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We have RHEL 5.9 and NetApp 7 mode storage. I have problem in creating partition in those NetApp LUNs It is not allowing me to create partition "pvcreate command failed. Command attempted: "/usr/sbin/pvcreate -M 2 /dev/sde" -system error message: device /dev/sde not ound (or ignored by filtering)". We tried a lot of things, but didn't help. Currently we investigate multipath.conf file and lvm.conf file.
Does anyone have any idea what's wrong?
I don't have much experience with multi-path, or netapp. I assume you are using iscsi of some type that makes block-level access to the netapp LUNs, and sde is only ONE of the devices that your multipath-device will eventually refer to.
First, does /dev/sde exist? ie: does it appear in the system boot messages, or the output of dmesg? If it does not, there is some sort of issue at the kernel driver level.
If it does exist, can you run simpler programs like "fdisk /dev/sde" on it?
Second, does the netapp allow partition-table level access, or does it have some sort of security blockage that needs to be loosened when first creating partitions? For that matter, does your user "root" translate across to the netapp? (I am mixing my nfs knowledge: disregard as needed if it doesn't apply...)
Third (here is where my understanding gets fuzzy) if sde is the combined device, you may need to access the individual devices.
Normally, Netapp Ontap has its own OS and filesystem. It CAN provide direct lun access... but it is (as I recall) an added expense, where NFS was part of the base license.
The NetApp filesystem is more efficient on NetApp - it allows failover, checkpointing, and local recovery, as well as detecting pre-failure modes of its disks, and allows for replacement/updates on the fly...
Using NFS is faster and more efficient (if you have the right infrastructure you can backup an entire 16TB filesystem to another in about 9 hours).
I wouldn't use raw lun access - loss of redundancy, and recovery mostly. NFS allows the same filesystem to be shared...