sara2000
asked on
Disk latency. for VM
Expert out there, I need your help on improving disk latency on a VM.
We have a VM with eight disks that are configured with LSI logic scsi controller with 10 cores vcpu. The backend storage is Dell EMC VNX.
The software vendor ran a simulation and found that the server has disk latency. I was asked to tune the server.
He mentioned that the latency is at 64 KrW and 64KrR and it has to be below 10Ms vs 20Ms.
What would you advise me to do in this case?
We have VMware 6.7 and Dell R730 Esxi hosts in the cluster.
We have a VM with eight disks that are configured with LSI logic scsi controller with 10 cores vcpu. The backend storage is Dell EMC VNX.
The software vendor ran a simulation and found that the server has disk latency. I was asked to tune the server.
He mentioned that the latency is at 64 KrW and 64KrR and it has to be below 10Ms vs 20Ms.
What would you advise me to do in this case?
We have VMware 6.7 and Dell R730 Esxi hosts in the cluster.
David Johnson, CD
8 disks (of what type?) in which RAID? try 7 SAS disks and 1 SSD (caching) in a raid 5 or raid 6 or use raid 10
ASKER
David,
I have VM and they are VMDK disks from a VNX LUN which is from a pool and the pool has SSD,SAS and SATA.
I have VM and they are VMDK disks from a VNX LUN which is from a pool and the pool has SSD,SAS and SATA.
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ASKER
Thanks, Andrew,
If a vendor asks me to a VM with x amount iops or will need x amount of iops.
How do I provision that VM to meet that requirement?
I have never been to that situation, I just go and install the VM do not care about the iops, only care about cpu and memory!!
If a vendor asks me to a VM with x amount iops or will need x amount of iops.
How do I provision that VM to meet that requirement?
I have never been to that situation, I just go and install the VM do not care about the iops, only care about cpu and memory!!
You need to understand what IOPS your datastore can provide, and what it has been designed to perform.
You may be chasing your tails, in that your storage cannot meet the criteria.
You may be chasing your tails, in that your storage cannot meet the criteria.
Storage
Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.
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