/dev/sdb /dev/sdc /dev/sdd /dev/sde Trouble is that I can't tell which LUN is associated to which device. I need to remove and replace some of the luns but I can't tell which devices they map to in the host OS environment.

Jul 28, 2015 · The 00 is at the start of all our LUNs so we just name the multipath device using the last 2 octets (b100 for first and b101) for second. We use "hldev" to let us know it is a Hitachi LDEV (LUN). The resulting path will be /dev/mapper/hdlev#### and that is what we use in our other commands such as pvcreate and vgcreate in LVM.

Yes it was new I had done a fdisk on /dev/sdb to create /dev/sdb1. I tried to run an mkfs on /dev/sdb1 but to no avail I ran the pvcreate on /dev/sdb1 and it failed. I found out there was a new /dev/dm-3 and discovered it was the new disk. I could run an mkfs on /dev/dm-3 and was able to mount /dev/dm-3.

Oct 12, 2016 · Ik have a little problem, i'm working on a Red Hat Enterprise Linux Server release 6.5 (Santiago)system (for a storage exam) and i need to connect to a iscsi lun on a NetApp filer (Ontap 8.3). The Lun was on a older system and for the exam i …

Jan 10, 2018 · Replacing 200 GB LUN with 100 GB LUN in LVM: rajaniyer123: Linux - Enterprise: 4: 03-27-2012 12:32 PM: Does the WWID of a LUN change if a hard drive needs to be replaced? jeriryan: Linux - Hardware: 4: 01-10-2011 07:21 PM: Where in Device Mapper is the unique long WWID or UID of the LUN virtual disk stored? DougStorage: Linux - Hardware: 1: 03 ...

Feb 20, 2010 · Now, when doing an ls -l on /dev/disk/by-path, she recognized parts of the filesnames as identifiers corresponding to the wwn's of the individual paths (All 140+). Unfortunately, I have no knowledge of how to map that back to the LUNs and LUN id's I'm seeing in multipath / scsi_id output.

Jun 25, 2010 · The LUN's are mounted on RHEL 5 server using LVM2. They are just linear Logical volumes with file system mounted. Now using hostt based mirroring we are trying to migrate the data to another SAN array without any downtime to existing applications/database.

Sep 13, 2011 · Trying to understand why I see duplicate /dev/dm- devices and what the logic here is. Example: I have 2 HBA's, that can each see 4 disk controllers, totalling 8 paths to a disk. device-mapper-multipath handles the multipathing and …

Dec 21, 2013 · Glad you got it solved. You might want to investigate the drive now that it is mounted and working so that you know more details of it. That is to say save your multipath output so you know the underlying /dev/sd* components in it and also verify nothing else is using any part of it (i.e. the /dev/mpath device, the /dev/mapper or any of the /dev/sd* component devices) in som

Jul 20, 2012 · Mostly RHEL 5.x I usually unmount the filesystem, then remove it from storage side, then rescan and what happens next is multipath starts throwing tons of errors in /var/log/messages, so I would edit multipath.conf remove the alias and lun and do a multipath -r, but would still keep saying path is down.