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05-13-2002 05:54 AM
05-13-2002 05:54 AM
Number of disks in volume group
Thanks for any assistance with this.
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05-13-2002 05:57 AM
05-13-2002 05:57 AM
Re: Number of disks in volume group
The default value is 16, but it can be set to a value between 1 and 255.
This can ONLY be set at VG creation time. There is no way to reset it after you create the VG.
See 'man vgcreate', specifically the '-p' option, for more information.
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05-13-2002 05:57 AM
05-13-2002 05:57 AM
Re: Number of disks in volume group
You can specify the maximum number of PVs when you create the volume group with vgcreate. The default is 16 PVs. The only way to increase it is to nuke the volume group and recreate it.
JP
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05-13-2002 05:58 AM
05-13-2002 05:58 AM
Re: Number of disks in volume group
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05-13-2002 06:00 AM
05-13-2002 06:00 AM
Re: Number of disks in volume group
hi
while creating a VG by default the max pv will be 16. U cannot increase the max pv in an existing VG. what u have to do is create a new VG with -p option
ie, vgcreate -p 'pv nos'
u can select a value between 1 to 255.
then u have to make filsystems and move ur data
CTK
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05-13-2002 06:00 AM
05-13-2002 06:00 AM
Re: Number of disks in volume group
Max phys volumes is set when the VG is created - default is 16. The absolute max is 255.
Unfortunately it cannot be changed w/o recreating the VG from the start.
So you'd have to back it up & recreate the VG - setting an appropriate max for your needs.
Rgds,
Jeff
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05-13-2002 06:00 AM
05-13-2002 06:00 AM
Re: Number of disks in volume group
Once the VG has been created it is a hard limit. The parameter for Maximum no of PV's in the vg has to be defined in the vgcreate command itself.
use the -p option to set the maximum no of PV's you may add to this VG at the time of vg creation.
Once set, this cannot be changed for that VG, the only choice is to create a new VG.
Hope this helps.
Regds
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05-13-2002 06:00 AM
05-13-2002 06:00 AM
Re: Number of disks in volume group
It is a "hard-and-fast-limit" *only* at creation time. That is, at 'vgcreate'. If you want to increase the value from its default, you must specify it ('-p max_pv') when the volume group is created. Once set, the only way to change it is to destroy and recreate the volume group.
Regards!
...JRF...
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05-13-2002 06:10 AM
05-13-2002 06:10 AM
Re: Number of disks in volume group
You are stuck with the Max PV number that was set during VG creation.
This option only can be changed during vg creation.
Thanks.
Prashant.
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05-14-2002 06:44 AM
05-14-2002 06:44 AM
Re: Number of disks in volume group
There is another option available to you, although I would just recreate the volume group. On the EMC frame you can use meta volumes. Combine several of those smaller LUNs into a larger one and present that to the host. However, if you accepted the maximun number of disks default value when you created the volume group, you probably also accepted the maximum number of physical extents per disk value which defaults to the largest disk you added when creating the volume group.
So even if you combined 2 of those 4GB LUNs into an 8GB LUN, your old volume group would only be able to use 4GB. You pretty much still have to recreate your volume group.
I just bring this up as an option if you want to limit the number of LUNs you present to the host. I had almost hit the limit of LUNs that I can have on an interface on my K570. This past weekend I reworked much of it by setting up LUSE volumes on my XP256 (essentially the same as meta volumes). I have the same amount of disk space available to me, but about half the number of LUNs. A little easier to manage from the host side.
On the XP I can setup LUSE volumes myself. When I last ran an EMC, 2.5 years ago, to do a meta volume would require EMC to rework the bin file, load it and reboot the frame. Of course your hosts would also be down. They also charged me for this type of work. I'm not sure of the state of EMC now. Whether this can be done without a frame reboot, how much the customer can do and if there is a charge if EMC has to do it. You might want to investigate it just for the knowledge. Also, read the man page for vgcreate. It will clear up many things for you.