No help, just amusing. The "dumb message of the day" award goes to fdisk
Code:
Command (m for help): t
Partition number (1-5): 5
Partition 5 does not exist yet!
Command (m for help): t
Partition number (1-5): 4
Hex code (type L to list codes): 8e
You cannot change a partition into an extended one or vice versa
Delete it first.
I'm not experiencing the problems you are with pvcreate. Can you remove the PV and rescan it and start from scratch? (unless, of course, someone has a better idea, or, of course, sdb1 is actually being used!).
... I tried creating an extended partition to see if that caused a problem, then got that silly 'error'. It's of no consequence to your issue, just amusing.
Regarding the pvcreate error: do you know if your lvm.conf has been manually modified? If you do any multipathing chances are that it has been (otherwise you'd constantly be getting duplicate PV errors in /var/log/messages). You may check /etc/lvm/lvm.conf and see if you have a filter set up.
I think I messed up by deleting the physical volumes.
I was getting errors
Code:
# vgscan -v
Wiping cache of LVM-capable devices
Wiping internal VG cache
Reading all physical volumes. This may take a while...
Finding all volume groups
Finding volume group "VolGroup00"
Couldn't find device with uuid 'UPkdKc-Ki6u-5GUf-BY8u-WABy-ssZ6-lkPjJl'.
Couldn't find device with uuid 'bJaD2H-hx8h-dmD5-AgAk-RvHD-utl0-Gc9ooK'.
Couldn't find device with uuid 'eh2fqQ-RjQZ-eLOc-jVnL-oSd3-j8o2-JBEQny'.
There are 3 physical volumes missing.
Found volume group "VolGroup00" using metadata type lvm2
So removed these devices using: vgreduce --removemissing
And doing a reconfigure.
Now if I need to start and have 2 Logical Volumes on /sdb
thats /dev/sdb1 and /dev/sdb2. What steps are needed.
Code:
fdisk /dev/sdb
pvcreate /dev/sdb1
pvcreate /dev/sdb2 --- not sure if we need this
vgextend VolGroup00 /dev/sdb1
vgextend VolGroup00 /dev/sdb2
lvcreate -L 60G -n LogVolU02 VolGroup00
lvcreate -l 100%FREE -n LogVolU01 VolGroup00
Would this be correct?
Last edited by Scott; 11-09-2012 at 12:30 PM..
Reason: Code tags, please...
But I still don't see the point of both partitioning with fdisk and then again with logical volumes. You'd be as well just using fdisk to specify ext3, or whichever FS type you want, then creating a filesystem without LVM, since it would be just as easy to create three primary fdisk partitions for your filesystems, or easier, actually, than creating two and then using LVM to carve it up further. And given that sdb1 and sdb2 are on the same physical disk - and I noticed that sdc seems to have been quietly dropped(!), you're not really gaining anything in terms of performance or reliability with the hybrid fdisk / LVM approach.
sdc I dropped as it is a different disk and will be an entirely used for sdc1.
I am not sure how to partition /sdb into 2
If it can be done without fdisk. Can you please guide as to what steps are needed. THe reason I have been using fdisk in beginning is I saw it online.
In the article, he is using fdisk to partition the disk to use partition type "8e" - Linux LVM.
If you allocate all space on sdb to a single primary partition (like you had before), you can then use LVM to create your volume group, and lvcreate to create the sizes of logical volumes you need.
I've never used fdisk to do this. Normally, just presenting the disk to the system and using LVM commands to create PV's, VG's and LV's is enough.
No need to fdisk. No need for fancy partitioning. I can now create my filesystems using these three LV's and I don't have to worry about it.
If, later on, I want to extend these filesystems, I can add a new disk, extend the VG, extend the LV, then easily extend the FS. It's hard to do that if you have partitioned everything, absolutely, with fdisk (although I suppose you could still extend the VGs with new disks, despite the strange fdisk partitioning).
I want to start by saying I already resolved my issue but I want to understand why I am seeing what I am seeing.
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