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тАО11-28-2007 04:39 AM
тАО11-28-2007 04:39 AM
VG LUN Issue -Max 16 devices- can't extend VG
2.4.21-32.ELhugemem
Red Hat Enterprise Linux AS release 3 (Taroon Update 5)
LVM version is lvm-1.0.8-14
Both systems have more then 16 LUN's presented from an EMC CX700 array. I created one VG and added 5 LUN's and then created another VG to use the rest. I have this error when I try to extend the VG past the 16th LUN.
vgextend vgeixpr01 /dev/emcpowerq1
vgextend -- INFO: maximum logical volume size is 2 Terabyte
vgextend -- ERROR: no physical volumes usable to extend volume group
I am using the emcpowerXX devices. Max LUN's is set for 256
options scsi_mod max_scsi_luns=256
Anyone have any ideas why this is happening. These are not in a cluster and have seperate LUN's but both more than 16. Thanks in advance
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тАО11-28-2007 06:08 AM
тАО11-28-2007 06:08 AM
Re: VG LUN Issue -Max 16 devices- can't extend VG
The message seems to indicate that this is not a number of LUNS issue.
maximum logical volume size is 2 Terabyte
Size matters to distort a phrase.
fdisk -l, make sure you are using the correct disk in your vgextend command.
Also, if you are limited to 16 LUNS that could be because the vgcreate command was run with the -p 16 command.
As far as I know the vg will need to be created anew to get around this issue.
SEP
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тАО11-28-2007 07:04 AM
тАО11-28-2007 07:04 AM
Re: VG LUN Issue -Max 16 devices- can't extend VG
Vgcreate was used but not with -p 16 option
This occurs on two servers so I know it is the correct device. Same device /dev/emcpowerq on both systems fail.
fdisk -l shows valid information
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тАО11-28-2007 09:03 AM
тАО11-28-2007 09:03 AM
Re: VG LUN Issue -Max 16 devices- can't extend VG
In HP-UX if not specified the -p is set to 16. Not sure on linux.
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тАО11-28-2007 09:59 AM
тАО11-28-2007 09:59 AM
Re: VG LUN Issue -Max 16 devices- can't extend VG
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тАО11-28-2007 11:54 AM
тАО11-28-2007 11:54 AM
Re: VG LUN Issue -Max 16 devices- can't extend VG
From memory, RHEL3 uses LVM1, thus is fairly limited based on the PE size in use.
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тАО11-29-2007 02:06 AM
тАО11-29-2007 02:06 AM
Re: VG LUN Issue -Max 16 devices- can't extend VG
1.LUN size of each disk used
2. vgdisplay -v