| Author |
Message
|
| dotaneli |
 Posted: Thu Jan 29, 2009 2:29 am Post subject: MQ 6 on Windows - images on production |
 |
|
Voyager
Joined: 19 Oct 2005
Posts: 99
Location: Israel
|
Hello everyone,
One of our clients needs to install a new prod env.
One of our recommendations was to seperate the active logs to another physical disk.
As it turns out - the requirement is for 100% uptime for the prod env,
and for each physical disk there is a mirror - another physical disk.
The req. is to extract the mirror disks while the system is still running and put them aside, and insert new empty disks to continue mirroring.
My question is - without shutting down the system, what would happen to MQ, logwise? would it be possible to "plug in" the 2 mirrors and recover incase of a disaster (assuming the client approved 1-week rollback...).
Will mq logs be currpoted because of that nano-second difference between the extraction of one disk and then the other?
thanks. |
|
| Back to top |
|
 |
| Vitor |
| Posted: Thu Jan 29, 2009 3:09 am Post subject: Re: MQ 6 on Windows - images on production |
|
|
Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
|
| dotaneli wrote: |
| As it turns out - the requirement is for 100% uptime for the prod env, |
Oft quoted, seldom achieved. Most people settle for 99.5%. 
| dotaneli wrote: |
Will mq logs be currpoted because of that nano-second difference between the extraction of one disk and then the other?
|
That hinges entirely on what is doing the mirroring, and if the queue manager can maintain uninterupted access to what it sees as a single device.
_________________
Honesty is the best policy.
Insanity is the best defence. |
|
| Back to top |
|
|
| fjb_saper |
| Posted: Thu Jan 29, 2009 3:50 am Post subject: |
|
|
Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
|
As well and you did not specify you would really need 3 "data" file systems.
1) var/mqm for your data (queues etc + system)
2) /something/logs for your qmgr logs (preferably linear logs)
3) /something/archive for archiving your linear logs
Remember to take backups at any scheduled downtime and at least a backup of /var/mqm/mqsi.ini after creating / deleting /changing default attributes of a qmgr.
This way if any single FS blows up you're not completely out of the water.
However if 2 systems blow up you may be SOL (/var/mqm + /something/logs)... But then the probability of this occurring with mirrored disks and separate file systems and devices is quite low... but not impossible 
Have fun 
_________________
MQ & Broker admin |
|
| Back to top |
|
|
| dotaneli |
| Posted: Thu Feb 05, 2009 3:57 am Post subject: |
|
|
Voyager
Joined: 19 Oct 2005
Posts: 99
Location: Israel
|
thanks alot..
the problem is that my client uses Windows... (how sad..)
if it was unix, i would have managed.
So - when no schedueled downtime is allowed - how do i overcome this obsticle? |
|
| Back to top |
|
|
| Vitor |
| Posted: Thu Feb 05, 2009 4:03 am Post subject: |
|
|
Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
|
| dotaneli wrote: |
| So - when no schedueled downtime is allowed - how do i overcome this obsticle? |
1) Pull the breakers and do it as part of an unscheduled outage
2) Point out 100% uptime is unrealistic
3) Go for it and see how well Windows handles the mirror discs being hot swaped
I'd go with 2) and revert to 1) if the client proves intransigent.
If you do go with 3) do let us know how that works out for you.  
_________________
Honesty is the best policy.
Insanity is the best defence. |
|
| Back to top |
|
|
| exerk |
| Posted: Thu Feb 05, 2009 4:05 am Post subject: |
|
|
Jedi Council
Joined: 02 Nov 2006
Posts: 6339
|
If it's a Windows box it aint ever going to be up 100% 
Surely swapping the disks is going to have a performance impact on the system? What about shadow copying the mirror?
_________________
It's puzzling, I don't think I've ever seen anything quite like this before...and it's hard to soar like an eagle when you're surrounded by turkeys. |
|
| Back to top |
|
|
| fjb_saper |
| Posted: Thu Feb 05, 2009 4:05 am Post subject: |
|
|
Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
|
| dotaneli wrote: |
thanks alot..
the problem is that my client uses Windows... (how sad..)
if it was unix, i would have managed.
So - when no schedueled downtime is allowed - how do i overcome this obstacle? |
Mirrors on 3 different drives?
And kindly remind your client that MQ does not support recovery to point in time out of the box. (Cressida might help you with that). The default recovery is to the point of failure... and yes it makes quite a difference...
Enjoy
_________________
MQ & Broker admin |
|
| Back to top |
|
|
|
|
