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Anyone know of an issue with the chfs -a splicopy command in AIX 5.2
ML4 when using jfs2 filesystems?

The jfs filesystem seems to work, but we tried it with jfs2 and it does
not even give an error in that version

# chfs -a splitcopy=/mbusample /montship
# echo $?
0

samplelv jfs2 6 12 2 open/syncd /sample
samplog jfs2log 1 2 2 open/syncd N/A

Thx.

Steve N.

Sorry,

the command we used was

# chfs -a splitcopy=/mbusample /sample

Are u trying to see the error or is it that you were trying to mount
the splitcopy file system

and getting an error.

You can try the splitvg command which is better than splitcopy

I'll check on the splitvg command. Thx. We do not want to split the
entire VG but if it has an option to split by LV that should work just
as well for us.

Of course, it does mean that our automated backup scripts would have to
be changed. We currently use the splitcopy option on the JFS type file
systems and it worked fine from AIX 4.3.2 up to AIX 5.1. However, we
have started implementing sites with the new enhanced (JFS2) file
systems and when we tried the procedures we found it does not do a
thing in AIX 5.2.

Here is what we usually see with JFS, even on AIX 5.2:

# chfs -a splitcopy=/mirror /sample
samplelvcopy00
backup requested(0x100000)...
log redo processing for /dev/samplelvcopy00
syncpt record at 2028
end of log 2028
syncpt record at 2028
syncpt address 2028
number of log records = 1
number of do blocks = 0
number of nodo blocks = 0

# df |egrep "sample|mirror"
/dev/samplelv 524288 16508 507780 4% /sample
/dev/samplelvcopy00 524288 16508 507780 4% /mirror

# lsvg -l datavg |grep samp
samplelv jfs 2 4 2 open/stale /sample
samploglv jfslog 1 2 2 open/syncd N/A
samplelvcopy00 jfs 0 0 0 open/syncd /mirror

Using the same command on a JFS2, we just immediately get the shell
prompt back, and the /mirror file system does not get created or
mounted, and the logical volumes stay sync'd with no new samplelvcopy00
being created.

Ideally, we would like to make use of the new JFS2 file system because
one of our file systems contains thousands of scanned images and JFS2
handles searching/sorting in this area better.

Based on the IBM man pages documentation, I thought maybe JFS2 is not
supported with the splitcopy command as it only mentions JFS, but I saw
someone in the Usenet groups whose message led me to believe that they
had it working with JFS2.

Thanks Again

Steve

A follow-up on this topic: We finally contacted IBM AIX Support on this
issue and they tell us that the chfs -a splitcopy option is not
supported on JFS2 file systems.

They recommend "...For JFS2, you should be using the snapshot
command..."

Hope this helps someone. We are now reviewing how the snapshot command
works as an alternative for our JFS2 configurations.

Steve