HP 3PAR Ubuntu Operating System Implementation Guide

3 TESTLUNS.3 ubuntuhost ---------------- --- host
4 TESTLUNS.4 ubuntuhost ---------------- --- host
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5 total
In the example above, there are five paths to the HP 3PAR StoreServ Storage from each HBA port.
NOTE: Exporting VLUNs to an iSCSI host is the same as exporting VLUNs to a host that has a
Fibre Channel connection to the HP 3PAR StoreServ Storage.
The showvlun output is different for hosts with iSCSI connection. For example:
# showvlun
Active VLUNs
Lun VVName HostName --------Host_WWN/iSCSI_Name-------- Port Type
0 TESTLUNS.0 sqa-dl145-04 iqn.1994-05.com.ubuntuubuntu:a3df53b0a32d 0:3:1 host
1 TESTLUNS.1 sqa-dl145-04 iqn.1994-05.com.ubuntu:a3df53b0a32d 0:3:1 host
2 TESTLUNS.2 sqa-dl145-04 iqn.1994-05.com.ubuntu:a3df53b0a32d 0:3:1 host
3 TESTLUNS.3 sqa-dl145-04 iqn.1994-05.com.ubuntu:a3df53b0a32d 0:3:1 host
4 TESTLUNS.4 sqa-dl145-04 iqn.1994-05.com.ubuntu:a3df53b0a32d 0:3:1 host
0 TESTLUNS.0 sqa-dl145-04 iqn.1994-05.com.ubuntu:a3df53b0a32d 1:3:1 host
1 TESTLUNS.1 sqa-dl145-04 iqn.1994-05.com.ubuntu:a3df53b0a32d 1:3:1 host
2 TESTLUNS.2 sqa-dl145-04 iqn.1994-05.com.ubuntu:a3df53b0a32d 1:3:1 host
3 TESTLUNS.3 sqa-dl145-04 iqn.1994-05.com.ubuntu:a3df53b0a32d 1:3:1 host
4 TESTLUNS.4 sqa-dl145-04 iqn.1994-05.com.ubuntu:a3df53b0a32d 1:3:1 host
---------------------------------------------------------------------------
10 total
Restrictions on Volume Size and Number
Follow the guidelines for creating virtual volumes (VVs) and virtual LUNs (VLUNs) in the HP 3PAR
Command Line Interface Administrator’s Manual while adhering to these cautions and guidelines:
• This configuration supports sparse LUNs (meaning that LUNs may be skipped). LUNs may
also be exported in non-ascending order (e.g. 0, 5, 7, 3).
• The HP 3PAR StoreServ Storage supports the exportation of VLUNs with LUNs in the range
from 0 to 16383.
• The maximum LUN size that can be exported to a Ubuntu host is 16 TB.
Discovering New Devices/New Partitioned Devices without rebooting
1. Scan all targets for a host to make its new device known to the middle layer of SCSI subsystem.
# rescan-scsi-bus.sh [options]
The rescan-scsi-bus.sh script is in scsitools package. The software package can be
installed using aptitude tool or apt-get scsitools.
2. Once new devices have been discovered with the rescan-scsi-bus.sh script, run the
multipath command to recognize the devices for DM-MPIO configuration.
# multipath
Restrictions on Volume Size and Number 23