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11-27-2001 03:58 AM
11-27-2001 03:58 AM
I all,
Because I run easly into trouble when I use the default max_pe and pe_size, I change both to the max value each time a build a new VG.
So I can add a new disk (or lun) into my VG without the not enought PV for PE.
Someone can tell me if, by using the max value (max_pe = 65636 and pe_size=16MB), that will cause performance problem or waste resource ?!
Otherwise why this limitation exist and that maybe a very good reason to move on VxVM.
Because I run easly into trouble when I use the default max_pe and pe_size, I change both to the max value each time a build a new VG.
So I can add a new disk (or lun) into my VG without the not enought PV for PE.
Someone can tell me if, by using the max value (max_pe = 65636 and pe_size=16MB), that will cause performance problem or waste resource ?!
Otherwise why this limitation exist and that maybe a very good reason to move on VxVM.
Solved! Go to Solution.
3 REPLIES 3
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11-27-2001 04:09 AM
11-27-2001 04:09 AM
Re: vgcreate option
These figures are really governing the amount of space reserved on the disk for the VGRA. A larger number of max_pe per pv means more space on the disk reserved for a lookup table which points to all those PEs.
So the VGRA of a disk with a max_pe size of the value you are suggesting is going to take up a lot more space than a VG with smaller max_pe size.
Of course, we are still talking about KBs rather than GBs, so in a world of 72GB disks, it's not really worth worring about.
HTH
Duncan
I am an HPE Employee
So the VGRA of a disk with a max_pe size of the value you are suggesting is going to take up a lot more space than a VG with smaller max_pe size.
Of course, we are still talking about KBs rather than GBs, so in a world of 72GB disks, it's not really worth worring about.
HTH
Duncan
I am an HPE Employee

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11-27-2001 04:34 AM
11-27-2001 04:34 AM
Re: vgcreate option
Thera some threads regarding PE Size and MAX PEs.
The correct way seem to increase PE Size to 8 MB.
I noticed last day ( nigth) that default installation from HP in 36 GB disks is using this value yet.
The correct way seem to increase PE Size to 8 MB.
I noticed last day ( nigth) that default installation from HP in 36 GB disks is using this value yet.
unsupported
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11-27-2001 05:11 AM
11-27-2001 05:11 AM
Solution
Hi,
Here is a doc which explains it in detail:
http://us-support.external.hp.com/cki/bin/doc.pl/sid=1a325ef617d6081e9f/screen=ckiDisplayDocument?docId=200000052474625
The key thing to remember is , every disk belonging to the VG, needs to have a VG header map which contains the details of addressing every Physical extent in the VG. This header will be the size of a PE extent of the VG. So, if the PE extent is large (say 16MB), it can address more VG space and the VG can have a larger disk. If you are increasing the maximum number of PE's of a VG, it would automatically increase the size of the PE extent, since the Header map needs to be larger to address that much size.
Regarding performance issues, no- there is no performance issue at play here, unless you are not using Distributed extent striping. If you are using Distributed striping, then you would prefer to have a lesser PE extent size.
HTH
raj
Here is a doc which explains it in detail:
http://us-support.external.hp.com/cki/bin/doc.pl/sid=1a325ef617d6081e9f/screen=ckiDisplayDocument?docId=200000052474625
The key thing to remember is , every disk belonging to the VG, needs to have a VG header map which contains the details of addressing every Physical extent in the VG. This header will be the size of a PE extent of the VG. So, if the PE extent is large (say 16MB), it can address more VG space and the VG can have a larger disk. If you are increasing the maximum number of PE's of a VG, it would automatically increase the size of the PE extent, since the Header map needs to be larger to address that much size.
Regarding performance issues, no- there is no performance issue at play here, unless you are not using Distributed extent striping. If you are using Distributed striping, then you would prefer to have a lesser PE extent size.
HTH
raj
Take it easy.
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