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| sunny_30 |
 Posted: Fri Jul 01, 2011 7:59 am Post subject: Why are MQ install files outside /usr/mqm |
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Master
Joined: 03 Oct 2005
Posts: 258
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HI All
I have a question on MQ install in AIX environment
When MQ server or client version is installed, some files or sym-links (mostly) are written outside the MQ assigned install filesystem: /usr/mqm into following directories on AIX:
| Code: |
/usr/lib
/usr/bin
/usr/opt
/usr/include
/usr/share
/bin
/var/mqm |
Installing into /var/mqm is fine but Is there a strong technical reason why MQ puts files into rest of above file-systems ?. I suspect there should be but not sure what that is.
Can somebody please explain why (or) if it is a bad design by MQ that could have been avoided?
Thanks |
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| Vitor |
| Posted: Fri Jul 01, 2011 8:23 am Post subject: Re: Why are MQ install files outside /usr/mqm |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| sunny_30 wrote: |
| Can somebody please explain why (or) if it is a bad design by MQ that could have been avoided? |
It's considered best practice to put software in it's own libraries (/usr/mqm) and symlink in the folders that are on most user's path (/usr/bin & /usr/lib). In this way the software is properly segrigated but the user's path doesn't contain dozens of folders.
Also IIRC back in the day the PATH could only be 255 characters long, so you couldn't put all the software folders in it without going over the limit.
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Honesty is the best policy.
Insanity is the best defence. |
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| sunny_30 |
| Posted: Fri Jul 01, 2011 10:31 am Post subject: |
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Master
Joined: 03 Oct 2005
Posts: 258
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You are right but I dont see that all files installed outside MQ are symlinks .. I see a bunch of non-symlinks for GSK ( I agree its separate from MQ.. )And also some files under /usr/lib/nls
Bottomline I would like to ask is .. for DR purposes if /usr/mqm & /var/mqm are replicated & any other files/ symlinks outside these file-systems are left out, PATH updated appropriately, NLSPATH also pointing to alternate location where above nls files are stored... would it be all fine then? Any other steps essential for MQ working ? Is this a supported approach by IBM ?
Please note we are not looking to have MQ SSL support
Any suggested alternative to store the GSK files also under /usr/mqm & using an env variable to invoke it, would be great & comprehensive |
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| bruce2359 |
| Posted: Fri Jul 01, 2011 10:55 am Post subject: |
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Poobah
Joined: 05 Jan 2008
Posts: 9470
Location: US: west coast, almost. Otherwise, enroute.
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Refer to (read) the Quick Beginnings manual for your platform o/s. You get to decide exactly where WMQ components get installed - if you don't like the defaults.
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| fjb_saper |
| Posted: Fri Jul 01, 2011 10:01 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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The only right way to clone an WMQ installation is to create a full clone of the box, including the users and groups defined.
Otherwise it's time to reinstall WMQ on the target box. You may get away with then cloning /var/mqm (data + logs), but only if the source has been stopped. (State consistency).
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| mvic |
| Posted: Sat Jul 02, 2011 2:51 am Post subject: |
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Jedi
Joined: 09 Mar 2004
Posts: 2080
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| bruce2359 wrote: |
| You get to decide exactly where WMQ components get installed - if you don't like the defaults. |
This is only true on Windows. |
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| sunny_30 |
| Posted: Wed Jul 06, 2011 6:31 am Post subject: |
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Master
Joined: 03 Oct 2005
Posts: 258
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| mvic wrote: |
| bruce2359 wrote: |
| You get to decide exactly where WMQ components get installed - if you don't like the defaults. |
This is only true on Windows. |
Exactly !
I dont find any options in AIX QuickBeginnings to alter default location for gsk install or any other default locations. Not even the mention of NLSPATH
| fjb_saper wrote: |
| The only right way to clone an WMQ installation is to create a full clone of the box |
Is this a bad design by MQ ?
For eg- In our environment, we have MQserver installs for which the plan is to maintain separate installs for them on their DR instances. But to apply same rule for MQclient systems (about 20 surround app systems like oracle, sap-ecc, sap-pi etc etc) has become a big pain. Unix admins complaning MQ is a badly written app (that sprays install files all over the system !!). If we compare- for eg- SAP like apps dont install any files outside /usr/sap & they have to define exceptions for Metro Mirroring MQclient file-systems alone on each of surround app-server systems....
Im trying to design MQclient DR instances in such a way to avoid separate MQclient installs. Dont mind altering PATHs, NLSPATHs, & as I said we dont plan to use MQ-SSL (gsk) feature
Can you advise if its a good approach ?
For us cloning whole system is not an option, Syncing rootvg filesystems are not an option.
| fjb_saper wrote: |
| You may get away with then cloning /var/mqm (data + logs), but only if the source has been stopped. (State consistency). |
Agree - Thanks for suggestion !
For now, I have no questions on data syncing part.
For us RPO=0 is must. So sync- replication (over a 300 km distance) is the only option even though we understand it degrades the performance on primary (a little bit  hopefully )
For this topic's discussion, Im strictly focussed on DR design for MQ client install files only, whether to keep them separate or not ? |
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| sunny_30 |
| Posted: Wed Jul 06, 2011 6:50 am Post subject: Re: Why are MQ install files outside /usr/mqm |
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Master
Joined: 03 Oct 2005
Posts: 258
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| Vitor wrote: |
| Also IIRC back in the day the PATH could only be 255 characters long, so you couldn't put all the software folders in it without going over the limit. |
But how much of it (installing MQ outside /usr/mqm) is still relevant in the current virtualization world ? |
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| Vitor |
| Posted: Wed Jul 06, 2011 7:29 am Post subject: Re: Why are MQ install files outside /usr/mqm |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| sunny_30 wrote: |
| Vitor wrote: |
| Also IIRC back in the day the PATH could only be 255 characters long, so you couldn't put all the software folders in it without going over the limit. |
But how much of it (installing MQ outside /usr/mqm) is still relevant in the current virtualization world ? |
If each virtual server looks (from a file system perspective) like a real server then it's still fully relevant.
If it doesn't (and I'm thinking of something like a Solaris Sparse Zone here) then it's still relevant in that the zones have rules about where \usr is and how the zone both sources it and references it. If you look at the DW stuff and IBM notes on Solaris Zones then you'll see that one of the things they discuss is the handling of \usr.
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