VERITAS Volumanager Cheat Sheet

7/30/2019 VERITAS Volumanager Cheat Sheet

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Veritas Volume Manager Guide (Basic):

Subdisk:

A subdisk is a set of contiguous disk blocks. A block is a unit of space on the disk. VxVM

allocates diskspace using subdisks. A VM disk can be divided into one or more subdisks.

Plexes:

VxVM uses subdisks to build virtual objects called plexes. A plex consists of one or more

subdisks located on one or more physical disks

Volumes:

A volume is a virtual disk device that appears to applications, databases, and file systems

like a physical disk device

Scan new disks:

# vxdctl -f enable

# vxdisk -f scandisks

Partial device discovery:

devices that were unknown to it earlier:

# vxdisk scandisks new

The next example discovers fabric devices:

# vxdisk scandisks fabric

The following command scans for the devices c1t1d0 and

c2t2d0:

# vxdisk scandisks device=c1t1d0,c2t2d0

Exclude those that are listed:

# vxdisk scandisks !device=c1t1d0,c2t2d0

Manually Initialized

#vxdisk init c1t15d0s6 type=simple


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Display the native OS device:

# vxdisk path | egrep diskname

# vxdisk -e list

Select enclosure-based & operating system-based naming

respectively:# vxddladm set namingscheme=ebn [persistence={yes|no}]

# vxddladm set namingscheme=osn [persistence={yes|no}]

Create Disk Group:

vxdg init group disk=

Adding a new disk to VG:

vxdg g adddisk disk=

Create Volume:

Vmake approach:

Identify disks in disk group dg15 that have enough

free space to create a 13 GB subdisk:# vxdg -g dg1 free

DISK DEVICE TAG OFFSET LENGTH FLAGS

disk1 c1t0d0s2 c1t0d0 35302304 61256 -

disk2 c1t1d0s2 c1t1d0 35302304 61256 -

The LENGTH column displays the number of free sectors on the disk (each sector is 512bytes).

Create the subdisks:

Syntax:

# vxmake sd subdisk diskname,offset,length

Plex one:# vxmake -g dg1 sd sub-01 disk1,0,1g

# vxmake -g dg1 sd sub-02 disk2,0,1g


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Create the three plexes and associate the subdisks

with them.

Syntax:

# vxmake plex plex sd=subdisk1[,subdisk2,...]

Plex one named plex-01:

# vxmake -g dg15 plex plex-01 sd=sub-01,sub-02

Create the volume consisting of the plex.

Creating volume vol-01 composed of plexe plex-01

# vxmake -g -U vol=Plex1[,Plex2,...]

-U

fsgen - filesystems

gen - raw volumes

raid - supports raid5

root - suuports root filesystems for booting

swap - performs no recovery on startup

relayout - used temporary for disk relayout operations

# vxmake -g dg15 -U fsgen vol vol-01 plex=Plex1

Initialize the volume.

# vxvol start vol-01

Vxassist Approach:

# vxassist make layout=[stripe-mirror|concat-mirror|mirror-

concat|mirror-stripe]

#vxassist -g make

Dynamic LUN expansion:

Current Size of volume:

vxprint -g -u

Extend file system:

#vxassist -g growby

#vxassist -g growto

# vxassist -g maxgrow


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Removal of the disk from system:

Remove Disk:

OS disk VS Veritas disk:

# vxdisk -e list

Identify the dg name from the disk:

#vxdisk list

Find all volumes in the dg:

#vxprint -g -u

Stop all volumes in the dg run the same one by one for

volume:

#vxvol -g stop

Remove the volume Double check the right one or data

will be lost:

#vxassist -g remove volume

Remove a particular disk

#vxdg -g rmdisk

Destroy Disk Group:#vxdg destroy

Remove disk form Veritas Control

#vxdisk rm

Depot a group:

vxdg deport

Import group (clear any flags):

vxdg import -C


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Regenerating persistent device names:

# vxdmpadm getsubpaths dmpnodename=disk_access_name

# vxdisk list disk_access_name

Remove the file that contains the existing persistent device name database:

# rm /etc/vx/disk.info

Restart the VxVM configuration demon:# vxconfigd -k

This regenerates the persistent name database

VERITAS Volumanager Cheat Sheet

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