happened-moony
vxassist
是
VxVM
< br>中非常重要的一个工具
,
使用非常频繁
< br>,
我这里给出一个命令手册
,
并
作了一些简
单的翻译和注释
,
仅供参考
.
General
1.
Creating a Volume
1.1 Creating a
Concatenated V
olume
1.2 Creating a Striped
V
olume
1.3
Creating a RAID-5 V
olume
2. Extending a Volume
2.1
Extending a volume up to certain length
2.2 Extending by a Given Length
3. Shrinking a V
olume
3.1 Shrinking to a Given
Length
3.2 Shrinking by a Given Length
4. Removing a Volume
5.
Mirroring a V
olume
5.1
Creating & Mirroring a New Volume
5.2
Mirroring an Existing V
olume
5.3 Mirroring All Volumes
ng
a Mirror
a RAID-5 Log
a
DRL Log
ng a RAID-5 Log
ing a Volume for Online Backup
ying Volume Configuration Information
General
vxassist<
/p>
工具是
VxVM
中用于进行卷管理的工具
,
可以用于创建卷、增加镜像、扩展或者收缩存
在的卷等
,
是非常重要的一个工具
.
The vxassist utility in Veritas
Volume Manager is used to create volumes, add
mirrors and logs
to existing volumes,
extend and shrink existing volumes, provides for
the migration of data
from a specified
set of disks, and provides facilities for the on-
line backup of existing volumes.
vxassist
在创建卷组时
,
如果不指定
,
缺省的会把卷分配给
rootdg(note:
在
VxVM4.0
中
rootdg
不再必须
,
但是你可以指定一个
default
dg
具有类似的功能
).
vxass
ist
的缺省单位是
blocks,
但
是你可以指定
K
或
M
或
G
为单位
,
这都是合法的
.
The default behavior
of vxassist is to create volumes in the rootdg
diskgroup if
diskgroup is not specified
. The default length is taken as number of blocks
but this
can be specified in Kilobytes
or Megabytes or Gigabytes.
vxassist command syntax :
vxassist
Commonly used
options are given below (See
man
vxassist for complete
list
of supported
options) -g for specifying
diskgroups -b for background operation -d file
containing defaults for
vxassist if not
specified /etc/default/vxassist is used Keywords
used are make , mirror , move ,
growto
,growby ,shrintto ,shirnkby ,snapstart , snapshot
,snapwait Attributes specify volumes
layout disks controllar to include
exclude etc
Device Nodes :
Default
rootdg
disk
group.
Block
Device Node /dev/vx/dsk/volume_name
Raw
Device
Node
/dev/vx/rdsk/volume_name
Other DiskGroups
Block
Device
Node
/dev/vx/dsk/diskgroup_name/volume_name
Raw
Device
Node
/dev/vx/rdsk/diskgroup_name/volume_name
_______________
________________________
1.
Creating a Volume :
1.1
Creating a Concatenated
Volume
缺省的
,vxass
ist
把一个卷组里的所有磁盘统一看待
,
如果创建的
volume
大于单个磁盘
,
那么空间
分配自动的跨越磁盘
.
By default, vxassist creates a
concatenated volume using the space available on a
disk or on
the number of disks in a
diskgroup if the volume size specified is more
then the one available
on a single
disk.
Disks can be specified from a
diskgroup for a volume group but if not mentioned
available
disks are selected by the
volume manager.
Command syntax
:
·
?
vxassist make
volume_name volume_length
To
create a new volume appvol of 100 MB in the
default disk group rootdg with available
disks:
·
?
#vxassist make
appvol 100m
To
create the volume appvol of 100MB on
disk03
·
?
#vxassist make
appvol 100m disk03
1.2
Creating a Striped Volume
A
striped volume contains at least one plex that
consists of two or more subdisks located on
two or more physical disks.
Command Syntax :
·
?
vxassist make
volume_name length layout=stripe
To create a striped volume appvol2 with
the default stripe unit size on the default number
of
disks
·
?
#vxassist make
appvol2 100m layout=stripe
To create a striped volume appvol2
100MB striped volume on three specific
disks.
·
?
#vxassist make
appvol2 100m layout=stripe disk04 disk05
disk06
1.3 Creating a RAID-5
Volume
A RAID-5 volume
contains a RAID-5 plex that consists of two or
more subdisks located on two
or more
physical disks. Only one RAID-5 plex can exist per
volume. A RAID-5 volume may
also
contain one or more RAID-5 log plexes, which are
used to log information about data and
parity being written to the volume.
Command Syntax :
·
?
vxassist make
volume_name length layout=raid5
To create the RAID-5 volume appvol4
with the default stripe unit size on the default
number of
disks with RAID-5
log,
·
?
#vxassist make
appvol4 100m layout=raid5.
2. Extending a Volume--
扩展一个建
好的
Volume
Caution
: If you plan to use
volume size change (grow or shrink ) on a volume
with data make
sure you have the good
backup of the volume available before carrying out
such operation .
2.1 Extending a volume
up to certain length
Command
syntax
·
?
vxassist growto
volume_name length
To extend
vol3 upto 8000 sectors, type:--
例如
,
扩展
vol3
到
8000
个扇区
·
?
#vxassist
growto vol3 8000
Note:
这里可以指定大小
,
例如
:
vxassist growto redo101
100
M
如果使用的是非缺省
DG,
还需要指定磁盘组
:
vxassist -g
oradg
growto redo101 100M
2.2
Extending by a Given Length
Command
Syntax
·
?
vxassist growby
volume_name length
To extend
volapp by 1000 sectors, type:
·
?
#vxassist
growby volapp 1000
3.
Shrinking a Volume
Caution
- Do not shrink a
volume below the size of the file system. If you
have a VxFS file
system, you can shrink
the file system and then shrink the volume. If you
do not shrink the file
system first,
you risk unrecoverable data loss.
Always make sure you have a good backup
of the data volume to be shirnked.
3.1
Shrinking to a Given Length
Shrink a
volume to a specific length as follows:
·
?
vxassist
shrinkto volume_name length
Make sure you do not shrink the volume
below the current size of the file system or
database
using the volume. This command
can be safely used on empty volumes.
To
shrink volcat to 1300 sectors, type:
·
?
#vxassist
shrinkto volcat 1300
3.2
Shrinking by a Given Length
Shrink a volume by a specific length as
follows:
·
?
vxassist
shrinkby volume_name length
To shrink volcat by 8000 sectors,
type:
·
?
#vxassist
shrinkby volapp2 8000
4.
Removing a Volume
Removing
a
volume
requires
removing
all
references
to
the
volumes
to
be
removed
like
unmounting the volume if mounted and
removing its reference from /etc/vfstab .
< br>如果你需要
remove
一个
v
olume,
那么首先你需要
stop
这个卷组
,
停止其上的所有活动事务
.
An active volume has to be stopped
first to stop all the activities to the volume
only then it can
be removed.
Stopping Volume :
Command
Syntax
·
?
vxvol stop
volume_name
To stop
appvol1
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