System Administration Commands stmsboot(1M)
NAME
stmsboot - administration program for the Solaris I/O mul-
tipathing featureSYNOPSIS
/usr/sbin/stmsboot [[-D (fp | mpt | mpt_sas | iscsi) ] -d | -e | -u]
| -L | -l controller_number]
DESCRIPTION
The Solaris I/O multipathing feature is a multipathing solu-
tion for storage devices that is part of the Solaris operat-
ing environment. This feature was formerly known as Sun StorEdge Traffic Manager (STMS) or MPxIO.The stmsboot program is an administrative command to manage
enumeration of multipath-capable devices with Solaris I/O
multipathing. Solaris I/O multipathing-enabled devices are
enumerated under scsi_vhci(7D), providing multipathing capa-
bilities. Solaris I/O multipathing-disabled devices are
enumerated under the physical controller.In the /dev and /devices trees, Solaris I/O multipathing-
enabled devices receive new names that indicate that theyare under Solaris I/O multipathing control. This means a device will have a different name from its original name
(after enabling) when it is under Solaris I/O multipathing
control. The stmsboot command automatically updates
/etc/vfstab and dump configuration to reflect the devicenames changes when enabling or disabling Solaris I/O mul-
tipathing. One reboot is required for changes to take effect. OPTIONS The following options are supported:-e [ -E fp | mpt | mpt_sas | iscsi ]
Enables Solaris I/O multipathing on all supported
multipath-capable controller ports, including fp(7D),
mpt(7D), mpt_sas(7D), and iscsi(7D) port drivers.
Multipath-capable ports include fibre channel (fp(7D))
controller ports and SAS (mpt(7D) or mpt_sas(7D)) con-
troller ports. Following this enabling, you are promptedto reboot. During the reboot, vfstab and the dump confi-
guration will be updated to reflect the device namechanges. Specifying -D mpt, -D mpt_sas, or -D fp limits
the enabling operation to ports attached using the specified driver.SunOS 5.11 Last change: 19 May 2010 1
System Administration Commands stmsboot(1M)
-d [ -D fp | mpt | mpt_sas | iscsi ]
Disables Solaris I/O multipathing on all supported
multipath-capable controller ports, including fp(7D),
mpt(7D), mpt_sas(7D), and iscsi(7D) port drivers.
Multipath-capable ports include fibre channel (fp(7D))
controller ports and SAS (mpt(7D) or mpt_sas(7D)) con-
troller ports. Following this disabling, you are prompted to reboot. During the reboot, vfstab and the dump configuration will be updated to reflect the devicename changes. Specifying -D mpt, -D mpt_sas, or -D fp
limits the disabling operation to ports attached using the specified driver.-u [ -D fp | mpt | mpt_sas | iscsi ]
Updates vfstab and the dump configuration after you havemanually modified the configuration to have Solaris I/O multipathing enabled or disabled on specific fp(7D),
mpt(7D), mpt_sas(7D), and iscsi(7D) controller ports.
This option prompts you to reboot. During the reboot, vfstab and the dump configuration will be updated to reflect the device name changes.-L
Display the device name changes from non-Solaris I/O
multipathing device names to Solaris I/O multipathing
device names for multipath-enabled controller ports. If
Solaris I/O multipathing is not enabled, then no map-
pings are displayed.-l controller_number
Display the device name changes from non-Solaris I/O
multipathing device names to Solaris I/O multipathing device names for the specified controller. If Solaris
I/O multipathing is not enabled, then no mappings are displayed.
Note that mpt_sas(7D) has MPxIO turned on by default. This
means that when using the -L or -l option with -D mpt_sas,
stmsboot does not display any non-multipathed and mul-
tipathed device names.USAGE
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System Administration Commands stmsboot(1M)
The primary function of stmsboot is to control the enabling
and disabling of Solaris I/O multipathing on the host. The
utility automatically updates vfstab(4) and dumpadm(1M) con-
figuration to reflect device name changes. The systemadministrator is responsible for modifying application con-
figuration (for example, backup software, DBMS, and so forth) to reflect updated device names.The -L and -l options display the mapping between mul-
tipathed and non-multipathed device names. These options
function only after changes to the Solaris I/O multipathing configuration have taken effect, that is, following the
reboot after invoking stmsboot -e.
ZFS datasets, including ZFS root datasets, are correctlyhandled by stmsboot.
EXAMPLES
Example 1 Enabling Solaris I/O Multipathing
To enable Solaris I/O multipathing for all multipath-capable
controllers, run:# stmsboot -e
To enable Solaris I/O multipathing on multipath-capable
mpt(7D) controller ports, enter:# stmsboot -D mpt -e
To enable Solaris I/O multipathing on multipath-capable
mpt_sas(7D) controller ports, enter:
# stmsboot -D mpt_sas -e
To enable Solaris I/O Multipathing on multipath-capable
fibre channel controller ports, enter:SunOS 5.11 Last change: 19 May 2010 3
System Administration Commands stmsboot(1M)
# stmsboot -D fp -e
To enable Solaris I/O Multipathing on multipath-capable
iSCSI controller ports, enter:# stmsboot -D iscsi -e
Example 2 Disabling Solaris I/O Multipathing
To disable Solaris I/O multipathing on all multipath-capable
controllers, enter:# stmsboot -d
To disable Solaris I/O multipathing on multipath-capable
mpt(7D) controller ports, enter:# stmsboot -D mpt -d
To disable Solaris I/O multipathing on multipath-capable
mpt_sas(7D) controller ports, enter:
# stmsboot -D mpt_sas -d
To disable Solaris I/O multipathing on multipath-capable
iSCSI controller ports, enter:# stmsboot -D iscsi -d
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System Administration Commands stmsboot(1M)
To disable Solaris I/O multipathing on multipath-capable
fibre channel controller ports, enter:# stmsboot -D fp -d
Example 3 Enabling Solaris I/O Multipathing on Selected Ports
To enable Solaris I/O multipathing on specific fibre channel controller ports and disable the feature on others, manually
edit the /kernel/drv/fp.conf file. (Seefp(7D).) The follow-
ing command will update vfstab(4) and dumpadm(1M) configura-
tions to reflect the changed device names:# stmsboot -u
A similar procedure involving the /kernel/drv/mpt.conf file should be followed for devices attached by means of the mpt(7D) driver. For devices attached by means of the iscsi(7D) driver, follow a similar procedure that uses the /kernel/drv/iscsi.conf file.ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcs, system/library ||_____________________________|_____________________________|
| Interface Stability | Obsolete ||_____________________________|_____________________________|
SEE ALSO
dumpadm(1M), fsck(1M), mpathadm(1M), ufsdump(1M), zfs(1M), zpool(1M), dumpdates(4), vfstab(4), emlxs(7D), fcp(7D),fp(7D), iscsi(7D), mpt(7D), mpt_sas(7D), qlc(7D),
scsi_vhci(7D)
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System Administration Commands stmsboot(1M)
Solaris SAN Configuration and Multipathing Guide (see http://docs.sun.com) Consult a particular storage product's systemadministrator's guide and release notes for further informa-
tion specific to that product. NOTESSolaris I/O multipathing is not supported on all devices.
After enabling Solaris I/O multipathing, only supported dev-
ices are placed under Solaris I/O multipathing control.
Non-supported devices remain unchanged.
For Solaris releases prior to the current release, the -e
and -d options replace mpxio-disable property entries with a
global mpxio-disable entry in fp.conf.
Enabling Solaris I/O Multipathing on a Sun StorEdge Disk Array The following applies to Sun StoreEdge T3, 3910, 3960, 6120, and 6320 storage subsystems.
To place your Sun StorEdge disk subsystem under Solaris I/O
multipathing control, in addition to enabling Solaris I/O
multipathing, the mp_support of the subsystem must be set to
mpxio mode. The preferred sequence is to change thesubsystem's mp_support to mpxio mode, then run stmsboot -e.
If Solaris I/O multipathing is already enabled but the
subsystem's mp_support is not in mpxio mode, then change the
mp_support to mpxio mode and run stmsboot -u.
Refer to the Sun StorEdge Administrator's Guide for your subsystem for more details. Using ufsdump The ufsdump(1M) command records details of filesystem dumps in /etc/dumpdates (see dumpdates(4)). Among other items, the entries contain device names. An effect of the "active"stmsboot options (-e, -d, and -u) is to change the device
name of a storage device.Because stmsboot does not modify dumpdates, entries will
refer to obsolete device names, that is, device names thatwere in effect before Solaris I/O multipathing configuration changes were performed. In this situation ufsdump will behave as if no previous dump of the filesystem had been performed. A level 0 dump will be performed.
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System Administration Commands stmsboot(1M)
Procedure to Use stmsboot in Conjunction with Sun Cluster
If possible, invoke stmsboot -e before installing Sun Clus-
ter software. After executing stmsboot, install Sun Cluster
software normally. If Sun Cluster software is installed before executingstmsboot, follow this procedure:
On each machine in the cluster where Solaris I/O multipath-
ing is required, execute:# stmsboot -e
...and allow the system to reboot. When the system comes up, enter the following two commands:1. # /usr/cluster/bin/scdidadm -C
2. # /usr/cluster/bin/scdidadm -r
The preceding commands update did mappings with new device names while preserving did instance numbers for disks that are connected to multiple cluster nodes. did instance numbers of the local disks might not be preserved. For this reason, the did disk names for local disks might change. 3. Update /etc/vfstab to reflect any new did disk names for your local disks. 4. Reboot the system.To disable the Solaris multipathing feature, use stmsboot -d
(instead of stmsboot -e), then follow the procedure above.
To view mappings between the old and new device names, runstmsboot -L. To view did device name mappings, run
/usr/cluster/bin/scdidadm -L.
With active-passive storage arrays, it is possible that
while your host is rebooting the array controller could failover the path that a particular target is using. In thisSunOS 5.11 Last change: 19 May 2010 7
System Administration Commands stmsboot(1M)
scenario, fsck(1M) will fail to open the physical path listed in /etc/vfstab. Thesvc:/system/filesystem/local:default SMF service will tran-
sition to a maintenance state as a result. To rectify this, consult the documentation for your storage array to failback the path. The mpathadm(1M) can assist with determining the active and passive path(s). LIMITATIONSOn x86 platforms, the current Solaris release does not sup-
port disabling Solaris I/O multipathing of boot devices
attached by means of fibre channel. Solaris I/O multipathing
is always enabled for supported fibre channel-attached boot
devices. Disabling Solaris I/O multipathing in this situa-
tion must be performed on a per-port basis. See fp(7D).
Executing devfsadm -C removes obsolete device entries that
stmsboot relies on. This will prevent correct operation of
the -d option for boot devices (regardless of platform type)
and the -L option.
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