On Mon, 8 Aug 2005, Tony Nguyen wrote: > Frank Batschulat wrote: >> On Wed, 03 Aug 2005 16:02:26 +0200, Matty <matty91 at gmail.com> wrote: >> >>> >>> When a system boots from a mirrored meta device, does it always sync from >>> the lowest submirror (e.g., Submirror 0) to the highest submirror (e.g., >>> Submirror 1)? Is there a way to force a resynchronization from the >>> highest Submirror to the lowest Submirror (this would be helpful when you >>> trash the primary mirror when booted from CDROM, and don't want to >>> corrupt the working mirror when you reboot). I usually control this my >>> moving RC scripts and booting from the secondary mirror, but wanted to >>> see what other methods existed. The section "RAID-1 Volume (Mirror) >>> Resynchronization" on docs.sun.com doesn't seem to address this specific >>> scenario: >>> >>> http://docs.sun.com/app/docs/doc/816-4520/6manpiejc?a=view >> >> >> this question is far better answered by the SVM folks on the >> LVM discussion list: >> >> http://www.opensolaris.org/jive/forum.jspa?forumID=16 >> >> lvm-discuss at opensolaris.org >> >> --- >> frankB >> _______________________________________________ >> ufs-discuss mailing list >> ufs-discuss at opensolaris.org > > What do you mean by 'trashing the mirror when booting from the CD-ROM'? I'm > guessing you mean trashing(writing to) the first submirror/boot device. > Clarifications on this will help us better answer your questions. Some > information on
I was thinking of a case where you accidentally ran rm -rf * on a directory under / on submirror 0. > > There's no way for a user to specify which submirror the resync will get data > from. However, in your case, a good workaround, similar to what you've done So does it always sync from Submirror 0 to Submirror 1 in the case of a mirror? If you boot from Submirror 1, it seems logical that it would sync from submirror 1 back to submirror 0. From the test I just did, this doesn't seem to be the case. > is: > - detach the primary mirror before booting from the CD-ROM (you also need to > change the default boot device in either the BIOS or eeprom). > - after trashing the old primary boot device, reboot using the remaining > submirror. > - attach the old submirror to the mirror to sync its data. Thanks for the info! > > -tony >
