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тАО03-01-2006 08:43 PM
тАО03-01-2006 08:43 PM
several logical volumes/several volume groups
In HP-UX 11i, with oracle using different mount point, is better to create one VG with several logical volumes? Or create several volume groups with one or logical volume?
So in witch configuration HP-UX work fine and what is the impact for the performance???
Best regards
Omar
s
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тАО03-01-2006 08:47 PM
тАО03-01-2006 08:47 PM
Re: several logical volumes/several volume groups
if you thinking about the suggestion to have different parts of the oracle database in different locations, it is the physical location that impacts.
The I/O to the disk is the potential bottleneck.
So split your DB across different disks/controllers, rather than different mountpoints on the same physical disk.
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тАО03-01-2006 08:47 PM
тАО03-01-2006 08:47 PM
Re: several logical volumes/several volume groups
Also there is a parameter in kernel MAX VG, after a while you will run out and need to increase this parameter if you choose to have more VG
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тАО03-01-2006 08:53 PM
тАО03-01-2006 08:53 PM
Re: several logical volumes/several volume groups
In a LVM enviornment it is always better to have less VGs and corresponding filesystems in that VGs ( i.e. LVs) this is reduce the complexity of the file systems and even the I/O operation among the file systems.
Regards,
Abhijit
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тАО03-01-2006 08:57 PM
тАО03-01-2006 08:57 PM
Re: several logical volumes/several volume groups
There should not be any impact on performance because of no. of VGs in system or no. of LVOLs in each VG. Moreover a better impact will be due to the layout of the file systems i.e. stripping , mirroring etc.
I would suggest to have more than one VG to differentiate the type of LVOLs. One for redologs, one for data files and one other for other data.
HTH,
Devender
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тАО03-01-2006 09:09 PM
тАО03-01-2006 09:09 PM
Re: several logical volumes/several volume groups
Each VG can have different set of disks, more or less performant and help you administer and have a glance with a bdf :)
This VG separation also considering Service Guard packages switches: packages bring with them entires VGs, so their LV: you have to setup different sets of VG for each instance you want to be able to run separately.
Regards.
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тАО03-02-2006 01:56 AM
тАО03-02-2006 01:56 AM
Re: several logical volumes/several volume groups
I have 1 volume per vg to keep my flexibiltiy and I have hundreds of volumes. yess tha admin sucks but just doing what they ask for when it makes sense from previous foo bars.
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тАО03-03-2006 12:20 AM
тАО03-03-2006 12:20 AM
Re: several logical volumes/several volume groups
Whether one uses seperate VGs or 1 VG is a matter of preference. An additional performance tuning item to consider is mount options, e.g, direct i/o or fs cache. You should look at the type of disks whether, e.g. MSA drives compared to symm, and if your multipathing.