Hi,

a small update. After aligning some VM's, a couple of them are slower (disk latency is higher than 200ms). The NFS Storage, where the *.vmdk's are stored has a different lateny than the disk. Strange........

./mbralign --sparse /vmfs/volumes/chip4-vmware_data_nfs01/web02/web02-flat.vmdk

Part    Type          old LBA    New Start LBA      New End LBA     Length in KB

   P1      83               63               64           401626           200781

   P2      82           401625           401640          4482150          2040255

   P3      83          4482135          4482160        314568790        155043315

Any Ideas?

greets

Steffen

Von: Jeremy Page [mailto:jeremy.page@gilbarco.com]
Gesendet: Freitag, 28. September 2012 17:11
An: Steffen Knauf
Cc: 'Jeff Mohler'; toasters@teaparty.net
Betreff: Re: AW: AW: Raidgroupsize and I/O Performance

Aligning your VMDK files is the first thing I'd do for certain.  As was mentioned on other messages you should verify that the PAM cards will help so you can evaluate cost/benefit. For us they worked wonders but if you are write constrained then all the cache in the world is not going to help.

On 09/28/2012 11:05 AM, Steffen Knauf wrote:

Yes that's true. A strange thing is that VSC (4.0) and mbrscan show me different results:

/opt/ontap # ./mbrscan /vmfs/volumes/chip4-vmware_data_nfs01/openx-test01/openx-test01-flat.vmdk

mbrtools esxi version 1.0

--------------------

/vmfs/volumes/chip4-vmware_data_nfs01/openx-test01/openx-test01-flat.vmdk p1 (Linux)    lba:64  offset:32768    aligned:Yes

/vmfs/volumes/chip4-vmware_data_nfs01/openx-test01/openx-test01-flat.vmdk p2 (swap)     lba:401640      offset:205639680        aligned:Yes

/vmfs/volumes/chip4-vmware_data_nfs01/openx-test01/openx-test01-flat.vmdk p3 (Linux)    lba:16771888    offset:8587206656       aligned:Yes

I think i can delete the backup file?:

[Counter=2891433], Filename=vol_vm1/openx-test01/openx-test01-flat.vmdk-mbralign-backup

I rescan the datastores via VSC and get the result that openx-test01 is misaligned

And some mbrscans are not possible:

./mbrscan /vmfs/volumes/chip4-vmware_data_nfs01/openx-test03/openx-test03-flat.vmdk

Failed to open /vmfs/volumes/chip4-vmware_data_nfs01/openx-test03/openx-test03-flat.vmdk - [Device or resource busy]

Thanks for your help and have a nice weekend. I'm on holiday for 1 Week, so my response could be delayed.....

greets

Steffen