nixCraft

Hello users,

I need to know, how to check read and write latency of disk on Linux VPS

Use iostat command.

1. How do I find out Linux Disk utilization?

Another option is to turn on system accounting and use sar command - How do I Find Out Linux CPU Utilization?

What kind of VPS do you use? Is it XEN or VMWARE? Some VPS may provide other tools to get more info.. let me know.

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Vivek Gite
Linux Evangelist
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For virtualization we are using vmware esx. Blade are intel based.

I saw difference in two server

1: a raw server normal one, that is having 4 GB RAM and 4 CPUs Quad Core.
2: virtual server and configuration is same as above one.


When i install any thing on 1st one, it do very fast as compare of Virtual. Is virtualization has some performace impact (lower) as compare with raw server?

Regards
manish singh

Virtualization adds extra layer, so you will see some differences. Also, virtualization disk performance depends upon local RAID array. It is better to use high performance SAN (if possible).
Hardware RAID 10 with 15k SCSI disk will give best performance for RAID.
SAN 1Gbps network storage give good performance.

However, tuning disk subsystem performance is critical. What kind of storage do you use? Did you tuned your storage and server? A few tips:

• Increased the VMFS3 max heap size (KB # 1004424).
• See if you can changed the storage processor’s cache (if you are using FC storage).
• Try to increase the guest queue length.

See http://www.vmware.com/pdf/vi_performance_tuning.pdf

__________________
Vivek Gite
Linux Evangelist
Be proud RHEL user, and let the world know about your enterprise choices! Join RedHat user group.
Always use CODE tags for posting system output and commands!
Do you run a Linux? Let's face it, you need help

we are using inbuilt Storage, It's a intel based blade server.