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Old 08-21-2013, 10:16 PM   #1
karlochacon
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Performance Virtual Hard Drives Suse 11 SP1


hi guys

right now I have 6 Virtual Machines (VMs) running on Vmware ESXi 5.1 and attached to Storage SAN.
All these run Suse Linux 11 SP1 x64.

All of a sudden 1 of these VMs is running very slow making high CPU usage and I see al wait % kinda high 40-50%. Apparently since I don't own this virtual server the server was running fine and last change made was increasing memory

so I found out that test hard disk performance must be the issue
VM having issues. It so slow that I cancel the command but it's running at 2.7 MB

Code:
dd if=/dev/zero of=test bs=1048576 count=2048
781+0 records out
818937856 bytes (819 MB) copied, 298.699 s, 2.7 MB/s
running dd command on any of the other VMs linux server is about 280MB - 310 MB/s

Code:
dd if=/dev/zero of=test3 bs=1048576 count=2048
2048+0 records in
2048+0 records out
2147483648 bytes (2.1 GB) copied, 7.64361 s, 281 MB/s
any idea what could be causing this issue or how to fix it?

thanks a lot
 
Old 08-22-2013, 02:08 PM   #2
Mara
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Look into the kernel logs: dmesg. Does it show any errors?
 
Old 08-22-2013, 02:52 PM   #3
John VV
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besides the logs , have you thought about upgrading to SELS 11 sp3

running SELS11 sp1 is like running XP sp1 without installing the next two service packs sp2 and sp3
https://www.suse.com/promo/sle11sp3.html
 
Old 08-22-2013, 03:38 PM   #4
karlochacon
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Quote:
Originally Posted by John VV View Post
besides the logs , have you thought about upgrading to SELS 11 sp3

running SELS11 sp1 is like running XP sp1 without installing the next two service packs sp2 and sp3
https://www.suse.com/promo/sle11sp3.html
yes I get it just the other 5 system are running fine with SP1
 
Old 08-22-2013, 04:32 PM   #5
jefro
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Create a new system and test it? I can't imagine any virtual issue, just some issue that is unique to the data on this system.
 
Old 08-22-2013, 05:53 PM   #6
karlochacon
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Quote:
Originally Posted by jefro View Post
Create a new system and test it? I can't imagine any virtual issue, just some issue that is unique to the data on this system.
already did a new windows and suse VM no issues

yeah it's specific to this Suse Virtual Server since all other servers do not have any issues
 
Old 08-22-2013, 07:58 PM   #7
jefro
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If the hardware is exact across all of these then it almost can't be the hardware. If a test box is created and passes then we'd have to assume some issue with this single virtual instance. Either the configuration is wrong for the build or the data inside is wrong. Almost zero chance any real hardware is bad that could cause it. The only possible thing might be if you created an iscsi drive on the san on a single disk or such but you didn't say that.
 
Old 08-22-2013, 10:36 PM   #8
karlochacon
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Quote:
Originally Posted by jefro View Post
If the hardware is exact across all of these then it almost can't be the hardware. If a test box is created and passes then we'd have to assume some issue with this single virtual instance. Either the configuration is wrong for the build or the data inside is wrong. Almost zero chance any real hardware is bad that could cause it. The only possible thing might be if you created an iscsi drive on the san on a single disk or such but you didn't say that.

I did this test too:

I created a new virtual disk 12 GB size I added to the VM just to test if the 2 original virtual disk.
sda
sdb
were faulty or somthing

I created sdc format it using etx3, mount it as logical volume run dd test same issue.

So all disks even new ones get the same behavior
 
  


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