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тАО11-25-2002 08:32 AM
тАО11-25-2002 08:32 AM
Logical Volume & Volume Groups
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тАО11-25-2002 08:37 AM
тАО11-25-2002 08:37 AM
Re: Logical Volume & Volume Groups
I think you mean you have 3 Volume groups with 20 logical volumes spread between the volume groups for the first box.
For the second box I think you mean you have 9 volume groups with 20 logical logical volumes.
A logical volume can also be called a filesystem, when it's a mounted filesystem and not a raw logical volume that's used for some databases.
Usually I group Volume groups by "business units/process", and then create the necessary logical volumes (filesystems) under each as necessary.
live free or die
harry
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тАО11-25-2002 08:40 AM
тАО11-25-2002 08:40 AM
Re: Logical Volume & Volume Groups
Think you mean 3 VG's and 20 LV's.
I try to use following.
VG00 OS
VG01 aplication's
VG02 DATA
Kind regards,
Robert-Jan.
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тАО11-25-2002 08:40 AM
тАО11-25-2002 08:40 AM
Re: Logical Volume & Volume Groups
The usual answer - it depends, usually on your application. If you have an application like a big database, it might be happier having lots of logical volumes. We setup our Oracle databases that way, especially because it helps us with backups - more LVs mean more streams for OmniBack. On the other hand, some applications just want a large, single filesystem / logical volume.
Did you mean 3 volume groups and 20 logical volumes, and 9 volume groups and 20 logical volumes? Otherwise you would have volume groups without any logical volumes.
JP
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тАО11-25-2002 08:47 AM
тАО11-25-2002 08:47 AM
Re: Logical Volume & Volume Groups
It all depends on
1. Ease of setup
2. Ease of backups.
3. High I/O areas interms of I/o bcoz of database.
4. Future expansion.
genrally I would consider all the above in the order 3 4 1 2 also considereing not to have more than 3-4 Phyiscal volumes per volume group.
Manoj Srivastava
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тАО11-25-2002 08:47 AM
тАО11-25-2002 08:47 AM
Re: Logical Volume & Volume Groups
A couple of things come to mind when setting up volume groups and their associated logical volumes.
First, at present, it is not possible to alter LVM geometry like 'pe_size', 'max_pe', 'max_pv' and 'max_lv' *except* at volume group creation. Poor planning can mean that you will end up recreating your volume group and reloading your data in some way, shape or fashion.
Next, your kernel limits you to 'maxvgs' volume groups. By default this is <10> although it can be increased. Each volume group on your system requires about 4-8KB of lockable physical memory.
Regards!
...JRF...
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тАО11-25-2002 08:53 AM
тАО11-25-2002 08:53 AM
Re: Logical Volume & Volume Groups
It depends on:
The number of the number of disks.
The performance level.
The number of applications.
The security level you want to implement.
Normally few volume groups and several logical volumes per VG.
Regards, Vicente.
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тАО11-25-2002 09:02 AM
тАО11-25-2002 09:02 AM
Re: Logical Volume & Volume Groups
You'll make your life easier if you always reserve vg00 for the OS *only*. This makes upgrades, cold-installs, and Ignite recovery much simpler than working with a VG00 that contains logical volumes that are application-specific.
Regards!
...JRF...