Cluster Configuration Repository (CCR)
One node is to specific global services. All other nodes communicate with the global services (devices, filesystems)
via the Cluster interconnect.
Global Naming (DID Devices)
/dev/did/dsk and /dev/did/rdsk
DID used only for naming globally — not access
DID device names cannot/are not used in VxVM
DID device names are used in Sun/Solaris Volume Manager
provide global access to devices irrespective of there physical location.
most commonly SDS/SVM/VxVM devices are used as global devices. LVM software is unaware of the
implementation of global nature on these devices.
nodeID is an integer representing the node in the cluster
# mount -o global, logging /dev/vx/dsk/nfsdg/vol01 /global/nfs
or edit the /etc/vfstab file to contain the following:
/dev/vx/dsk/nfsdg/vol01 /dev/vx/rdsk/nfsdg/vol01 /global/nfs ufs 2 yes global,logging
Global Filesystem is also known as (aka) Cluster Filesystem (CFS) or PxFS (Proxy File system)
Local failover filesystems (i.e. directly attached to a storage device) cannot be used for scalable services — one
would have to use global filesystems for it.
There are three wariants of the cluster console software:
cconsole (access the node consoles through the TC or other remote console access method)
crlogin (uses rlogin as underlying transport)
ctelnet (uses telnet as underlying transport)
Cluster Control Panel
/opt/SUNWcluster/bin/ccp [ clustername ] &
All necessary info for cluster admin is stored in the following two files:
/etc/clusters e.g. sc-cluster sc-node1 sc-node2
sc-node1 sc-tc 5002 # Connect via TCP port on TC
sc-node2 sc-tc 5003
sc-10knode1 sc10k-ssp 23 # connect via E10K SSP
sc-10knode2 sc10k-ssp 23
sc-15knode1 sf15k-mainsc 23 # Connect via 15K Main SC
e250node1 RSCIPnode1 23 # Connect via LAN RSC on a E250
node1 sc-tp-ws 23 # Connect via a tip launchpad
sf1_node1 sf1_mainsc 5001 # Connect via passthru on midframe
Sun Cluster Set up
Don’t mix PCI and SBus SCSI devices
Quorum Device Rules
A quorum device must be available to both nodes in a 2-node cluster
quorum device info is maintained globally in the CCR db
quorum device should contain user data
Max and optimal number of votes contributed by quorum devices must be N -1 (where N == number of nodes
in the cluster)
If # of quorum devices >= # of nodes, Cluster cannot come up easily if there are too many failed/errored
quorum devices are not required in clusters with more than 2 nodes, but recommended for higher cluster
quorum devices are manually configured after Sun Cluster s/w installation is done
quorum devices are configured using DID devices
Quorum Math and Consequences
A running cluster is always aware of (Math):
Total possible Q votes (number of nodes + disk quorum votes)
Total present Q votes (number of booted nodes + available quorum device votes) –> Total needed Q votes (
>= 50% of possible votes)
Node that cannot find adequate Q votes will freeze, waiting for other nodes to join the cluster
Node that is booted in the cluster but can no longer find the needed number of votes kernel panics
installmode Flag — allows for cluster nodes to be rebooted after/during initial installation without causing the other
(active) node(s) to panic.
Cluster status Reporting the cluster membership and quorum vote information
# /usr/cluster/bin/scstat –q
Verifying cluster configuration info
# scconf –p
Run scsetup to correct any configuration mistakes and/or to:
add or remove quorum disks
add, remove, enable, disable cluster transport components
register/unregister vxVM device groups
add/remove node access from a VxVM device group
change clsuter private host names
change cluster name
Shuting down cluster on all nodes
# scshutdown -y -g 15
# scstat #verifies cluster status
lahirdx@aescib1:/home/../lahirdx > ps -ef|grep cluster|grep -v grep
root 4 0 0 May 07 ? 352:39 cluster
root 111 1 0 May 07 ? 0:00 /usr/cluster/lib/sc/qd_userd
root 120 1 0 May 07 ? 0:00 /usr/cluster/lib/sc/failfastd
root 123 1 0 May 07 ? 0:00 /usr/cluster/lib/sc/clexecd
root 124 123 0 May 07 ? 0:00 /usr/cluster/lib/sc/clexecd
root 1183 1 0 May 07 ? 46:45 /usr/cluster/lib/sc/rgmd
root 1154 1 0 May 07 ? 0:07 /usr/cluster/lib/sc/rpc.fed
root 1125 1 0 May 07 ? 23:49 /usr/cluster/lib/sc/sparcv9/rpc.pmfd
root 1153 1 0 May 07 ? 0:03 /usr/cluster/lib/sc/cl_eventd
root 1152 1 0 May 07 ? 0:04 /usr/cluster/lib/sc/cl_eventlogd
root 1336 1 0 May 07 ? 2:17 /var/cluster/spm/bin/scguieventd -d
root 1174 1 0 May 07 ? 0:03 /usr/cluster/bin/pnmd
root 1330 1 0 May 07 ? 0:01 /usr/cluster/lib/sc/scdpmd
root 1339 1 0 May 07 ? 0:00 /usr/cluster/lib/sc/cl_ccrad
FF Panic rule — failfast will shutdown the node (panic the kernel) if specified daemon is not restarted within
cluster — System proc created by the kernel to encap kernel threads that make up the core kernel range of
operations. It directly panics the kernel if it’s sent a KILL signal (SIGKILL). Other signals have no effect.
clexecd — This is used by cluster kernel threads to execute userland cmds (such as run_reserve and dofsck
cmds). It is also used to run cluster cmds remotely (eg: scshutdown).A failfast driver panics the kernel if this daemon
is killed and not restarted in 30 seconds.
cl_eventd — This daemon registers and forwards cluster events s(eg: nodes entering and leaving the cluster). With
a min of SC 3.1 10/03, user apps can register themselves to receive cluster events. The daemon automatically gets
respawned by rpc.pmfd if it is killed.
rgmd — This is the resource group mgr, which manages the state of all cluster-unaware applications. A failfast driver
panics the kernel if this daemon is killed by not started in 30 seconds.
rpc.fed — This is the “fork-and-exec” daemon, which handles reqs from rgmd to spawn methods for specific data
services. failfast will hose the box if this is killed and not restarted in 30 seconds.
scguieventd — This daemon processes cluster events for the SunPlex or Sun Cluster Mgr GUI, so that the display
can be updated in real time. It’s not automatically started if it stops. If you are having trouble with SunPlex or Sun
Cluster Mgr, might have to restart the daemon or reboot the specific node.
rpc.pmfd — This is the process monitoring facility. It is i used as a general mech to initiate restarts and failure
action scripts for some cluster f/w daemons, and for most app daemons and app fault monitors. FF panic rule holds
pnmd — This is the public Network mgt daemon, and manages n/w status info received from the local IPMP
(in.mpathd) running on each node in the cluster. It is automatically restarted by rpc.pmfd if it dies.
scdpmd — multi-threaded DPM daemon runs on each node. DPM daemon is started by an rc script when a node
boots. It montiors the availability of logical path that is visible thru various multipath drivers (MPxIO), HDLM,
Powerpath, etc. Automatically restarted by rpc.pmfd if it dies.
Validating basic cluster config
The sccheck (/usr/cluster/bin/sccheck) cmd validates the cluster configuration:
/var/cluster/sccheck is the repository where it stores the reports generated.
Disk Path Monitoring
scdpm -p all:all prints all disk paths in the cluster and their status
scinstall -pv checks the cluster installation status — package revisions, patches applied, etc.
Cluster release file: /etc/cluster/release
Shuting down cluster
scshutdown -y -g 30
Booting nodes in non-cluster mode
Placing node in maintenance mode
scconf -c -q node=,maintstate
Reset the maintenance mode by rebooting the node or running
scconf -c -q reset By placing a node in a cluster in maintenance mode, we reduce the number of reqd. quorum
votes and ensure that cluster operation is not disrupted as a result thereof).
Sunplex or Sun Cluster Manager is available on https\:\:3000.
VxVM Rootdg requirements for Sun Cluster
vxio major number has to be identical on all nodes of the cluster (check for vxio entry in /etc/name_to_major)
vxvm installed on all nodes physically connected to shared storage — on non-storage nodes, yvxvm can be used to
encapsulate and mirror the boot disk. If not using VxVM on a non-storage node, use SVM. All is required in such a
case is the vxio major number be identical to all other nodes of the cluster (add an entry in /etc/name_to_major
VxVM license is reqd. on all nodes not connected to a A5x00 StorEdge array.
Std rootdg created on all nodes where vxVM is installed. Options to initialize rootdg on each node are:
Encap boot disk so it can be mirroered. Preserve all data and creating volumes inside rootdg to encap
If disk has more than 5 slices on it, it cannot be encap’ed.
Initialize other local disks into rootdg.
Unique volume name and minor number across the nodes for the /global/.devices/node@# file system if
the boot disk is encap’ed — the /global/.devices/node@# file system must be on devices with a unique name
each node, because it’s mounted on each node for the same reason. The normal Solaris OS /etc/mnttab logic
redates global fs and still demands that each device have a unique major/minor number. VxVM doesn’t support
changing minor numbers of individual volumes. The entire disk group has to be re-minored.
Use the following command:
# vxdg [ -g diskgroup ] [ -f ] reminor [diskgroup ] new-base-minor
From the vxdg man pages:
reminor Changes the base minor number for a disk group, and renumbers all devices in
the disk group to a range starting at that number. If the device for a volume is open,
then the old device number remains in effect until the system is rebooted or until the
disk group is deported and re-imported.
Also, if you close an open volume, then the user can execute vxdg reminor again to
cause the renumbering to take effect without rebooting or reimporting.
A new device number may also overlap with a temporary renumbering for a volume device.
This also requires a reboot or reimport for the new device numbering to take effect. A
temporary renumbering can happen in the following situations:
when two volumes (for example, volumes in two different disk groups) share the same
permanently assigned device number, in which case one of the volumes is renumbered
temporarily to use an alternate device number;
or when the persistent device number for a volume was changed, but the active device
number could not be changed to match.
The active number may be left unchanged after a persistent device number change either
because the volume device was open, or because the new number was in use as the active
device number for another volume.
vxdg fails if you try to use a range of numbers that is currently in use as a
persistent (not a temporary) device number. You can force use of the number range with
use of the -f option. With -f, some device renumberings may not take effect until a
reboot or a re-import (just as with open volumes). Also, if you force volumes in two
disk groups to use the same device number, then one of the volumes is temporarily
renumbered on the next reboot. Which volume device is renumbered should be considered
random, except that device numberings in the rootdg disk group take precedence over
The -f option should be used only when swapping the device number ranges used by two or
more disk groups. To swap the number ranges for two disk groups, you would use -f when
renumbering the first disk group to use the range of the second disk group. Renumbering
the second disk group to the first range does not require the use of -f.
Sun Cluster does not work with Veritas DMP. DMP can be disabled before installing the software by putting in
dummy symlinks, etc.
scvxinstall is a shell script that automates VxVM installation in a Sun Clustered environment
scvxinstall automates the following things:
tries to disable DMP (vxdmp)
installs correct cluster package
automatically negotiates a vxio major number and properly edits /etc/name_to_major
automates rootdg initialization process and encapsulates boot disk
gives different device names for the /global/.devices/node@# volumes on each side
edits the vfstab properly for this same volume. The problem is this particular line has DID device on it,
and VxVM doesn’t understand DID devices.
installs a script to “reminor” the rootdg on the reboot
reboots the node so that VxVM operates properly
Displays existing device group resources in the Cluster
Registering VxVM device groups
scconf -a -D type=vxvm,name=. \
nodelist should contain only nodes that are physically connected to the disks of that device group.
preferenced=true/false affects whether nodelist indiciates an order of failover preference. On a two-node
cluster, this options is only meaningful if failback is enabled.
failback=disabled/enabled affects whether a preferred node “takes back” its device group when it joins the
cluster. The default value is disabled. When faileback is disabled, preferenced is set to false. If it is enabled,
preferenced also must be set to true.
Moving device groups across nodes of a cluster
When VxVM device groups are registered as Sun Cluster resources, NEVER USE vxdg import/deport commands to
change ownership (node-wise) of the device group. This will cause Sun Cluster to treat device group as failed
Use the following command instead:
# scswitch -z -D -h
Resyncing device groups
scconf -c -D name=,sync
Changing device group configuration
scconf -c -D name=,preferenced=,failback=
scswitch -m -D
all volumes in the device group must be unopened or unmounted (not being used) in order to do that.
To come back out of maintenance mode
scswitch -z -D -h
Repairing DID device database after replacing JBOD disks
Make sure you know which disk to update …
scdidadm -l c1t1d0
returns node1:/dev/rdsk/c1t1d0 /dev/did/rdsk/d7
scdidadm -l d7
returns node1:/dev/rdsk/c1t1d0 /dev/did/rdsk/d7
Then use following cmds to update and verify the DID info:
scdidadm -R d7
scdidadm -l -o diskid d7
returns a large string with disk id.
Replacing a failed disk in a A5200 Array (similar concept with other FC disk arrays)
vxdisk list #get the failed disk name
vxprint -g dgname #determine state of the volume(s) that might be affected
On the hosting node, replace the failed disk:
luxadm remove enclosure,position
luxadm insert enclosure,position
On either node of the cluster (that hosts the device group):
scdidadm -l c#t#d#
scdidadm -R d#
On the hosting node:
vxdiskadm #replace failed disk in vxvm
vxtask list #ensure that resyncing is completed
Remove any relocated submirrors/plexes (if hot-relocation had to move something out of the way):
Solaris Vol Mgr (SDS) in Sun Clustered Env
Preferred method of using Soft partitions is to use single slices to create mirrors and then create volumes (soft
partitions) from that (kind of similar to VxVM public region in an initialized disk).
Shared Disksets and Local Disksets
Only disks that are physically located in the multi-ported storage will be members of shared disksets. Only disks that
are in the same diskset operate as a unit; they can be used together to build mirrored volumes, and primary ownership
of the diskset transfers as a while from node to node.
Boot disks are the local disksets. This is a pre-requisite in order to have shared disksets.
Add local replicas manually.
Put local state db replicas on slice 7 of disks (as a convention) in order to maintain uniformity. Shared disksets
have to have replicas on slice 7.
Spread local replicas evenly across disks and controllers.
Support for Shared disksets is provided by Pkg SUNWmdm
nmd \=\= max num of volumes (default 128)
md_nsets \=\= max is 32, default 4.
Creating shared disksets and mediators
scdidadm -l c1t3d0
Returns d17 as DID device
scdidadm -l d17
metaset -s -a -h # creates metaset
metaset -s -a -m # creates mediator
metaset -s -s /dev/did/rdsk/d9 /dev/did/rdsk/d17
metaset # returns values
medstat -s # reports mediator status
Remaining syntax vis-a-vis Sun Cluster is identical to that for VxVM.
IPMP and Sun Cluster
IPMP is cluster un-aware. To work around that, Sun Cluster uses Cluster-specific public network mgr daemon (pnmd)
to integrate IPMP into the cluster. pmnd daemon has two capabilities:
populate CCR with public network adapter status
facilitate application failover
When pnmd detects all members of a local IPMP group have failed, it consults a file called
/var/cluster/run/pnm_callbacks. This file contains entries that would have been created by the activation of
LogicalHostname and SharedAddress resources. It is the job of hafoip_ipmp_callback to device whether
to migrate resources to another node.
scstat -i #view IPMP configuration
file systems (to failover, local file system must reside on global device
groups with affinity switchovers enabled)
Data Service Agent — is a specially written software that allows a data service in a cluster to operate properly.
Data Service Agent (or Agent) does the following to a standard application:
stops/starts an application
provides a registration information file that allows Sun Cluster to store all the info about the methods
Sun Cluster 2.x runs Fault Monitoring components on failover node, and can initiate a takeover. On Cluster 3.x
software, it is not allowed. Monitor can either monitor to restart or failover on primary (active host) node.
Failover resource groups:
Logical host resource — SUNW.Logicalhostname Data Storage Resource — SUNW.HAStoragePlus NFS resource —
Shutdown a resource group
scswitch -F -g
Turn on a resource group
scswitch -Z -g
Switch a failover group over to another node
scswitch -z -g -h
Restart a resource group
scswitch -R -h -g
Evacuate all resources and rgs from a node
scswitch -S -h node
Disable a res and its fault monitor
scswitch -n -j
Enable a resource and it’s fault monitor
scswitch -e -j
Clear the STOP_FAILED flag
scswitch -c -j -h -f STOP_FAILED
How to add a diskgroup and volume to Cluster configuration
Create the disk group and volume.
- Register the local disk group with the cluster.
root@aesnsra1:../ # scconf -a -D type=vxvm,name=patroldg2,nodelist=aesnsra2
root@aesnsra2:../ # scswitch -z -h aesnsra2 -D patroldg2
- Create your file system.
- Update /etc/vfstab to change ‘-‘ boot options
/dev/vx/dsk/patroldg2/patroldg02 /dev/vx/rdsk/patroldg2/patroldg02 \
/patrol02 vxfs 3 no suid
- Set up a resource group with a HAStoragePlus resource for local filesystem:
root@aesnsra2:../ # scrgadm -a -g aescib1-hastp-rg -h aescib1
root@aesnsra2:../ # scrgadm -a -g aescib1-hastp-rg -j sapmntdg01-rs \
-t SUNW.HAStoragePlus -x FilesystemMountPoints=/sapmnt
- Bring the resource group online which will mount the specified filesystem:
root@aesnsra2:../ # scswitch -Z -g hastp-aesnsra2-rg
- Enable resource.
root@aesnsra2:../# scswitch -e -j osdumps-dev-rs
- (Optional) Reboot and test.
Fault monitor operations
Disable the fault monitor for a resource
scswitch -n -M -j
Enable the fault monitor for a resource
scswitch -e -M -j
scstat -g #shows status of all resource groups
Using scrgadm to register and configure Data service software
scrgadm -a -t SUNW.nfs
scrgadm -a -t SUNW.HAStoragePlus
Create a failover resource
scrgadm -a -f nfs-rg -h node1,node2 -y Pathprefix=/global/nfs/admin
Add logical host name resource to resource group
scrgadm -a -L -g nfs-rg -l clustername-nfs
Create a HAStoragePlus resource
scrgadm -a -j nfs-stor -g nfs-rg *-t SUNW.HAStoragePlus* \
-x FilesystemMountpoints=/global/nfs -x AffinityOn=True
Create SUNW.nfs resource
scrgadm -a -j nfs-res -g nfs-rg -t SUNW.nfs -y Resource_dependencies=nfs-stor
Print the various resource/resource group dependencies via scrgadm
scrgadm -pvv|grep -i depend #And then parse this output
Enable resource and resource monitors, manage resource group and switch resource group to online state
scswitch -Z -f nfs-rg
Show current resource group configuration
scrgadm -p[v[v]] [ -t resource_type_name ] [ -g resgrpname ] [ -j resname ]
Resizing a VxVM/VxFS vol/fs under Sun Cluster
# vxassist -g aesnfsp growby saptrans 5g
# scconf -c -D name=aesnfsp,sync
root@aesrva1:../ # vxprint -g aesnfsp -v saptrans
TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0
v saptrans fsgen ENABLED 188743680 – ACTIVE – –
root@aesrva1:../ # fsadm -F vxfs -b 188743680 /saptrans
UX:vxfs fsadm: INFO: /dev/vx/rdsk/aesnfsp/saptrans is currently 178257920 sector
s – size will be increased
# root@aesrva1:../ # scconf -c -D name=aesnfsp,sync
Command Quick Reference
Sun Terminal Concentrator (Annex NTS)
Enable setup mode by pressing TC test button until TC power indicator starts to blink rapidly, then release the button
and press it briefly. On entering the Setup mode, a monitor: prompt is displayed.
Set up IP address using:
Setting up Load source:
Telnet into the TC IP address:
Elevate to privileged acct using su
Run admin at the TC OS prompt:
get admin: subprompt:
show port=1 type mode
set port= type mode #Choose various options
quit (to exit the boot prompt)