From: Grzegorz Bakalarski (G.Bakalarski@icm.edu.pl)
Date: Tue Jan 23 2007 - 05:39:38 EST
Dear All.
I'm relatively new to SVM and X86 Solaris (I worked
long time with sparc system which did not use SDS or other
volume managers - we had not such need - we used a "spare
root disk" instead which was backup copy of working root).
Now I have a thumper X4500 which is to be file server so I need
to make it as reliable as possible ...
It has 48 Sata disks 500GB each ... So useable is about 20TBytes of
space (zfs in action!).
I cope with root mirroring under SVM ...
>From BIOS there are 2 disks seen. I installed Sol10 11/06, made
mirror using SVM and now trying to install patch cluster...
Because some patches should be installed in Single User mode
I booted system using FailSafe option in GRUB (It was working
without SVM !!! I had to boot using FailSafe mode when
the system hung once and I had to issue cold power off...
Then it started fine and made required maitnanace tasks in
boot archives).
But this time (with SVM mirror) I cannot boot into single user mode:
SunOS Release 5.10 Version Generic_118855-33 32-bit
Copyright 1983-2006 Sun Microsystems, Inc. All rights reserved.
Use is subject to license terms.
Booting to milestone "milestone/single-user:default".
Configuring devices.
Searching for installed OS instances...
/dev/dsk/c5t0d0s0 is under md control, skipping.
/dev/dsk/c5t4d0s0 is under md control, skipping.
No installed OS instance found.
Starting shell.
# uname -a
SunOS 5.10 Generic_118855-33 i86pc i386 i86pc
#
It look like it is not possible to boot to single user mode
with active SVM root mirroring ... IS IT TRUE ?????
So there is real question in using SVM root disk mirroring at all!!!!
So what should I do in order to boot to single user mode in my configuration?
Should I from this strange FailSafe prompt destroy SVM mirroring (only root (/)
or also /var & /usr & /opt) and reboot again to failsafe (hopefully with success)
and then install patches on one side of mirror (which is now simple
disk) and after all work done, reboot , again encapulate root disk,
reboot next time, attached mirrors, and wait for resync ....?
Is this the only way ? (well "it's not handy & fast" way and
really I afraid what happens when we'll have eg. electric power
failure? And also I will have to drop out my plans to make regular
system updates because of longer downtime and much of hand work (if there is
planned down time we update as many machines as possible))...
if the answer is YES, I'm curious why SUN did not equip such thumper with hardware
root disk mirroring ... Sata disk are not so reliable, so root mirrioring
of such huge machine is a must ...
Please share your opinions ...
Kind regards,
Grzegorz
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