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Debian Drive transfer speed on VMware ESX
I have an unusual problem with Disk transfer speeds on a virtual Linux environment.
This environment consists of an ESX host running 3i, 3.5.0, 153875 and 2 Debian 5.0 Linux virtual machines.
When booting the machines have a hdparm transfer rate output of:
Timing cached reads: 1418 MB in 2.00 seconds = 707.95 MB/sec
Timing buffered disk reads: 132 MB in 3.01 seconds = 43.93 MB/sec
After a couple of days, the machines become sluggish and the same test produces:
Timing cached reads: 162 MB in 2.00 seconds = 80.99 MB/sec
Timing buffered disk reads: 12 MB in 3.78 seconds = 3.18 MB/sec
The command that is being run is hdparm -tT /dev/sda
Any ideas on why this is occurring, I cant see anything obvious in the logs that will cause this.
8/22/2022 - Mon
Is your vm configured with IDE drives?
No its an ESX server, you are only able to choose SCSI Devices.
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I have turned off VSMP on both boxes and have restarted them. Now all we have to do is wait until they slow down again now!
I have also removed more than one core from the virtual machines, so at the moment, they only have 1 core each.
Your help has saved me hundreds of hours of internet surfing.
Sounds good - keep us posted
Bad news - HDparm results today:
Timing cached reads: 1394 MB in 2.00 seconds = 695.98 MB/sec
Timing buffered disk reads: 8 MB in 3.81 seconds = 2.10 MB/sec
After restarting the host, it appears the drive speeds have now returned to normal. Many thanksk
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