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You are here: Home / Uncategorized / vSphere Tips and Tricks Part 1

vSphere Tips and Tricks Part 1

05.30.2010 by William Lam // 3 Comments

Disclaimer: Ensure these changes have been thoroughly tested and confirmed with VMware support prior to rolling out into production. Most of these changes and tips may be undocumented by VMware, test at your own risk!

Map Service Console/COS VMDK to specific ESX host (useful if you boot from SAN):

grep -i "hostname" /vmfs/volumes/[datastore]/[esxconsole-datastore-uuid]/logs/sysboot-vmkernel-late.log
[root@everest ~]# grep -i "hostname" /vmfs/volumes/everest-local-storage/esxconsole-49a095a4-204d-c7ba-9bb8-001f29c7b048/logs/sysboot-vmkernel-late.log
0:00:00:06.289 cpu1:4105)Config: 363: "HostName" = "everest.primp-industries.com", Old value: "localhost" (Status: 0x0)

Retrieve VmId from vmware-cmd similiar to that in vimsh/vmware-vim-cmd (only available on classic ESX, not sure why it's not in vCLI):

vmware-cmd /vmfs/volumes/[datastore]/[path_to_vm]/vm.vmx getid
[root@everest ~]# vmware-cmd /vmfs/volumes/d32c5a97-e039bdbf/vCenter-ESX4.02172009/vCenter-ESX4.02172009.vmx getid
getid() = 32

VMware FT statistics and debugging utility
Available after some patch set, generally 4.0u1+

[root@esx-5 ~]# ft-stats
Usage: ft-stats [-hvf] [-c ] [-l] [-n ] [-d ] [-s ] [-w ]
-h, --help Show this message
-v, --verbose verbose output
-f, --force Continue even if version check fails
-c, --cache Use VSI cache file
-l, --list list FT VMs
-n, --iterations Print stats for n iterations
-d, --delay Print stats every n secs (default:5)
-s, --snapshot Collect stats for n secs
-w, --world Print stats for worldID

Note: This tool is intended to assist in troubleshooting and should only be used
with direction by VMware support. All other use of this tool is unsupported.

esxupdate - Query for installed/retired packages with undocumented "--vib-view" option

esxupdate --vib-view query
[root@himalaya ~]# esxupdate --vib-view query
--------------------------------------VIB ID------------------------------------- Package State -----------Timestamp------------
rpm_vmware-esx-drivers-scsi-fnic_400.1.1.0.109.2vmw-2vmw.1.9.208167@x86_64 installed 2010-01-06T12:24:38.100201-05:00
rpm_acpid_1.0.4-9.el5_4.2@x86_64 installed 2010-04-02T17:09:44.566014+00:00
rpm_samba-client_3.0.33-3.15.el5_4.1@x86_64 installed 2010-04-02T17:09:44.171847+00:00
rpm_nss_3.12.3.99.3-1.2157.vmw@x86_64 installed 2010-04-02T17:09:41.148547+00:00
rpm_initscripts_8.45.19.EL-1.2442.vmw@x86_64 installed 2010-04-02T17:09:36.911452+00:00

Change default COW (copy on write) disk growth value
Query (Default is 16MB):

[root@himalaya ~]# esxcfg-advcfg -g /COW/COWDiskSizeIncrement
Value of COWDiskSizeIncrement is 32768

Set (e.g. 256MB):

[root@himalaya ~]# esxcfg-advcfg -s 524288 /COW/COWDiskSizeIncrement
Value of COWDiskSizeIncrement is 524288

The input value for changing COWDiskSizeIncrement is in sectors

UNIT SECTORS COW GROWTH SIZE
32768 16MB
65536 32MB
131072 64MB
262144 128MB
524288 256MB
2097152 1024MB
.... ....

Easy formula is (SIZE_IN_MB)*(1024)*(2) = SECTOR VALUE

More from my site

  • Nested Virtualization Resources
  • How to Create Custom Roles on Standalone ESX(i) Host
  • esxcli Part3 - Automating esxcli using PowerShell
  • esxcli Part2 - Automating esxcli using vMA
  • esxcli Part1 - What is esxcli?

Categories // Uncategorized Tags // cos, cow, ESX 4.0, vimsh, vSphere

Comments

  1. *protectedNiTRo says

    06/13/2010 at 9:13 am

    William, is the COW value only stand for snapshot ?

    Reply
  2. *protectedWilliam says

    06/14/2010 at 11:53 pm

    @NiTRO,

    This applies to snapshots and thinly provisioned disks, basically any "sparse" disks will be using the default COW value of 16MB as I understand it.

    Here are more details regarding COW disks - http://kb.vmware.com/Platform/Publishing/attachments/1001175_fLinked%20Clone%20Managment.htm

    Reply
  3. *protectedAnonymous says

    10/02/2010 at 5:43 am

    How to use ft-stats ?
    Log = Stats not available, FT probably not active
    GL

    Reply

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William is Distinguished Platform Engineering Architect in the VMware Cloud Foundation (VCF) Division at Broadcom. His primary focus is helping customers and partners build, run and operate a modern Private Cloud using the VMware Cloud Foundation (VCF) platform.

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