I have a situation where I need to do Flash Archive, and the local
storage is not enough. But I cannot use NFS due to security reason, I
cannot deploy Secure NFS also, and the available connectivity is only SSH.
Therefore I am using Sys V IPC named pipes to capture the target file
into pipe, to be transported to SSH to another host.
The problem is, named pipe cannot be sustained long enough for Flash
archive creation from host "charlie" to host "golf" as the recipient.
From terminal #1 at host charlie
r...@charlie # mknod /var/sun/mksysb.pipe p
r...@charlie # ls -al /var/sun/mksysb.pipe
prw-r--r-- 1 root root 0 Dec 12 16:11 /var/sun/mksysb.pipe
r...@charlie # cat /var/sun/mksysb.pipe |ssh r...@golf "cat >
/data/work/target.flar"
Password:
From terminal #2 at host golf
bash-3.2# ps -ef|grep cat
root 900 891 0 16:12:02 ? 0:00 sh -c cat >
/data/work/target.flar
root 901 900 0 16:12:02 ? 0:00 cat
root 911 887 0 16:59:26 pts/2 0:00 grep cat
The pipe was created, anything written on host charlie at
/var/sun/mksysb.pipe will be written on host golf at /data/work/target.flar
Then from terminal #3 at host charlie
r...@charlie # flar create -n test -c -x /var/sun -x /export/frontline
-x /export/home -x /export/install /var/sun/mksysb.pipe
Full Flash
Checking integrity...
Integrity OK.
Running precreation scripts...
Precreation scripts done.
Determining the size of the archive...
The archive will be approximately 2.98GB.
Creating the archive...
No space left on device
Unable to write archive file.
ERROR: Unable to write archive.
Running pre-exit scripts...
Pre-exit scripts done.
When I check the terminal #1, I can still see that the process is still
running, has not been killed
back to terminal #2 :
bash-3.2# ps -ef|grep cat
root 900 891 0 16:12:02 ? 0:00 sh -c cat >
/data/work/target.flar
root 901 900 0 16:12:02 ? 0:00 cat
root 911 887 0 16:59:26 pts/2 0:00 grep cat
back to terminal #3 :
r...@charlie # ls -al /var/sun/mksysb.pipe
/var/sun/mksysb.pipe: No such file or directory
r...@charlie # ps -ef |grep cat
root 1099 852 0 16:12:05 pts/2 0:00 ssh r...@golf cat >
/data/work/target.flar
root 1098 852 0 16:12:05 pts/2 0:00 cat /var/sun/mksysb.pipe
root 1353 873 0 16:59:48 pts/3 0:00 grep cat
r...@charlie #
So we can see the process are still intact, but the Unix Sys V IPC using
named pipes cannot withstand the duration of Flash Archive.
I have no problem transferring data of 2-3 GB which is taking about 4-5
minutes in Fast Ethernet. But for Flash Archive creation, it looks like
I need to sustain at least 2 hours.
Any advice on this? Thanks in advance.
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