Data Migration

[paabhi]

Hi Team,

We are planning to do a h/w refresh for our customer.The existing servers are running with 11.00 &11.11.The new servers are planning for itanium+hp-ux 11.31.

The data migration procedure we are planning is to establish Timefinder relationship(Cloning) of new LUNs with existing LUNs.Then will split the clone and will import the VGs using new LUNs on the new server.

We observed that the vxfs versions are different across the platforms.

hp-ux 11.31
-----------

fstyp -v /dev/vg00/lvol5
vxfs
version: 6
f_bsize: 8192

hp-ux 11.11
---------

pbrun fstyp -v /dev/vg00/lvol6
vxfs
version: 4

hp-ux 11.00
-----------
fstyp -v /dev/vg00/lvol6
vxfs
version: 3
f_bsize: 8192

Since the 11.00 &11.11 are running with vxfs version 3 &4 , will it be an issue while we import the cloned disks on 11.31 server which is having vxfs version 6.

Anybody came across this scenario.Please help

Abhilash

[Roopesh Francis_1]

yes..this will be an issue however you can try to convert those file systems using vxfsconvert but i am not pretty sure will it work for vxfs 3 to vxfs 6.
We have did it for several times in 11.11 to 11.23 migrations.

One more thing..11.31 has new LVM-2 functionality but you can not use them as you are migrating old VG structure to new systems.

If the data size is not much,why dont you go for back up and restore as you already got two set of disks.

Thanks

[paabhi]

Hi Roopesh,

Thanks for your reply.Our data size is tooo large and we have limited downtime.So we are opting for this method.

[Alzhy]

Abhi,

You should be able to import and mount both your 11.0 and 11.11 storage on HP-UX 11.31. If your 11.31 env is the latest OEUR -- then vxfs should be at 5.0 or Fileystem version 7.

vxfsconvert supports ONLY layouts 2 and 3 and the target layout is 7. Your existing 4 in 11.11 should have no problems mounting.

HTH.

[Alzhy]

The following is a filesystem migrated over from 11.11

root@hpsrv31 # fstyp -v /dev/vx/rdsk/studg1/dskstag1
vxfs
version: 4
f_bsize: 8192
f_frsize: 8192
f_blocks: 65535616
f_bfree: 29115189
f_bavail: 28887727
f_files: 7280352
f_ffree: 7278784
f_favail: 7278784
f_fsid: 2217469512
f_basetype: vxfs
f_namemax: 254
f_magic: a501fcf5
f_featurebits: 0
f_flag: 16
f_fsindex: 10
f_size: 65535616

The following is a new native 11.31 Filesystem:

root@hpsrv31 # fstyp -v /dev/vx/rdsk/unixdg/homes
vxfs
version: 7
f_bsize: 8192
f_frsize: 8192
f_blocks: 13107200
f_bfree: 4964772
f_bavail: 4925985
f_files: 1295488
f_ffree: 1241184
f_favail: 1241184
f_fsid: 2214638512
f_basetype: vxfs
f_namemax: 254
f_magic: a501fcf5
f_featurebits: 0
f_flag: 16
f_fsindex: 10
f_size: 13107200


root@hpsrv31# uname -a
HP-UX hpsrv31 B.11.31 U ia64 0010103987 unlimited-user license

[paabhi]

Hi,

Have you ever tried this.Upon my investigation, I got some info that we need to upgrade the JFS version on 11.00 server to 3.3 and then the disk layout to 4.After that we need to present the LUNs to 11.31 server and do a vxfsconvert.

Is this step not reqd ??