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тАО09-13-2005 08:39 AM
тАО09-13-2005 08:39 AM
HSG80 and EVA, Windows lun woes behind the scenes
Is a SCSI inquire capable of showing it? If so can someone share a stable exe or C code to compile to show this.
I want to know this so if I yank a lun I know I am pulling the right one for sure :), because if you have many the same size presented its tough to tell.
There has to be a way, or the OS could not do it. Perhaps a HP person could assist on this. Whats the magic?
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тАО09-13-2005 01:49 PM
тАО09-13-2005 01:49 PM
Re: HSG80 and EVA, Windows lun woes behind the scenes
Not sure if this totally helps, but right clicking on a Windows level disk and then looking at the "location" field specifies the controller WWN & the LUN combination for that disk.
My understanding is that these values are what Windows uses to perform persistent identification of Windows level mount points (as in drive letters) and HSG/EVA level Vdisks. I wish Linux had used the same logic - and then LUN persistence under Linux would not have been so much of an issue.
If this does not help and you are after something advanced such as SCU on Tru64 - guess what there is a SCU utility for Windows as well.
Let me know what you think or need more info on SCU and I can provide more info as needed.
Regards,
Saket.
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тАО09-13-2005 03:23 PM
тАО09-13-2005 03:23 PM
Re: HSG80 and EVA, Windows lun woes behind the scenes
I'm quite sure about this - You're using dynamic disks on windows aren't You?
(also, there is something in the registry hive HLKM for the pci\scsi miniport\id\lun collection, but this is dynamic data)
with regular disks and a SCSI or FC JBOD array, switching the disks in their slots will also affect the (DOS int80h,81h,...) drive letter mapping, while with dynamic disks stay as they are supposed to.
thus: use LVM2 :))
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тАО09-13-2005 04:08 PM
тАО09-13-2005 04:08 PM
Re: HSG80 and EVA, Windows lun woes behind the scenes
For example two 50 gig luns D1 and D2 on EMA that are the same size is Drive G and H say on windows. How do you know G is D1 or D2 LOL if someone just handed you the box in production with no documentation :). I have talked to windows admins who had their boxes die and go to windows heaven when the wrong lun completely goes away. This should not happen but it does from time to time. There has to be a way to figure this out without guessing.
EVEN ON HPUX for this reason the EVA is a real pain because of this :). Heaven forbid you run out of channels and have to redo em LOL with like sized luns.
Thanks for your replies looking forward to more info on how this stuff works on windows.
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тАО09-13-2005 04:11 PM
тАО09-13-2005 04:11 PM
Re: HSG80 and EVA, Windows lun woes behind the scenes
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тАО09-13-2005 04:41 PM
тАО09-13-2005 04:41 PM
Re: HSG80 and EVA, Windows lun woes behind the scenes
WELCOME TO THE WONDERS OF VIRTUALIZATION
(I just couldn't resist that)
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тАО09-14-2005 05:10 AM
тАО09-14-2005 05:10 AM
Re: HSG80 and EVA, Windows lun woes behind the scenes
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тАО09-14-2005 05:16 AM
тАО09-14-2005 05:16 AM
Re: HSG80 and EVA, Windows lun woes behind the scenes
Also it would be nice if someone could explain the field formatting on these devices data because every vendor and device is a bit different how it presents the data.