Solaris

I think you are confusing yourself... and me in the process. You have two slices: c0t0d0s4 and c0t1d0s4. Which of them contains data that you want to keep?

Trying to simplify more :

Code:

/dev/md/dsk/d5          5G   3G    2G    70%    /usr1

before patching :

Code:

d5 -m d15 d25 1
d15 1 1 c0t0d0s4
d25 1 1 c0t1d0s4

After patching since I have detached the mirroring :

Code:

d5               m   20GB d15
    d15          s   20GB c0t0d0s4

:-here, check df -h ...so,all the data for /usr1 is in c0t0d0s4 despite the server is booted with c0t1d0 disk

Reemeber server is booted with c0t1d0..


Moreover the slice c0t0d0s4 will be having the broke apps configs too...

It doesn't matter which slice the server is booted with. Just explain which one currently holds the data that you want to keep: c0t0d0s4(d5) or c0t1d0s4?

I am sorry if I am being too annoying, but can you please tell here which disk will have all the data [of course I am taking into consideration /usr1 i.e.slice 4 of boththe disk only]from the day that I have patched if :

df -h has following entry :

Code:

/dev/md/dsk/d5          5G   3G    2G    70%    /usr1

and
metastat -p has

Code:

d5               m   20GB d15
    d15          s   20GB c0t0d0s4

So let me get this straight. You detached mirrors and patched the server 40 days ago. For 40 days the server was running with patched version of the operation system, correct? Then today you found out that the applications are not really working properly with the patched system (after using it for 40 days) correct? So you booted second disk today, which contains the system as it was 40 days ago, right?

You understood the scenario but not the time line....

The server was patched 40 days back and at the same timeI found out that my apps are not working and I booted with secondary disk the same day [40 days back]..

my d5 md device is currently a one-way mirror which has slice of the patched disk [c0t0d0]....

d5 is mounted on /usr1 [which should have been /dev/dsk/c0t1d0s4 mounted on /usr1, but I missed to update the vfstab file before booting into c0t1d0]..so for the past 40 days whatever changes that I have done will be ultimately written to c0t0d0s4 and not on c0t1d0s4 [as it is not a part of my mirror]...correct ?

Now I want to revert back my mirroring by making c0t1d0 [unpatched] as my primary disk and c0t0d0 [patched] as my mirrored disk.

Will that affect my data on /usr1 ?

Yes. That is correct. If you have been using d5 (c0t0d0s4) as /usr1 during those 40 days, then all the changes are on that slice. To move that data to c0t1d0s4 you can safely use steps that I provided earlier (https://www.unix.com/302575411-post6.html).