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Guidelines for OpenVMS Cluster Configurations
7.5.2.2 Use of Worldwide Identifiers (WWIDs)
For each Fibre Channel tape device name, OpenVMS must uniquely identify
the physical device that is associated with that name.
In parallel SCSI, directly attached devices are uniquely identified by
their physical path (port/target/LUN). Fibre Channel disks are uniquely
identified by user-defined identifiers (UDIDs). These strategies are
either unscalable or unavailable for Fibre Channel tapes and medium
changers.
Therefore, the identifier for a given Fibre Channel tape or medium
changer device is its worldwide identifier (WWID). The WWID resides in
the device firmware and is required to be unique by the Fibre Channel
standards.
WWIDs can take several forms, for example:
- IEEE registered WWID (64-bit binary)
- Vendor ID plus product ID plus serial number (ASCII)
The overall WWID consists of the WWID data prefixed by a binary WWID
header, which is a longword describing the length and type of WWID data.
In general, if a device reports an IEEE WWID, OpenVMS chooses this as
the unique identifying WWID for the device. If the device does not
report such a WWID, then the ASCII WWID is used. If the device reports
neither an IEEE WWID nor serial number information, then OpenVMS does
not configure the device. During the device discovery process, OpenVMS
rejects the device with the following message:
%SYSMAN-E-NOWWID, error for device Product-ID, no valid WWID found.
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The WWID structures can be a mix of binary and ASCII data. These
formats are displayable and are intended to be consistent with those
defined by the console WWIDMGR utility. Refer to the Wwidmgr Users'
Manual for additional information. (The Wwidmgr Users'
Manual is available in the [.DOC] directory of the Alpha Systems
Firmware Update CD-ROM.)
Note that if the data following the WWID header is pure ASCII data, it
must be enclosed in double quotation marks.
The displayable format of a 64-bit IEEE WWID consists of an 8-digit
hexadecimal number in ASCII (the WWID header), followed by a colon (:)
and then the IEEE WWID data. For example:
0C000008:0800-4606-8010-CD3C
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The displayable format of an ASCII WWID consists of an 8-digit WWID
header, followed by a colon (:) and then the concatenation of the
8-byte vendor ID plus the 16-byte product ID plus the serial number.
For example:
04100022:"COMPAQ DLT8000 JF71209240"
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Note
Occasionally, an ASCII WWID may contain nonprintable characters in the
serial number. In a displayable format, such a character is represented
by \nn, where nn is the 2-digit ASCII hexidecimal
value of the character. For example, a null is represented by \00.
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7.5.2.3 File-Based Device Naming
Fibre Channel tape and medium changer devices are configured according
to information found in the SYS$SYSTEM:SYS$DEVICES.DAT file. This is an
ASCII file consisting of two consecutive records per device, where the
two records are in the following form:
[Device $2$devnam]
WWID = displayable_identifier
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During autoconfiguration, the Fibre Channel is probed and the WWIDs are
fetched for all devices. If the fetched WWID matches an entry in the
memory-resident copy of the SYS$DEVICES.DAT file, then the device is
configured using the device name that has been paired with that WWID.
Note
The SYS$DEVICES.DAT file is also used for port allocation class (PAC)
information. Fibre Channel tape-naming is a second use of this same
file, even though PACs and Fibre Channel tapes are not related, other
than their common need to access file-based device information at boot
time.
By default, the SYS$DEVICES.DAT file is created in the cluster common
directory, SYS$COMMON:[SYSEXE].
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As an example, the following portion of SYS$DEVICES.DAT causes the
eventual configuration of devices named $2$MGA300 and $2$MGA23:
!
[Device $2$MGA300]
WWID = 04100022:"COMPAQ DLT8000 JF71209240"
!
[Device $2$mga23]
WWID = 04100022:"DEC TZ89 (C) DECJL01164302"
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Although the file is typically read and written only by OpenVMS
utilities, in rare instances you may need to edit the file. You can
change only the unit number of the device, as described in
Section 7.5.5. The internal syntax rules governing the file are
summarized as follows:
- Comment lines (beginning with !) and blank lines are permitted.
- Any white space (or none) can separate
[Device
from the device name represented by
$2$xxx
].
- Failure to supply the $2$ prefix will result in a console warning.
Similarly, on the line containing
WWID =
, any white space (or none) can appear on either side of the equals
sign. All lines must be left-justified, and all lines must be less than
512 characters.
The parsing of this file is not case sensitive, with one important
exception: all characters enclosed within double quotation marks are
taken literally, so that characters such as spaces and lowercase
letters are significant. In the case of ASCII data enclosed by double
quotation marks, there must be no space between the colon and the
double quotation mark.
Also, if more than one
WWID =
line follows a single
[Device devnam]
line, the last
WWID =
value takes precedence. Normally, however, there is exactly one
WWID =
line per
[Device devnam]
line.
Similarly, if two or more
[Device devnam]
lines specify the same device name but different WWIDs, only the last
device name and WWID specified in the file is used.
This file is read at boot time, and it is also read from and written to
by the SYSMAN IO FIND_WWID command. If there are additional
system-specific copies of the SYS$DEVICES.DAT file, their tape naming
records become automatically compatible as a result of running SYSMAN
IO FIND_WWID on each system. The SYSMAN IO FIND_WWID command is
described in more detail in the following section. The SYS$DEVICES.DAT
file may also be modified by the SYSMAN IO CREATE_WWID and REPLACE_WWID
commands which are described below.
7.5.3 Management Support for Fibre Channel Tape Devices
The following System Management utility (SYSMAN) commands are provided
for managing Fibre Channel tape devices:
- IO FIND_WWID
Probes all ports on the Fibre Channel and detects
all previously undiscovered tapes and medium changers, and assigns a
name to each. Displays a list of the devices and their assigned device
names, and automatically records this information in the
SYS$SYSTEM:SYS$DEVICES.DAT file. Also updates relevant local and
clusterwide memory structures. It should be executed clusterwide.
Use this command prior to running the SYSMAN command IO
AUTOCONFIGURE.
Requires the CMKRNL privilege.
- IO LIST_WWID
Lists all tape device WWIDs that are not yet
configured on Fibre Channel. Use this command prior to running the
SYSMAN command IO CREATE_WWID.
Requires the CMKRNL privilege.
- IO CREATE_WWID
Enables the user to assign a specific (and
previously unused) device name to a specific (and previously unused)
WWID from the SYSMAN IO LIST_WWID display. It should be executed
clusterwide. The command should then be followed by a clusterwide
SYSMAN IO AUTO command to actually configure the device.
This
command offers an alternative to the SYSMAN IO FIND_WWID command, which
chooses system-generated device names for the discovered WWIDs. The IO
CREATE command should not be used after the IO FIND command as a means
of redefining WWID correlations. The device and WWID strings specified
in IO CREATE_WWID should not be in use elsewhere in the cluster.
Requires the CMKRNL privilege.
- IO REPLACE_WWID
Updates appropriate file and memory data
structures in case one tape drive must be physically replaced by
another tape drive at the same FC LUN location.
Requires the CMKRNL
privilege.
The following DCL support for Fibre Channel tape devices is available:
- The SHOW DEVICE/FULL command displays the WWID for Fibre Channel
tape devices.
- The F$GETDVI lexical function supports the keyword
WWID
, which returns the Fibre Channel tape device's WWID.
7.5.4 Configuring a Fibre Channel Tape Device
This section lists the steps required to configure a new tape or medium
changer on the Fibre Channel.
7.5.4.1 Basic Configuration Steps: Summary
The basic steps for configuring new Fibre Channel tape devices in a
cluster are as follows:
- Power on the new tape device or devices.
- If you are using the MDR, power cycle the MDR to update MDR mapping
information.
If you are using the NSR, use Visual Manager to update
the mapping information as follows:
- Click on the Mapping submenu. Username is 'root', password is
'password'.
- Ensure the 'Select Map' box indicates 'Indexed' mode.
- Click on the 'Edit/View' box that is next to the 'Select Map' box.
- This brings up an empty indexed map. Under the 'Priority' option,
select 'Target/Bus' Priority and then click on 'Fill Map'. Note that
the Target/Bus priority ensures that the controller LUN, also known as
the Active Fabric (AF) LUN, is mapped to LUN 0.
- The new map appears. Close that window, which then returns you to
the Mapping submenu.
- If the NSR has additional FC ports besides FC port 0, click on 'FC
Port 1' and repeat the mapping process for FC Port 1, and any other FC
ports.
- Click on 'Reboot' to make the updates to the maps take effect.
Further details on the Visual Manager are documented in the HP
StorageWorks network storage router M2402 user guide.
- Run SYSMAN to assign device names and configure the devices:
$ MC SYSMAN
SYSMAN> SET ENVIRONMENT/CLUSTER ! Execute on all nodes
SYSMAN> IO FIND_WWID ! Assign names
SYSMAN> IO AUTOCONFIGURE/LOG ! Configure devices
SYSMAN> EXIT
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You need to perform these steps only once for the initial
configuration. After any subsequent system reboot, the devices will
appear automatically.
7.5.4.2 Basic Configuration Steps: Details
Prior to configuring a tape device on Fibre Channel, the worldwide
identifier (WWID) of the device must be detected and stored, along with
a device name, in the text file SYS$SYSTEM:SYS$DEVICES.DAT. This is
usually accomplished by using the SYSMAN command IO FIND_WWID. However,
some users prefer to choose their own devices name for the tape
devices, rather than using the system-generated names assigned by
FIND_WWID. In that case, the user will execute the IO CREATE_WWID
command instead of IO FIND_WWID. IO CREATE_WWID will be described in
the next section, while this current section documents the use of IO
FIND_WWID.
The IO FIND_WWID command probes all ports on the Fibre Channel and
locates all tape and medium changer devices connected to an MDR or NSR.
For tapes and medium changers that have not been detected by a previous
IO FIND_WWID command, IO FIND_WWID assigns a device name, retrieves the
WWID of the device, stores the device name and WWID data in the
SYS$SYSTEM:SYS$DEVICES.DAT file, and updates memory structures.
Since the primary goal of IO FIND_WWID is to populate the
SYS$DEVICES.DAT file, you need to invoke the IO FIND_WWID command only
once for each device. IO FIND_WWID does not configure the
$2$MGAnnnn: device for use by an application.
Once the information is stored in the file, subsequent use of the IO
AUTOCONFIGURE command reads a memory-resident copy of the file and
configures the tape and medium changer devices automatically, loading
or connecting the device drivers as needed. The SYS$DEVICES.DAT file is
read into memory during each system reboot; this action initiates the
automatic configuration of tapes and medium changers on the Fibre
Channel.
Note that running the IO FIND_WWID command for the first time detects
all existing tape and medium changer devices on the system. If you add
additional Fibre Channel tape devices to the system at a later time,
you must first powercycle the MDR to update internal mapping
information, and then run the IO FIND_WWID command again to append the
new device information to the SYS$DEVICES.DAT file. On an NSR, edit the
indexed map to update mapping information.
In an OpenVMS Cluster environment, various data structures in memory
must be updated on each system when a new Fibre Channel tape device is
added. To accomplish this, HP recommends that you run the SYSMAN IO
FIND_WWID command on each Alpha node in the cluster. Alternatively, you
can run IO FIND_WWID on one node, and then reboot the other nodes that
share that same system disk, because the SYS$DEVICES.DAT file is read
at boot time and causes memory structures to be correctly initialized.
In the case of multiple system disks in the cluster, ensure that all
copies of the SYS$DEVICES.DAT file are kept consistent, preferably by
running the IO FIND_WWID command on all nodes. Alternatively, you can
run IO FIND_WWID to update just one SYS$DEVICES.DAT file, and then
manually edit the remaining SYS$DEVICES.DAT files by cutting and
pasting the appropriate device name and WWID records from the original
file to the target files. If this second alternative is used, however,
the remaining nodes must be rebooted in order for the memory-resident
copy of SYS$DEVICES.DAT to be updated.
HP recommends that you refrain from copying the entire original file to
another system disk. The SYS$DEVICES.DAT file is also used to define
port allocation classes (PACs), and PAC entries could be transferred
inadvertently to the target system.
Following is a configuration example using a TL891 tape library on a
single node.
First, the SYSMAN command IO FIND_WWID displays a list of all
previously undiscovered tape devices and their proposed device names.
$ MCR SYSMAN IO FIND_WWID
%SYSMAN-I-OUTPUT, command execution on node SAMPLE
On port _SAMPLE$PGA0:, the following tape WWIDs and their proposed device
names have been found but not yet configured:
[Device $2$GGA0]
WWID=04100024:"DEC TL800 (C) DEC3G9CCR82A017"
[Device $2$MGA0]
WWID=04100022:"DEC TZ89 (C) DECCX939S2777"
[Device $2$MGA1]
WWID=04100022:"DEC TZ89 (C) DECCX942S6295"
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Note that the overall WWID consists of everything to the right of the
equals sign. Each such WWID is unique; however, the header portion may
not be unique, because the header reflects only the basic type and
length of the the WWID data.
The IO FIND_WWID command automatically records the information about
the new tape devices in SYS$SYSTEM:SYS$DEVICES.DAT:
$ TYPE SYS$SYSTEM:SYS$DEVICES.DAT
!
! Updated 23-OCT-2000 14:17:41.85: DEC TL800
!
[Device $2$GGA0]
WWID=04100024:"DEC TL800 (C) DEC3G9CCR82A017"
!
!
! Updated 23-OCT-2000 14:17:41.93: DEC TZ89
!
[Device $2$MGA0]
WWID=04100022:"DEC TZ89 (C) DECCX939S2777"
!
!
! Updated 23-OCT-2000 14:17:42.01: DEC TZ89
!
[Device $2$MGA1]
WWID=04100022:"DEC TZ89 (C) DECCX942S6295"
!
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Next, the SYSMAN command IO AUTOCONFIGURE configures the tape device.
$ MCR SYSMAN IO AUTOCONFIGURE/LOG
%SYSMAN-I-OUTPUT, command execution on node SAMPLE
%IOGEN-I-PREFIX, searching for ICBM with prefix SYS$
%IOGEN-I-PREFIX, searching for ICBM with prefix DECW$
%IOGEN-I-SCSIPOLL, scanning for devices through SCSI port PKA0
%IOGEN-I-SCSIPOLL, scanning for devices through SCSI port PKB0
%IOGEN-I-FIBREPOLL, scanning for devices through FIBRE port PGA0
%IOGEN-I-CONFIGURED, configured device GGA0
%IOGEN-I-CONFIGURED, configured device MGA0
%IOGEN-I-CONFIGURED, configured device MGA1
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Finally, the SHOW DEVICE/FULL command displays the WWID of the tape
device.
$ SHOW DEVICE/FULL $2$MG
Magtape $2$MGA0: (SAMPLE), device type TZ89, is online, file-oriented device,
available to cluster, error logging is enabled, controller supports
compaction (compaction disabled), device supports fastskip.
Error count 0 Operations completed 0
Owner process "" Owner UIC [SYSTEM]
Owner process ID 00000000 Dev Prot S:RWPL,O:RWPL,G:R,W
Reference count 0 Default buffer size 2048
WWID 04100022:"DEC TZ89 (C) DECCX939S2777"
Density default Format Normal-11
Allocation class 2
Volume status: no-unload on dismount, position lost, odd parity.
Magtape $2$MGA1: (SAMPLE), device type TZ89, is online, file-oriented device,
available to cluster, error logging is enabled, controller supports
compaction (compaction disabled), device supports fastskip.
Error count 0 Operations completed 0
Owner process "" Owner UIC [SYSTEM]
Owner process ID 00000000 Dev Prot S:RWPL,O:RWPL,G:R,W
Reference count 0 Default buffer size 2048
WWID 04100022:"DEC TZ89 (C) DECCX942S6295"
Density default Format Normal-11
Allocation class 2
Volume status: no-unload on dismount, position lost, odd parity.
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The F$GETDVI lexical function also retrieves the displayable WWID:
$ write sys$output f$getdvi("$2$MGA0","WWID")
04100022:"DEC TZ89 (C) DECCX939S2777"
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Once the device is named and configured, you can use the device in the
same way that you use parallel SCSI tapes with DCL commands such as
INITIALIZE, MOUNT, BACKUP, and COPY. Refer to the installation guide
for individual tape layered products for details on product-specific
support of Fibre Channel tapes.
Note that while medium changers on Fibre Channel are autoconfigured,
the medium changers on parallel SCSI continue to require the IO CONNECT
command to load the device driver. It is impossible to manually connect
a Fibre Channel medium changer by the SYSMAN IO CONNECT command because
the device name does not imply the device's physical location, as it
does in parallel SCSI.
7.5.4.3 Creating User-Specified Device Names
If you prefer to choose specific names for the tape devices instead of
using the default names generated by IO FIND_WWID, you can use the IO
CREATE_WWID command. For example:
SYSMAN > IO CREATE_WWID $2$MGA3/WWID=04100022:"DEC TZ89 (C) DECCX939S2341"
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The selected name must be of the form $2$GGAn for medium changers and
$2$MGAn for tapes, where n is less than or equal to
9999. The name must not be in use elsewhere in the cluster. The WWID
should be cut and pasted from the output of the IO LIST_WWID display.
The IO CREATE_WWID command is intended only for naming new devices; it
should not be used to rename existing devices. (Renaming existing
devices is discussed in Section 7.5.5.)
The following configuration example uses IO CREATE_WWID to create
user-specified device names for two tapes and a medium changer within
an ESL library. The commands are excuted clusterwide on a 2-node
cluster consisting of nodes SYSTM1 and SYSTM2. Each node has two Fibre
Channel host bus adapters, PGA0 and PGB0, so multiple paths to the tape
are configured.
First, the SYSMAN command IO LIST_WWID displays a list of all
previously undiscovered tape devices.
Systm1> mcr sysman
SYSMAN> set env/clus
%SYSMAN-I-ENV, current command environment:
Clusterwide on local cluster
Username SYSTEM will be used on nonlocal nodes
SYSMAN> io list_wwid
%SYSMAN-I-OUTPUT, command execution on node SYSTM2
On port _SYSTM2$PGA0:, the following tape WWIDs are not yet configured:
Target 8, LUN 1, HP ESL9000 Series
WWID=0C000008:0050-8412-9DA1-0026
Target 8, LUN 2, COMPAQ SDLT320
WWID=02000008:500E-09E0-0009-84D1
Target 8, LUN 3, COMPAQ SDLT320
WWID=02000008:500E-09E0-0009-4E4E
On port _SYSTM2$PGB0:, the following tape WWIDs are not yet configured:
Target 6, LUN 1, HP ESL9000 Series
WWID=0C000008:0050-8412-9DA1-0026
Target 6, LUN 2, COMPAQ SDLT320
WWID=02000008:500E-09E0-0009-84D1
Target 6, LUN 3, COMPAQ SDLT320
WWID=02000008:500E-09E0-0009-4E4E
%SYSMAN-I-OUTPUT, command execution on node SYSTM1
On port _SYSTM1$PGA0:, the following tape WWIDs are not yet configured:
Target 6, LUN 1, HP ESL9000 Series
WWID=0C000008:0050-8412-9DA1-0026
Target 6, LUN 2, COMPAQ SDLT320
WWID=02000008:500E-09E0-0009-84D1
Target 6, LUN 3, COMPAQ SDLT320
WWID=02000008:500E-09E0-0009-4E4E
On port _SYSTM1$PGB0:, the following tape WWIDs are not yet configured:
Target 5, LUN 1, HP ESL9000 Series
WWID=0C000008:0050-8412-9DA1-0026
Target 5, LUN 2, COMPAQ SDLT320
WWID=02000008:500E-09E0-0009-84D1
Target 5, LUN 3, COMPAQ SDLT320
WWID=02000008:500E-09E0-0009-4E4E
%SYSMAN-I-NODERR, error returned from node SYSTM1
-SYSTEM-W-NOMORENODE, no more nodes
SYSMAN>
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The previous NOMORENODE error is normal, because the command has
completed on all existing nodes. Next, still in the same SYSMAN
session, the user executes IO CREATE_WWID to choose device names
$2$GGA40, $2$MGA40, $2$MGA41.
SYSMAN> io create_wwid $2$GGA40/WWID=0C000008:0050-8412-9DA1-0026
%SYSMAN-I-NODERR, error returned from node SYSTM1
-SYSTEM-W-NOMORENODE, no more nodes
SYSMAN> io create_wwid $2$mga40/WWID=02000008:500E-09E0-0009-84D1
%SYSMAN-I-NODERR, error returned from node SYSTM1
-SYSTEM-W-NOMORENODE, no more nodes
SYSMAN> io create_wwid $2$mga41/WWID=02000008:500E-09E0-0009-4E4E
%SYSMAN-I-NODERR, error returned from node SYSTM1
-SYSTEM-W-NOMORENODE, no more nodes
SYSMAN>
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The user now executes IO AUTOCONFIGURE to configure the devices. Note
that both the PGA path and the PGB path are configured for each node.
SYSMAN> io auto/lo
%SYSMAN-I-OUTPUT, command execution on node SYSTM2
%IOGEN-I-PREFIX, searching for ICBM with prefix SYS$
%IOGEN-I-PREFIX, searching for ICBM with prefix DECW$
%IOGEN-I-FIBREPOLL, scanning for devices through FIBRE port PGA0
%IOGEN-I-CONFIGURED, configured device GGA40
%IOGEN-I-CONFIGURED, configured device MGA40
%IOGEN-I-CONFIGURED, configured device MGA41
%IOGEN-I-FIBREPOLL, scanning for devices through FIBRE port PGB0
%IOGEN-I-CONFIGURED, configured device GGA40
%IOGEN-I-CONFIGURED, configured device MGA40
%IOGEN-I-CONFIGURED, configured device MGA41
%SYSMAN-I-OUTPUT, command execution on node SYSTM1
%IOGEN-I-PREFIX, searching for ICBM with prefix SYS$
%IOGEN-I-PREFIX, searching for ICBM with prefix DECW$
%IOGEN-I-FIBREPOLL, scanning for devices through FIBRE port PGA0
%IOGEN-I-CONFIGURED, configured device GGA40
%IOGEN-I-CONFIGURED, configured device MGA40
%IOGEN-I-CONFIGURED, configured device MGA41
%IOGEN-I-FIBREPOLL, scanning for devices through FIBRE port PGB0
%IOGEN-I-CONFIGURED, configured device GGA40
%IOGEN-I-CONFIGURED, configured device MGA40
%IOGEN-I-CONFIGURED, configured device MGA41
%SYSMAN-I-NODERR, error returned from node SYSTM1
-SYSTEM-W-NOMORENODE, no more nodes
SYSMAN> exit
Systm1>
Systm1> sho dev/fu $2$GG
Device $2$GGA40:, device type Generic SCSI device, is online, shareable, device
has multiple I/O paths.
Error count 0 Operations completed 0
Owner process "" Owner UIC [SYSTEM]
Owner process ID 00000000 Dev Prot S:RWPL,O:RWPL,G:RWPL,W:RWPL
Reference count 0 Default buffer size 0
WWID 0C000008:0050-8412-9DA1-0026
I/O paths to device 2
Path PGA0.1000-00E0-0242-86ED (SYSTM1), primary path, current path.
Error count 0 Operations completed 0
Path PGB0.1000-00E0-0222-86ED (SYSTM1).
Error count 0 Operations completed 0
Systm1> sho dev/fu $2$MG
Magtape $2$MGA40: (SYSTM1), device type COMPAQ SDLT320, is online, file-oriented
device, available to cluster, device has multiple I/O paths, error logging
is enabled, device supports fastskip (per_io).
Error count 0 Operations completed 2
Owner process "" Owner UIC [SYSTEM]
Owner process ID 00000000 Dev Prot S:RWPL,O:RWPL,G:R,W
Reference count 0 Default buffer size 2048
WWID 02000008:500E-09E0-0009-84D1
Density default Format Normal-11
Host name "SYSTM1" Host type, avail AlphaServer DS10 466 MHz, yes
Alternate host name "SYSTM2" Alt. type, avail AlphaServer DS10 466 MHz, no
Allocation class 2
Volume status: no-unload on dismount, position lost, odd parity.
I/O paths to device 2
Path PGA0.1000-00E0-0242-86ED (SYSTM1), primary path, current path.
Error count 0 Operations completed 1
Path PGB0.1000-00E0-0222-86ED (SYSTM1).
Error count 0 Operations completed 1
Magtape $2$MGA41: (SYSTM1), device type COMPAQ SDLT320, is online, file-oriented
device, available to cluster, device has multiple I/O paths, error logging
is enabled, device supports fastskip (per_io).
Error count 0 Operations completed 0
Owner process "" Owner UIC [SYSTEM]
Owner process ID 00000000 Dev Prot S:RWPL,O:RWPL,G:R,W
Reference count 0 Default buffer size 2048
WWID 02000008:500E-09E0-0009-4E4E
Density default Format Normal-11
Host name "SYSTM1" Host type, avail AlphaServer DS10 466 MHz, yes
Alternate host name "SYSTM2" Alt. type, avail AlphaServer DS10 466 MHz, no
Allocation class 2
Volume status: no-unload on dismount, position lost, odd parity.
I/O paths to device 2
Path PGA0.1000-00E0-0242-86ED (SYSTM1), primary path, current path.
Error count 0 Operations completed 0
Path PGB0.1000-00E0-0222-86ED (SYSTM1).
Error count 0 Operations completed 0
Systm1>
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