How are you mapping the latency? On the filer stats show -i5 nfsv3 will give you good info, on the VM itself are you using iostat or ?
It does not make sense, aligning should never cause increased latency unless something else odd is going on.
Is it write or read latency that's increased (or both)? Do you have atime updates disabled on your volume options (which can cause "other_ops" to increase, although it shouldn't change the latency).
*Jeremy Page* | Gilbarco Veeder-Root, A Danaher Company Senior Technical Architect | IS Infrastructure Systems | Yahoo IM: jeremypage Office:336-547-5399 | Cell: 336-601-7274 | 24x7 Emergency: 336-430-8151
On 10/17/2012 09:49 AM, Steffen Knauf wrote:
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
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