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тАО10-05-2001 04:44 AM
тАО10-05-2001 04:44 AM
One guy says his instructor in class said there shouldn't be more than 4 or 5 disks in a volume group or you will suffer performance issues. When I called HP, the CE said the amount of disks in the volume group does not impact its performance and you can have as many as you want.
Does anyone else have an opinion on this?
TIA
FD
Solved! Go to Solution.
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тАО10-05-2001 05:02 AM
тАО10-05-2001 05:02 AM
SolutionIve never ever heard of anyone staiting before that over 4/5 disks in a VG slows down performance ! Im astounded someone would make a claim which in my opinion is not proveable. In fact the more disks in a VG - so that you can stripe lvols across them - increases IO performance, not decreases it !
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тАО10-05-2001 05:04 AM
тАО10-05-2001 05:04 AM
Re: LVM Performance vs. # of disks
The better you can spread your data over multiple physical disks, the better your performance.
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тАО10-05-2001 05:05 AM
тАО10-05-2001 05:05 AM
Re: LVM Performance vs. # of disks
I have to side with HP on this one. Creating too many volume groups and too many logical volumes is a management nightmare and should be avoided.
Was it an EMC instructor that said that VG's should only have 4 or 5 disks in it?
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тАО10-05-2001 05:11 AM
тАО10-05-2001 05:11 AM
Re: LVM Performance vs. # of disks
Imagine this: You have a database or some other data-pig that is one terabyte. You have an array of 18gb disks. Using the 4 or 5 disks per VG would force you to create 12 VG's. Was the instructor having a bad acid day?
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тАО10-05-2001 05:20 AM
тАО10-05-2001 05:20 AM
Re: LVM Performance vs. # of disks
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тАО10-05-2001 05:23 AM
тАО10-05-2001 05:23 AM
Re: LVM Performance vs. # of disks
maybe there was some confusion: more than 4-5 disks in one SCSI-chain might decrease performance because the SCSI-chain might be overloaded.
regards,
Thierry.
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тАО10-05-2001 05:25 AM
тАО10-05-2001 05:25 AM
Re: LVM Performance vs. # of disks
I also have HP-EMC and HP-XP env. and many
vg with various number of disks in volume groups. I havent seen # of disks per vg influence on performance. Most importen thing is on storage side. You must take disks from
diffrent controler units (XP), disk directors (EMC) to have better perfomance, and use more
then on FC adapter on host side.
:-)
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тАО10-05-2001 05:26 AM
тАО10-05-2001 05:26 AM
Re: LVM Performance vs. # of disks
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тАО10-05-2001 05:39 AM
тАО10-05-2001 05:39 AM
Re: LVM Performance vs. # of disks
After some more thought I came up with the same answer as Thierry has already replied - someone has mixed 4/5 disks per VG with the old performance constraint of 4/5 disks per controller (FWD SCSI type) !