Wednesday, September 10, 2008
Monday, August 18, 2008
Cannot re-create cluster disk resource
A cluster in User Acceptance Testing was required to test Windows 2003 Service Pack 2 and driver updates. For one reason or another some of the disk resources had been deleted but were required.
When attempting to recreate the disk resources, at the end of the New Resource wizard, Disk parameters, the Disk drop down dialog was not populated. Therefore the resource could not be recreated.
This drop down dialog is populated from :
HKLM\System\CurrentControlSet\ClusDisk\Parameters\Signatures\AvailableDisks
In this case, the disk was still listed under the "signatures" key.
To confirm the disk signature :
1. Locate the disk number from Device Manager. Properties of the disk, volume tab, populate.
2. Use diskpart :
Diskpart
Select disk
Detail disk
The resource can then be manually added from the command line using cluster.exe :
e.g. disk signature 0xA00AB325 and assigned letter K:
cluster . res "Disk F:" /create /group:"Disk Group" /type:"physical disk"
cluster . res "Disk F:" /priv signature=0xA00AB325
The disk could then be brought on line successfully.
When attempting to recreate the disk resources, at the end of the New Resource wizard, Disk parameters, the Disk drop down dialog was not populated. Therefore the resource could not be recreated.
This drop down dialog is populated from :
HKLM\System\CurrentControlSet\ClusDisk\Parameters\Signatures\AvailableDisks
In this case, the disk was still listed under the "signatures" key.
To confirm the disk signature :
1. Locate the disk number from Device Manager. Properties of the disk, volume tab, populate.
2. Use diskpart :
Diskpart
Select disk
Detail disk
The resource can then be manually added from the command line using cluster.exe :
e.g. disk signature 0xA00AB325 and assigned letter K:
cluster . res "Disk F:" /create /group:"Disk Group" /type:"physical disk"
cluster . res "Disk F:" /priv signature=0xA00AB325
The disk could then be brought on line successfully.
Sunday, August 10, 2008
The DHCP Bad Address Saga.
For some time now we've been working on an issue that resulted in "Bad Address" being reported in the DHCP console.
The client was getting an address successfully but this lease did not get registered in the database and hence not in the MMC. When the next client came along it was assigned an address already in use. Conflict detection was enabled and hence BAD_ADDRESS was recorded.
When the Bad Address is noted. The column that should contain the MAC address contains something different. This is the IP Address in hex and reversed. Example :
After lots of troubleshooting it was found that there two machines that had something wrong with their cable. Since removing these two cables from the sub net, the issue has gone away.
With hindsight, we could have got an idea that the issue was a rogue machine earlier. The network covered 3 class C subnets. If we'd split them, we'd have seen the issue was one just one of them. This was one of those suspicions that crossed our mind but didn't follow up.
The client was getting an address successfully but this lease did not get registered in the database and hence not in the MMC. When the next client came along it was assigned an address already in use. Conflict detection was enabled and hence BAD_ADDRESS was recorded.
When the Bad Address is noted. The column that should contain the MAC address contains something different. This is the IP Address in hex and reversed. Example :
After lots of troubleshooting it was found that there two machines that had something wrong with their cable. Since removing these two cables from the sub net, the issue has gone away.
With hindsight, we could have got an idea that the issue was a rogue machine earlier. The network covered 3 class C subnets. If we'd split them, we'd have seen the issue was one just one of them. This was one of those suspicions that crossed our mind but didn't follow up.
Tuesday, June 24, 2008
Duffy
...not the one from Casulty but the other one. Can I just say how much I'm enjoying Rockferry: http://www.amazon.co.uk/Rockferry-Duffy/dp/B0012OVF2U/ref=sr_1_1?ie=UTF8&s=music&qid=1214342900&sr=8-1
DWL-G520 hangs Windows 2008 on startup
So my home grown Windows 2008 machine is fast and cheap but not exactly on the HCL! The DLink Wireless DWL-G520 adapter appears as a "Atheros Wireless Network Adapter".
It works fine apart from one anoying feature - it prevents the machine from starting! With it disabled, it comes up OK, and can then be started OK - just need to disable it every time before shutting down.
Any one else getting this?
It works fine apart from one anoying feature - it prevents the machine from starting! With it disabled, it comes up OK, and can then be started OK - just need to disable it every time before shutting down.
Any one else getting this?
Update to Virtual Server 2005 R2 SP1 for Vista
Still in the process of getting my new Vista SP machine right...I was having issues (could not install additions, could not shut down the guest, Virtual Server serivce could not be managed) when running an XP SP3 guest on the Vista SP1 host.
The following update made things much better :
Update for Virtual Server 2005 R2 SP1 Available
This update qualifies support for the following additional Guest and Host Operating Systems: Windows Vista SP1 (Business, Enterprise, Ultimate), Windows XP SP3, Windows Server 2008 (Standard, Enterprise, Datacenter, Web).
The following update made things much better :
Update for Virtual Server 2005 R2 SP1 Available
This update qualifies support for the following additional Guest and Host Operating Systems: Windows Vista SP1 (Business, Enterprise, Ultimate), Windows XP SP3, Windows Server 2008 (Standard, Enterprise, Datacenter, Web).
Generate a memory dump using a keyboard without the right Ctrl key
We quite often make use of the CrashOnCtrlScroll feature :
http://support.microsoft.com/?id=244139 Windows feature lets you generate a memory dump file by using the keyboard
However, many of the keyboards in our racks do not have a righthand Ctrl key. Previously we had to plug in a full sized keyboard but functionality has been added to allow the keys to be modified. I was slightly confused by the article, so to save anyone else any time head scratching :
To configurethe Left CTRL and SPACE BAR you would set :
Dump1Keys = 0x20 (hex)
Dump2Key = 0x3D (hex)
Or to use CTRL and D :
Dump1Keys = 0x20 (hex)
Dump2Key= 0x21 (hex)
The value for Dump1Keys being : CRASH_R_SHIFT 0x01 CRASH_R_CTRL 0x02 CRASH_R_ALT 0x04 CRASH_L_SHIFT 0x10 CRASH_L_CTRL 0x20 CRASH_L_ALT 0x40 and Dump2Key being one of the following but converted to hex:
Day 1
My first post on blogger.com!
So I've tried My Space, Facebook, Livespaces, the overhead of doing my own site was too much, so here I am. Let's see how things progress...
You may know me as Ali or Alastair, or you may not know me, hopefully you'll find something here interestering or funny. Let me know if you do!
So I've tried My Space, Facebook, Livespaces, the overhead of doing my own site was too much, so here I am. Let's see how things progress...
You may know me as Ali or Alastair, or you may not know me, hopefully you'll find something here interestering or funny. Let me know if you do!
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