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тАО10-17-2002 06:07 AM
тАО10-17-2002 06:07 AM
I am thinking about trying to squeeze in a mirrored logical volume extension during some non-peak production time.
I will be adding another 18GB Jamaica physical disk volume to an existing mirrored logical volume.
Does anyone roughly know if this process is a 5-minute process, 45-minute process or somewhere in between? I don't want to impact user 'too' long and maybe should be do this on non-production time.
Thanks,
Dewy
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тАО10-17-2002 06:09 AM
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тАО10-17-2002 06:10 AM
тАО10-17-2002 06:10 AM
Re: How much time to extend mirror volumes?
If you have OnlineJFS it should be pretty quick and easy, and you can do it while everything is up. You mention that you are adding one PV to an existing VG where the LV is mirrored. Will you be extending the current LV to the new PV and mirroring it to an existing PV? Just curious. It seems if you are doing mirroring you'd want to add two new PVs.
JP
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тАО10-17-2002 06:13 AM
тАО10-17-2002 06:13 AM
Re: How much time to extend mirror volumes?
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тАО10-17-2002 06:14 AM
тАО10-17-2002 06:14 AM
Re: How much time to extend mirror volumes?
Judging by the size of you disks, I would chance to say, not long. It isn't the disk, perse, that is being mirrored, however, it is the lvols. With that being said, I have mirrored my 36Bb internals for vg00 and it didn't take long (about 30 mins) for about 19-2GB of filesystem space. I guess your only other issue is how hard are those disks hit in relation to I/O??? I usually do my mirroring during the day with little impact.
Hope this helps
Chris
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тАО10-17-2002 06:19 AM
тАО10-17-2002 06:19 AM
Re: How much time to extend mirror volumes?
- installing the disk
- ioscan and diskinfo to make sure it's ok
- pvcreate it
- lvextend it
- check it (vgdisplay, lvdisplay, etc, etc)
then this should probably take about 30minutes, depending on how fast you can install the disk and how fast the system boots up. If I misunderstood your question, I'm sorry.
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тАО10-17-2002 06:24 AM
тАО10-17-2002 06:24 AM
Re: How much time to extend mirror volumes?
Chris
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тАО10-17-2002 06:34 AM
тАО10-17-2002 06:34 AM
Re: How much time to extend mirror volumes?
To further clarify our intentions, we are actually adding two (a pair) of 18GB disks for extending mirrored logical volumes. One will be the primary and the other the mirror.
The reason I mention 'down time' is that this system is an ORACLE server and since we do not have JFS-online, we have had to have Oracle down to free-up the filesystem on these logical volumes.
Thanks again,
Dewy
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тАО10-17-2002 06:39 AM
тАО10-17-2002 06:39 AM
Re: How much time to extend mirror volumes?
You can do the "preparatory work" up front.
Add the disks, pvcreate, vgextend and lvextend.
Then, when you get the chance to bring the db down, unmount and do you extendfs on them ( you can write a small script ahead of time).
And then, again, you can do the mirroring during the day as I stated, depending on your possible I/O issues.
Chris
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тАО10-17-2002 06:41 AM
тАО10-17-2002 06:41 AM