Why virtual machine disks in Vsan are slow

Why virtual machine disks in Vsan are slow

a Netizen 2016/5/614:16:46
Hello, Miss Wang. I learned your Vsan tutorial in 51cto. I'd like to ask you a few questions.
Wang Chunhai 2016/5/614:17:04
You said
a Netizen 2016/5/614:20:35
I have a vsan cluster of 4 server groups, each of which is a 1-200G SSD plus 3 600Gsas groups of disk groups. Network is all gigabit network.
a Netizen 2016/5/614:21:52
Then the disk of the virtual machine running on it is slow to write and read. It's about 100M.
Wang Chunhai 2016/5/614:22:39
This is normal, your virtual machine, the default Sw=1 bar
This is the speed of a disk.
You set the sw=3, re-adjust the VM storage policy, sw=3, will be faster
a Netizen 2016/5/614:24:32
Why is it so low? My SSD is enterprise-class, read and write speed can reach 500M per second
Wang Chunhai 2016/5/614:24:58
Oh
If you look closely at the principle of Vsan, you understand.
Wang Chunhai 2016/5/614:25:28
In Vsan, 30% of SSD is used for read cache, 70% write cache.
You normally copy, test, these are not cached, so that is the speed of HDD disk
By default, the number of disk strips is sw=1, which is the single-block disk
You have three disks in your disk group, with a maximum of sw=3, three disks, or three disks that make up RAID0, which is faster.
a Netizen 2016/5/614:26:37
Well. I'll try, thank you, Miss Wang.
Wang Chunhai 2016/5/614:27:08
All right, you try and tell me.
A netizen 2016/5/614:27:58
Well.

a Netizen 15:00:13
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The number of bands is adjusted to 3 write speed of about 170. Reading speed approx. 150

As teacher Wang said, the speed increased. Cheshevin Teacher guidance.

"description" If you also want to learn about Vsan, learn "VMware Vsan real-start video course", the course link is

Http://edu.51cto.com/course/course_id-5248.html

This article from "Wang Chunhai blog" blog, declined reprint!

Why virtual machine disks in Vsan are slow