Troubleshoot the Block Storage configuration

Most Block Storage errors are caused by incorrect volume configurations that result in volume creation failues. To resolve these failures, review these logs:

cinder-api log (/var/log/cinder/api.log)
cinder-volume log (/var/log/cinder/volume.log)

The cinder-api log is useful for determining if you have endpoint or connectivity issues. If you send a request to create a volume and it fails, review the cinder-api log to determine whether the request made it to the Block Storage service. If the request is logged and you see no errors or trace-backs, check the cinder-volume log for errors or trace-backs.

	Note
	Create commands are listed in the `cinder-api` log.

These entries in the cinder.openstack.common.log file can be used to assist in troubleshooting your block storage configuration.

# Print debugging output (set logging level to DEBUG instead
# of default WARNING level). (boolean value)
#debug=false

# Print more verbose output (set logging level to INFO instead
# of default WARNING level). (boolean value)
#verbose=false

# Log output to standard error (boolean value)
#use_stderr=true

# Default file mode used when creating log files (string
# value)
#logfile_mode=0644

# format string to use for log messages with context (string
# value)
#logging_context_format_string=%(asctime)s.%(msecs)03d %(levelname)s %(name)s [%(request_id)s %(user)s %(tenant)s] %(instance)s%(message)s

# format string to use for log mes #logging_default_format_string=%(asctime)s.%(msecs)03d %(process)d %(levelname)s %(name)s [-] %(instance)s%(message)s

# data to append to log format when level is DEBUG (string
# value)
#logging_debug_format_suffix=%(funcName)s %(pathname)s:%(lineno)d

# prefix each line of exception output with this format
# (string value)
#logging_exception_prefix=%(asctime)s.%(msecs)03d %(process)d TRACE %(name)s %(instance)s

# list of logger=LEVEL pairs (list value)
#default_log_levels=amqplib=WARN,sqlalchemy=WARN,boto=WARN,suds=INFO,keystone=INFO,eventlet.wsgi.server=WARNsages without context
# (string value)

# If an instance is passed with the log message, format it
# like this (string value)
#instance_format="[instance: %(uuid)s]"

# If an instance UUID is passed with the log message, format
# it like this (string value)
# A logging.Formatter log message format string which may use
# any of the available logging.LogRecord attributes. Default:
# %(default)s (string value)
#log_format=%(asctime)s %(levelname)8s [%(name)s] %(message)s

# Format string for %%(asctime)s in log records. Default:
# %(default)s (string value)
#log_date_format=%Y-%m-%d %H:%M:%S

# (Optional) Name of log file to output to. If not set,
# logging will go to stdout. (string value)
#log_file=<None>

# (Optional) The directory to keep log files in (will be
# prepended to --log-file) (string value)
#log_dir=<None>
#instance_uuid_format="[instance: %(uuid)s]"

# If this option is specified, the logging configuration file
# specified is used and overrides any other logging options
# specified. Please see the Python logging module
# documentation for details on logging configuration files.
# (string value) # Use syslog for logging. (boolean value)
#use_syslog=false

# syslog facility to receive log lines (string value)
#syslog_log_facility=LOG_USER
#log_config=<None>

These common issues might occur during configuration. To correct, use these suggested solutions.

Issues with state_path and volumes_dir settings.
The OpenStack Block Storage uses tgtd as the default iscsi helper and implements persistent targets. This means that in the case of a tgt restart or even a node reboot your existing volumes on that node will be restored automatically with their original IQN.
In order to make this possible the iSCSI target information needs to be stored in a file on creation that can be queried in case of restart of the tgt daemon. By default, Block Storage uses a state_path variable, which if installing with Yum or APT should be set to /var/lib/cinder/. The next part is the volumes_dir variable, by default this just simply appends a "volumes" directory to the state_path. The result is a file-tree /var/lib/cinder/volumes/.
While this should all be handled by the installer, it can go wrong. If you have trouble creating volumes and this directory does not exist you should see an error message in the cinder-volume log indicating that the volumes_dir does not exist, and it should provide information about which path it was looking for.
The persistent tgt include file.
Along with the volumes_dir option, the iSCSI target driver also needs to be configured to look in the correct place for the persist files. This is a simple entry in the /etc/tgt/conf.d file that you should have set when you installed OpenStack. If issues occur, verify that you have a /etc/tgt/conf.d/cinder.conf file.
If the file is not present, create it with this command:
```
# echo 'include /var/lib/cinder/volumes/ *' >> /etc/tgt/conf.d/cinder.conf
```
No sign of attach call in the cinder-api log.
This is most likely going to be a minor adjustment to your nova.conf file. Make sure that your nova.conf has this entry:
```
volume_api_class=nova.volume.cinder.API
```
Failed to create iscsi target error in the cinder-volume.log file.
```
2013-03-12 01:35:43 1248 TRACE cinder.openstack.common.rpc.amqp ISCSITargetCreateFailed: Failed to create iscsi target for volume volume-137641b2-af72-4a2f-b243-65fdccd38780.
```
You might see this error in cinder-volume.log after trying to create a volume that is 1 GB. To fix this issue:
Change content of the /etc/tgt/targets.conf from include /etc/tgt/conf.d/*.conf to include /etc/tgt/conf.d/cinder_tgt.conf, as follows:
```
include /etc/tgt/conf.d/cinder_tgt.conf
include /etc/tgt/conf.d/cinder.conf
default-driver iscsi
```
Restart tgt and cinder-* services so they pick up the new configuration.

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