Difference Between HDisk and Hdiskpower:
All the physical
partitions in a volume group are the same size, although different volume
groups can have different PP sizes.
The hdiskpower
devices are logical pointers to hdisks. Hdiskpower are EMC devices created by
EMC software in order provide load balancing and fault tolerance, so and
hdiskpower device is one, two, four hdisks depending on how many paths (FC
Cards) to the EMC controller (switch) your server has.
# lspv
hdisk0 00c32b87a77983ca rootvg active
hdisk1 00cd1fc6f1839e04 rootvg active
hdisk2 none None
hdisk3 00c32b87a77983ca rootvg active
hdisk4 00cd1fc6f1839e04 rootvg active
hdisk5 none None
hdisk6 00c32b87a77983ca rootvg active
hdisk7 00cd1fc6f1839e04 rootvg active
hdisk8 none None
hdisk9 00c32b87a77983ca rootvg active
hdisk10 00cd1fc6f1839e04 rootvg active
hdisk11 none None
hdiskpower0 none None
hdiskpower1 none None
hdiskpower2 00c32b87ad9198ad auq4073lT2P active
#
powermt display
Symmetrix logical device count=3
CLARiiON logical
device count=0
HP xp logical device
count=0
Ess logical device
count=0
Invista logical
device count=0
==============================================================================
----- Host Bus
Adapters --------- ------ I/O Paths
----- ------ Stats ------
### HW Path Summary Total
Dead IO/Sec Q-IOs Errors
==============================================================================
0 fscsi0 optimal 3
0 -
0 0
1 fscsi1 optimal 3
0 - 0
0
2 fscsi2 optimal 3
0 - 0
0
3 fscsi3 optimal 3
0 - 0 0
It says 3 logical device, which
can be seen in lspv command (hdiskpower0/1/2).
Below will show you which hdisks
belong to which hdiskpower and the current path status.
#
powermt display dev=all
Pseudo
name=hdiskpower0
Symmetrix
ID=000492600083
Logical device
ID=4EE0
state=alive;
policy=SymmOpt; priority=0; queued-IOs=0;
==============================================================================
--------------- Host
--------------- - Stor - -- I/O Path -- -- Stats ---
### HW Path I/O Paths Interf.
Mode State Q-IOs Errors
==============================================================================
0 fscsi0 hdisk0 FA
7eB active alive
0 0
1 fscsi1 hdisk3 FA
8eB active alive
0 0
2 fscsi2 hdisk6 FA
9eB active alive
0 0
3 fscsi3 hdisk9 FA 10eB
active alive 0
0
Pseudo
name=hdiskpower1
Symmetrix ID=000492600083
Logical device
ID=4EE4
state=alive;
policy=SymmOpt; priority=0; queued-IOs=0;
==============================================================================
--------------- Host
--------------- - Stor - -- I/O Path -- -- Stats ---
### HW Path I/O Paths Interf.
Mode State Q-IOs Errors
==============================================================================
3 fscsi3 hdisk10 FA 10eB
active alive 0
0
0 fscsi0 hdisk1
FA 7eB active
alive 0 0
1 fscsi1 hdisk4 FA
8eB active alive
0 0
2 fscsi2 hdisk7 FA
9eB active alive
0 0
Pseudo
name=hdiskpower2
Symmetrix ID=000492600083
Logical device
ID=4EE8
state=alive;
policy=SymmOpt; priority=0; queued-IOs=0;
==============================================================================
--------------- Host
--------------- - Stor - -- I/O Path -- -- Stats ---
### HW Path I/O Paths Interf.
Mode State Q-IOs Errors
==============================================================================
3 fscsi3 hdisk11 FA 10eB
active alive 0
0
0 fscsi0 hdisk2 FA
7eB active alive
0 0
1 fscsi1 hdisk5 FA
8eB active alive
0 0
2 fscsi2 hdisk8 FA
9eB active alive
0 0
#
lsdev -Cc disk
hdisk0 Available 41-T1-01 EMC Symmetrix FCP VRAID
hdisk1 Available 41-T1-01 EMC Symmetrix FCP
VRAID
hdisk2 Available 41-T1-01 EMC Symmetrix FCP
VRAID
hdisk3 Available 42-T1-01 EMC Symmetrix FCP
VRAID
hdisk4 Available 42-T1-01 EMC Symmetrix FCP
VRAID
hdisk5 Available 42-T1-01 EMC Symmetrix FCP
VRAID
hdisk6 Available 61-T1-01 EMC Symmetrix FCP
VRAID
hdisk7 Available 61-T1-01 EMC Symmetrix FCP
VRAID
hdisk8 Available 61-T1-01 EMC Symmetrix FCP
VRAID
hdisk9 Available 62-T1-01 EMC Symmetrix FCP
VRAID
hdisk10 Available 62-T1-01 EMC Symmetrix FCP VRAID
hdisk11 Available 62-T1-01 EMC Symmetrix FCP VRAID
hdiskpower0
Available 62-T1-01 PowerPath Device
hdiskpower1
Available 62-T1-01 PowerPath Device
hdiskpower2
Available 62-T1-01 PowerPath Device
$
lspv -M hdisk2
0516-1396 : The
physical volume hdisk2, was not found in the
system database.
lspv
Command
Purpose
Displays information about a physical
volume within a volume group.
Lists the following
fields for each logical volume on the physical volume:
PVname:PPnum
[LVname: LPnum [:Copynum] [PPstate]]
$
lspv -M hdisk0
hdisk0:1 hd5:1
hdisk0:2 hd5:2
hdisk0:3 hd5:3
hdisk0:4 hd5:4
hdisk0:5 bos_hd5:1
hdisk0:6 bos_hd5:2
hdisk0:7 bos_hd5:3
hdisk0:8 bos_hd5:4
hdisk0:9-23
hdisk0:24 dump00:15
hdisk0:25 dump00:16
hdisk0:26 dump00:17
hdisk0:27 aconnect:1
hdisk0:28 aconnect:2
hdisk0:29 aconnect:3
hdisk0:30 aconnect:4
hdisk0:31 aconnect:5
hdisk0:32 aconnect:6
hdisk0:33 aconnect:7
hdisk0:34 aconnect:8
hdisk0:35 dump00:1
$ lsvg
rootvg
auq4073lT2P
$
lsvg -m rootvg
Logical Volume Copy 1 Copy 2 Copy 3
hd5 None None None
hd6 None None None
hd8 None None None
hd4 None None None
hd2 None None None
hd9var None None None
hd3 None None None
hd1 None None None
hd10opt None None None
hd11admin None None None
livedump None None None
hd12audit None
None None
bos_hd5 None None None
osysadm None None None
voperf None None None
actmagent None None None
dump00 None None None
aconnect None None None
bos_hd4 None None None
bos_hd2 None None None
bos_hd9var None None None
bos_hd10opt None None None
$
lsvg -m auq4073lT2P
Logical Volume Copy 1 Copy 2 Copy 3
aihs None None None
aMDM None None None
apatrol None None None
aoraclient None None None
vMDM None None None
aWebSphere None None None
vWebSphere None None None
nmonperf None None None
$ lslv -m hd5
hd5:N/A
LP PP1
PV1 PP2
PV2 PP3 PV3
0001 0001 hdisk9
0002 0002 hdisk9
0003 0003 hdisk9
0004 0004 hdisk9
$
lslv -m voperf
voperf:/var/opt/perf
LP PP1
PV1 PP2 PV2 PP3 PV3
0001 0052 hdisk9
0002 0049 hdisk9
0003 0050 hdisk9
0004 0051 hdisk9
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