Hi, As a beginner, I'm reading again and again, but I'm not sure of the best way to do : Through the oVirt web manager, I'm trying to create an iSCSI storage domain. On my Equalogic SAN, I've created a volume with no restriction access (for the time being). I have two hypervisors on which I'm quite sure my network config is good enough for now (two nics bonded for the management, and 2 nics bonded for the iscsi). Everything is pinging ok. Networking is not an issue. In the ovirt web manager, I try to create the very first storage domain, of iscsi type of course. I choose one of the node, then the iscsi discovery + login is working fine. I can see my Equalogic volume, I'm checking it, and saving with the OK button, and I get the following error : > "Error while executing action New SAN Storage Domain: Physical device > initialization failed. Check that the device is empty. Please remove > all files and partitions from the device." Not very interesting, but the node log file is more instructive : > Thread-2767::INFO::2013-01-16 > 13:35:57,064::logUtils::37::dispatcher::(wrapper) Run and protect: > createVG(vgname='7becc578-a94b-41f4-bbec-8df5fe9f46c0', > devlist=['364ed2ad5297bb022fd0ee5ba36ad91a0'], options=None) > > Thread-2767::DEBUG::2013-01-16 > 13:35:57,066::__init__::1249::Storage.Misc.excCmd::(_log) '/usr/bin/sudo > -n /sbin/lvm pvcreate --config " devices { preferred_names = > [\\"^/dev/mapper/\\"] ignore_suspended_devices=1 write_cache_state=0 > disable_after_error_count=3 filter = [ > \\"a%3600508e000000000ec7b6d8dea602b0e|364ed2ad5297bb022fd0ee5ba36ad91a0%\\", > > \\"r%.*%\\" ] } global { locking_type=1 prioritise_write_locks=1 > wait_for_locks=1 } backup { retain_min = 50 retain_days = 0 } " > --metadatasize 128m --metadatacopies 2 --metadataignore y > /dev/mapper/364ed2ad5297bb022fd0ee5ba36ad91a0' (cwd None) > > Thread-2767::DEBUG::2013-01-16 > 13:35:57,147::__init__::1249::Storage.Misc.excCmd::(_log) FAILED: <err> > = " Can't open /dev/mapper/364ed2ad5297bb022fd0ee5ba36ad91a0 > exclusively. Mounted filesystem?\n"; <rc> = 5 > > Thread-2767::DEBUG::2013-01-16 > 13:35:57,149::__init__::1249::Storage.Misc.excCmd::(_log) '/usr/bin/sudo > -n /sbin/lvm pvs --config " devices { preferred_names = > [\\"^/dev/mapper/\\"] ignore_suspended_devices=1 write_cache_state=0 > disable_after_error_count=3 filter = [ > \\"a%3600508e000000000ec7b6d8dea602b0e|364ed2ad5297bb022fd0ee5ba36ad91a0%\\", > > \\"r%.*%\\" ] } global { locking_type=1 prioritise_write_locks=1 > wait_for_locks=1 } backup { retain_min = 50 retain_days = 0 } " -o > vg_name,pv_name --noheading > /dev/mapper/364ed2ad5297bb022fd0ee5ba36ad91a0' (cwd None) > > Thread-2767::DEBUG::2013-01-16 > 13:35:57,224::__init__::1249::Storage.Misc.excCmd::(_log) FAILED: <err> > = ' No physical volume label read from > /dev/mapper/364ed2ad5297bb022fd0ee5ba36ad91a0\n Failed to read physical > volume "/dev/mapper/364ed2ad5297bb022fd0ee5ba36ad91a0"\n'; <rc> = 5 > > Thread-2767::ERROR::2013-01-16 > 13:35:57,226::task::853::TaskManager.Task::(_setError) > Task=`1c5b8931-0085-489c-8962-ff5cc1323dc7`::Unexpected error > > Traceback (most recent call last): > File "/usr/share/vdsm/storage/task.py", line 861, in _run > File "/usr/share/vdsm/logUtils.py", line 38, in wrapper > File "/usr/share/vdsm/storage/hsm.py", line 1680, in createVG > File "/usr/share/vdsm/storage/lvm.py", line 788, in createVG > File "/usr/share/vdsm/storage/lvm.py", line 631, in _initpvs > PhysDevInitializationError: Failed to initialize physical device: > ("found: {} notFound: > ('/dev/mapper/364ed2ad5297bb022fd0ee5ba36ad91a0',)",) I guess the interesting part is : > Can't open /dev/mapper/364ed2ad5297bb022fd0ee5ba36ad91a0 exclusively. > Mounted filesystem? On any node, this partition is not mounted. But I have set up the access to this volume as "shared" on the Equalogic SAN, not knowing whether I should do so? I see both nodes connected on the same volume. I tried to remove this permit, but it didn't help. I also found Redhat answering such a question : > There are two ways to clear this error: > > - Remove VG from the Storage LUN using vgremove command. Run this > command from one of the hypervisors. > - Clear the first 4K from the disk . Execute the following from > one of the hypervisors: > > # dd if=/dev/zero of=/dev/mapper/diskname bs=4k count=1 I did try that, but with no luck. Now, two things : - Do I have to keep the access to this volume shared/allowed to all the hypervisors dedicated to this volume? - What is the problem with the pvcreate command?