[Users] Fail to connect to an iSCSI Eq. LUN
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? -- Nicolas Ecarnot
Too bad : I did not change anything, and time passing by, it all came to work... Damn, this is the worst sysadmin situation : this is working, and you don't know why ! Seriously : it indeed appears that the choice of shared access is the good one (until someone proves it wrong). More seriously : I shut down the second node, and made the conection with only the first node alive. In that case, no possible conflict. -- Nicolas Ecarnot Le 16/01/2013 15:12, Nicolas Ecarnot a écrit :
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?
-- Nicolas Ecarnot
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Nicolas Ecarnot