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тАО04-02-2010 02:56 PM
тАО04-02-2010 02:56 PM
(Alternate links represent the same Physical volume.)
Please suggest me how to make sure that alternate links are indicating the same disks.
Please suggest on this
Rahul
Solved! Go to Solution.
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тАО04-03-2010 04:31 PM
тАО04-03-2010 04:31 PM
Re: Disk Issue
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тАО04-03-2010 05:35 PM
тАО04-03-2010 05:35 PM
SolutionFirst, set the PV filename:
PVFILE=/dev/rdsk/CTD
This shows the LVMREC on the disk.
dd if=$PVFILE bs=1k skip=8 count=1|xd -xc|head -10
This shows the PVID, the CPUID and the VGID.
xd -An -j8200 -N16 -tx $PVFILE
For the primary and alternate links, the numbers will be identical (they come from the same disk).
Bill Hassell, sysadmin
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тАО04-03-2010 06:45 PM
тАО04-03-2010 06:45 PM
Re: Disk Issue
if you have powermt it would show you which disks are alternate, but then you don need to worry about adding alternate disk in VG.
in cXtXdX for alternate disk normally only cX changes so all disk with sam tXdX are one disk.
eg c1t0d0,c2t0d0,c3t0d0...would be same disk.
if you have huge number of disks then yeh it can be lil headache :)
BR,
Kapil+
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тАО04-03-2010 09:59 PM
тАО04-03-2010 09:59 PM
Re: Disk Issue
In HP-UX11iv3, can use below command to confirm the disks info.
#ioscan -m dsf
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тАО04-04-2010 05:17 AM
тАО04-04-2010 05:17 AM
Re: Disk Issue
In my one box c1t0d0 is primary disk and c2t0d0 is mirror. as per Kapil's relpy c2t0d0 must be link to c1t0d0.
Please suggets on this.
Rahul
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тАО04-04-2010 07:01 AM
тАО04-04-2010 07:01 AM
Re: Disk Issue
this will show persistent and legacy path where you can easily identify alternate path
or if storage is hp
use xpinfo
if emc use powermt display dev=all
Chandra
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тАО04-05-2010 12:32 AM
тАО04-05-2010 12:32 AM
Re: Disk Issue
strings /etc/lvmtab
and do you have powermt display.
which SAN is this, or local disk.
BR,
Kapil+
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тАО04-05-2010 12:36 AM
тАО04-05-2010 12:36 AM
Re: Disk Issue
xd -An -j8200 -N16 -tx /dev/rdsk/cxtcdx
BR,
Kapil+
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тАО04-05-2010 02:15 AM
тАО04-05-2010 02:15 AM
Re: Disk Issue
Draw youre own, IO design of the system and from there draw conclusions, if any disks/luns have more then 1 path.
NOTE: Almost allways, alternate paths/links to a disk/lun will have the same (cX/V/W)tydz device file name, but not necessarily all (cX/V/W)tydz device files will point to the same disk/lun. Which is probably the case in youre situation, c1t0d0 is not an alternate path to c2t0d0 but points to a seperate disk.
For internal disks, crosscheck the ioscan -fn output (for pre HP-UX 11iv3), ioscan -fn/ioscan -fnN/ioscan -fne/ioscan -m dsf (for HP-UX 11iv3), with the IO design that can be found in the hardware guide of the system.
F.e. for a rx7640, the hardware guide can be found via docs.hp.com,
"
HP Integrity rx7640 and HP 9000 rp7440
Servers
User Service Guide
"
http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c01883971/c01883971.pdf
On page 28 the internal disks IOpaths can be found.
with 4 internal disks inserted, 4 paths are listed.
Drive 1-1 - 1/0/0/3/0.6.0
Drive 1-2 - 1/0/1/1/0/4/1.6.0
Drive 0-2 - 0/0/1/1/0/4/1.5.0
Drive 0-1 - 0/0/0/3/0.6.0
And compare this info with the output of ioscan -fn.
titan:/root:model
ia64 hp server rx7640
titan:/root:uname -a
HP-UX titan B.11.31 U ia64 2146251420 unlimited-user license
titan:/root:ioscan -fn|more
[..]
ext_bus 0 1/0/0/3/0 mpt CLAIMED INTERFACE SCSI Ultra32
0
/dev/mpt0
disk 1 1/0/0/3/0.6.0 sdisk CLAIMED DEVICE HP 73.4GST37
3455LC
/dev/dsk/c0t6d0 /dev/rdsk/c0t6d0
[..]
ext_bus 1 1/0/0/3/1 mpt CLAIMED INTERFACE SCSI Ultra32
0
/dev/mpt1
target 1 1/0/0/3/1.2 tgt CLAIMED DEVICE
disk 0 1/0/0/3/1.2.0 sdisk CLAIMED DEVICE Optiarc DVD
RW AD-5170A
/dev/dsk/c1t2d0 /dev/rdsk/c1t2d0
The above host has only access to 1 internal disk, which has only 1 path to the internal disk.
Greetz,
Chris