if the storage controller’s maximum queue depth is reached, that storage controller discards incoming I/O request by returning queue full response to the initiator, causing bottlenecks and latency issues. The following general recommendations can be made about "tuning" queue depths. For small to mid-size systems, use a HBA queue depth of 32. For large systems, use a HBA queue depth of 128. For exception cases or performance testing, use a queue depth of 256 to avoid possible queuing problems. All hosts should have the queue d...
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Storage disk iops and capacity design

Most of  the storage engineers experienced with performance and latency issues, This starts from the infrastructure design and deployment phase which was not planned in-order to satisfy the future load. Here I have described the disk's types and it iops capacity which may help in better understanding for the future new deployments. Commonly used disk types in storage's: DiskType Expansion SATA  Serial Advanced Technology Attachment, often abbreviated SATA or S-ATA FC  Fiber Channel disks SAS Serial Attached SCSI SSD  Solid-state disks IOPS: Input output per seconds, IOPS are used to define the performance of a given disk or disk array. RPM Max Iop’s 5.4K RPM   50-80   7.2K RPM   75-100 10K RPM 125-150 15K RPM   175-210  Two  features which involves in iops calculation Average latency Average seek time Two type...
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BMC Could Life Cycle Managment an Overview.!

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BMC-CLM CLOUD LIFE CYCLE MANAGEMENT AN OVERVIEW: BMC Cloud Lifecycle Management brings together the benefits of traditional IT management, including operational excellence, automation, and service delivery models, and merges them with the dynamic potential of cloud architectures. It provides the foundation for a strong, flexible, and valuable cloud infrastructure that supports IT operations and delivers exceptional service quality to the business. FEATURES AND FUNICTIONALITY OF BMC CLOUD LIFE CYCLE: Support for different cloud infrastructure options: Citrix XenServer, VMware vSphere, VMware vCloud Director, Openstack, IBM pSeries, Microsoft Hyper-V, Amazon Web Services, Savvis, Terremark etc. Support for different guest operating systems on virtual and physical systems: Redhat Linux, Microsoft Windows 2008 and 2012, IBM AIX, SUSE Linux Enterprise Server, Oracle Enterprise Linux Self-service portal for business users: deliver complete, configurable services without IT intervention ...
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