VMAX FE port change and impact on LUN paths

lufc — Fri, 26 Jan 2018 11:42:38 GMT

Running HPUX B.11.31, we are currently connected to customer SAN via 2 x HBA cards and have 4 paths to 4 LUNS. Customer has advised us that they are going to change 2 of the FE ports. I am concerned that this will lose 2 paths for every LUN and we will have to recreate these but I have also read that HPUX B.11.31 using agile paths, this will sort itself out. Below are the outputs of various commands. Wondering if anyone could shed some light on this and outline what we would have to do to recreate the paths if half of them disappear after the FE port change?

ioscan -funC disk

Class     I H/W Path     Driver S/W State   H/W Type     Description
=====================================================================
disk     19 0/3/0/0/0/0.23.11.0.0.0.1          sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c13t0d1   /dev/rdsk/c13t0d1
disk     20 0/3/0/0/0/0.23.11.0.0.0.2          sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c13t0d2   /dev/rdsk/c13t0d2
disk     21 0/3/0/0/0/0.23.11.0.0.0.3          sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c13t0d3   /dev/rdsk/c13t0d3
disk     41 0/3/0/0/0/0.23.11.0.0.0.4          sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c13t0d4   /dev/rdsk/c13t0d4
disk     22 0/3/0/0/0/0.23.20.0.0.0.1          sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c15t0d1   /dev/rdsk/c15t0d1
disk     23 0/3/0/0/0/0.23.20.0.0.0.2          sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c15t0d2   /dev/rdsk/c15t0d2
disk     24 0/3/0/0/0/0.23.20.0.0.0.3          sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c15t0d3   /dev/rdsk/c15t0d3
disk     42 0/3/0/0/0/0.23.20.0.0.0.4          sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c15t0d4   /dev/rdsk/c15t0d4
disk     25 0/6/0/0/0/0/2/0/0/0.24.9.0.0.0.1   sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c17t0d1   /dev/rdsk/c17t0d1
disk     26 0/6/0/0/0/0/2/0/0/0.24.9.0.0.0.2   sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c17t0d2   /dev/rdsk/c17t0d2
disk     27 0/6/0/0/0/0/2/0/0/0.24.9.0.0.0.3   sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c17t0d3   /dev/rdsk/c17t0d3
disk     38 0/6/0/0/0/0/2/0/0/0.24.9.0.0.0.4   sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c17t0d4   /dev/rdsk/c17t0d4
disk     28 0/6/0/0/0/0/2/0/0/0.24.23.0.0.0.1 sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c19t0d1   /dev/rdsk/c19t0d1
disk     29 0/6/0/0/0/0/2/0/0/0.24.23.0.0.0.2 sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c19t0d2   /dev/rdsk/c19t0d2
disk     30 0/6/0/0/0/0/2/0/0/0.24.23.0.0.0.3 sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c19t0d3   /dev/rdsk/c19t0d3
disk     39 0/6/0/0/0/0/2/0/0/0.24.23.0.0.0.4 sdisk   CLAIMED     DEVICE       EMC     SYMMETRIX
                         /dev/dsk/c19t0d4   /dev/rdsk/c19t0d4
disk      0 0/6/0/0/0/0/4/0/0/0.0.0            sdisk   CLAIMED     DEVICE       HP      LOGICAL VOLUME
                         /dev/dsk/c2t0d0     /dev/dsk/c2t0d0s3   /dev/rdsk/c2t0d0s2
                         /dev/dsk/c2t0d0s1   /dev/rdsk/c2t0d0    /dev/rdsk/c2t0d0s3
                         /dev/dsk/c2t0d0s2   /dev/rdsk/c2t0d0s1
disk      2 255/1/0.0.0 sdisk   CLAIMED     DEVICE       TEAC    DVD-ROM DW-224EV
                         /dev/dsk/c3t0d0   /dev/rdsk/c3t0d0

root@dr:/dev> fcmsutil /dev/fcd0

                           Vendor ID is = 0x1077
                           Device ID is = 0x2532
            PCI Sub-system Vendor ID is = 0x103C
                   PCI Sub-system ID is = 0x3262
                               PCI Mode = PCI Express x8
                       ISP Code version = 5.4.4
                       ISP Chip version = 2
                               Topology = PTTOPT_FABRIC
                             Link Speed = 4Gb
                     Local N_Port_id is = 0x179e00
                  Previous N_Port_id is = 0x189e00
            N_Port Node World Wide Name = 0x500143801209d579
            N_Port Port World Wide Name = 0x500143801209d578
            Switch Port World Wide Name = 0x209e00051e363342
            Switch Node World Wide Name = 0x100000051e363342
              N_Port Symbolic Port Name = ccslivdr_fcd0
              N_Port Symbolic Node Name = ccslivdr_HP-UX_B.11.31
                           Driver state = ONLINE
                       Hardware Path is = 0/3/0/0/0/0
                     Maximum Frame Size = 2048
         Driver-Firmware Dump Available = NO
         Driver-Firmware Dump Timestamp = N/A
                                   TYPE = PFC
                         NPIV Supported = YES
                         Driver Version = @(#) fcd B.11.31.1203%372 Jan 7 2012

root@dr:/dev> fcmsutil /dev/fcd1

                           Vendor ID is = 0x1077
                           Device ID is = 0x2532
            PCI Sub-system Vendor ID is = 0x103C
                   PCI Sub-system ID is = 0x3262
                               PCI Mode = PCI Express x8
                       ISP Code version = 5.4.4
                       ISP Chip version = 2
                               Topology = PTTOPT_FABRIC
                             Link Speed = 4Gb
                     Local N_Port_id is = 0x189e00
                  Previous N_Port_id is = 0x179e00
            N_Port Node World Wide Name = 0x500143801209d561
            N_Port Port World Wide Name = 0x500143801209d560
            Switch Port World Wide Name = 0x209e00051e363002
            Switch Node World Wide Name = 0x100000051e363002
              N_Port Symbolic Port Name = ccslivdr_fcd1
              N_Port Symbolic Node Name = ccslivdr_HP-UX_B.11.31
                           Driver state = ONLINE
                       Hardware Path is = 0/6/0/0/0/0/2/0/0/0
                     Maximum Frame Size = 2048
         Driver-Firmware Dump Available = NO
         Driver-Firmware Dump Timestamp = N/A
                                   TYPE = PFC
                         NPIV Supported = YES
                         Driver Version = @(#) fcd B.11.31.1203%372 Jan 7 2012

root@dr:/dev> vgexport -s -p -v -m vg01.mapfile /dev/vg01 - 1Tb /cncop_data /cncop_recov
Beginning the export process on Volume Group "/dev/vg01".
/dev/dsk/c15t0d3
/dev/dsk/c13t0d3
/dev/dsk/c17t0d3
/dev/dsk/c19t0d3
vgexport: Preview of vgexport on volume group "/dev/vg01" succeeded.

root@ccslivdr:/dev> vgexport -s -p -v -m vg03.mapfile /dev/vg03 - 512Gb /backup /shared /oracel_diag /RMAN_backups
Beginning the export process on Volume Group "/dev/vg03".
/dev/dsk/c15t0d2
/dev/dsk/c13t0d2
/dev/dsk/c17t0d2
/dev/dsk/c19t0d2
vgexport: Preview of vgexport on volume group "/dev/vg03" succeeded.

root@ccslivdr:/dev> vgexport -s -p -v -m vg05.mapfile /dev/vg05 - 128Gb /trn_recov /trn_data /trn_oracle_diag /trn_RMAN_backups /trn_backup
Beginning the export process on Volume Group "/dev/vg05".
/dev/dsk/c15t0d1
/dev/dsk/c13t0d1
/dev/dsk/c17t0d1
/dev/dsk/c19t0d1
vgexport: Preview of vgexport on volume group "/dev/vg05" succeeded.

root@ccslivdr:/dev> vgexport -s -p -v -m vg07.mapfile /dev/vg07 - 300Gb /archive
Beginning the export process on Volume Group "/dev/vg07".
/dev/dsk/c17t0d4
/dev/dsk/c19t0d4
/dev/dsk/c13t0d4
/dev/dsk/c15t0d4
vgexport: Preview of vgexport on volume group "/dev/vg07" succeeded.

Re: VMAX FE port change and impact on LUN paths

Bhagw_p — Wed, 31 Jan 2018 06:56:50 GMT

Hello Lufc,

Greetings !!!

As I understand that, you are not using agile DSF. Hence, there might be chances of losing the path if there are any changes in the SAN / Switch.

1) convert the legacy DSF to agile -

# vgdsf -c vg01

2) The path to the above command is /usr/contrib/bin/vgdsf

3) Perform the above command for all the VGs.

4) Take the back up of map files and verify if it has the agile DSF.

# vgexport -p -v -s -m /tmp/vg01.map /dev/vg01

5) While restoring from the map files use -N for agile DSF.

# vgimport -v -s -N -m /tmp/vg01.map /dev/vg01

6) Having map files before and after SAN changes will help us in restoring the VG, if there are any surprises while performing SAN changes.

7) Apart from map files, please take the backup of /etc/lvmtab, /etc/lvmtab_p and /etc/lvmconf

Hope this helps.

Re: VMAX FE port change and impact on LUN paths

lufc — Wed, 07 Feb 2018 10:29:48 GMT

Hi
 
Thanks for your response - one issue I have is that we have a 2 node active/passive cluster and a DR server.  In a DR scenario we shut down the cluster and then after the SAN LUNs have been moved to the DR site we would activate the volume groups on the DR server.
Currently the cluster is active and it seems that to run the vgdsf command on the DR server would need the vgchange -a y command executed for every volume group on the DR server, but as these volume groups are already active on the active cluster node what would be the impact of making them active on the DR server even for a short time?
 
Found that vgchange -a r does not allow vgdsf to work. After speaking to SAN team they informed that the LUNa assigned in read only mode so went ahead with the vgdsf. Port changes happen early Tuesday morning so will check after that.

Teh port changes were made and as expect 8 of the paths were showing NO_HW. I ran ioscan and this created 4 new devices. I ran ioscan again but the missing 4 devices never appeared. I rebooted the server and the 4 new devices appeared and all the old devices showing as NO_HW disappeared.

I activated teh volume groups in read-only mode and confirmed the size and configuation of each one agaisnt those activated on the live server and all looked OK.

Is this what would be expected? Is there anythng else I would need to do? We are due to failover to this server on 8th to enable Brocade switch changes on the live site to take place.

 
Thanks

topic VMAX FE port change and impact on LUN paths in Operating System - HP-UX

VMAX FE port change and impact on LUN paths

Re: VMAX FE port change and impact on LUN paths

Re: VMAX FE port change and impact on LUN paths