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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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PowerCli One-liners for VMware.

This post covers some powercli "One Liners" which will help the VMware admin's to make the day smooth and simplify their day-to-day tasks on VMware. Here we go...  Query the vmware tools on all virtual machines get-vm |% { get-view $_.id } | select Name, @{ Name=”Tools Status”; Expression={$_.guest.toolsstatus}}, @{ Name=”Tools Running Status”; E=$_.guest.toolsrunningstatus}} Query the nic type of all virtual machines Get-VM | Get-NetworkAdapter | Select-Object Parent,Type Query the disk type of all virtual machines get-vm | foreach-object -process {get-harddisk $_} | select-object storageformat | format-list Get VMs with Memory Reservations Get-VM | Get-VMResourceConfiguration | Where {$_.MemReservationMB -ne 0} | Select VM,MemReservationMBGet-VM | Get-VMResourceConfiguration | Where {$_.MemReservationMB -ne 0} | Select VM,MemReservationMB Get VMs with CPU Reservations: Get-VM | Get-VMResourceConfiguration | Where {$_.CpuReservationMhz -...
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