So, I need to move an external disk enclosure from an AIX 4 machine to the AIX 5 replacement. The disks work perfectly on the old system. So I umount, varyoff, exportvg, powerdown. Move it over, powerup, lspv shows the hdisks...but importvg does not work. lquerypv works (returns data) for some of the disks, but not all. It seems that deconfiguring and reconfiguring the disks seems to result in different disks responding and not responding to lquerypv. The internal disks work fine on that machine.
And when we bring it back down and move the enclosure back onto the old system, everything works fine. Using the same cable, and on the new machine, we tried two different ports. The controller passes diagnostics...
These are simple, single CPU machines, not clusters or blades or LPARs or anything.
So, any ideas?
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7 replies Latest Post - 2012-10-08T13:56:02Z by KellyClowers
Pinned topic AIX 5 disk visibility/config issue
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Updated on 2012-10-08T13:56:02Z at 2012-10-08T13:56:02Z by KellyClowers
ColombianJoker 110000DMJR68 Posts
Re: AIX 5 disk visibility/config issue2012-09-24T22:04:10Z in response to ColombianJokerHm, please forgive me, I am still new to AIX and IBM hardware (tossed into the role, since I do know a fair bit of Linux on x86 and no one else does...); do you mean something like "lsmcode -A"?
On the new machine with that command I get:
sisscsia0!53495310.0710000B sisscsia1!44415254.0708000b cd0!IBM-DROM002054.P633 hdisk0!HUS1530.56425030.53324335 hdisk1!HUS1514.56505230.53343343 ent0!14108902.DV0210 ent1!14108902.DV0210
On the old machine (currently has the enclosure and disks attached and running), I only get this:
The relevant disks are currently called hdisk1, hdisk4 and hdisk5, attached to scsi1. I have no understanding of why other devices do not show for lsmcode -A on this machine.
SystemAdmin 110000D4XK6907 PostsACCEPTED ANSWER
Re: AIX 5 disk visibility/config issue2012-09-25T03:06:03Z in response to KellyClowersHi,
Does this external disks have a driver installed in the AIX 4? Have you command cfgmgr successful in AIX 5? How about your OS level in AIX 5. do you have the latest TL? Might be compatibility issues...
Re: AIX 5 disk visibility/config issue2012-09-25T03:52:07Z in response to SystemAdmin>Does this external disks have a driver installed in the AIX 4?
I would think was obviously yes, but since you ask, it makes me doubt a little. As far as I know there is a driver installed. I see them, I can mount and access data off of them. Based on normal experience (i.e. non-IBM), that would mean the driver is working.
>Have you command cfgmgr successful in AIX 5?
Similar to above. Yes, I have run cfgmgr without errors, and I see them with lspv, including IDs
>How about your OS level in AIX 5. do you have the latest TL? Might be compatibility issues...
5.3, TL 6 I think. Will update at work when I double check the TL.
Re: AIX 5 disk visibility/config issue2012-10-08T13:48:11Z in response to KellyClowersSo, disconnecting and connecting the enclosure, or reconfiguring, does cause different disks to become accessible or not. And when they are accessible with lquerypv et al, I can importvg from them, mount FSs and access data. But that unstableness is really odd. The same models of equipment are working fine up here with the same OS version. And the enclosure and all its disks work fine every time we have them on the old v4 machine.
I am really thinking it is a subtle and intermittent hardware issue with the scsi card. Unfortunately we don't have another one, we will have to buy one to test...
Re: AIX 5 disk visibility/config issue2012-10-08T13:56:02Z in response to KellyClowersOh, and when I use diag on one of the non-working hdisks, it gives a buss error:
721-108: A bus failure occurred.
hdisk2 FRU: 26K5153 Other SCSI Disk Drive
when the disk is working it is free of errors and certifies clean as well.