Re: replacing mounted rootdbs as raw diskspace

Neil Truby wrote: > > Art S. Kagel wrote: > > > Yes, raw space is significantly faster. To do this: > > > > 1) bring the engine down: onmode -ky > > 2) copy the rootdbs file to the raw device: > > dd if=/datafs/rootdbs of=/dev/rdsk/sd2d bs=2k count={rootsize in pages} > > > > 3) delete or rename filesystem copy of rootdbs or remove the symbolic > > link you used for ROOTPATH in $ONCONFIG > > 4) link the ROOTPATH name from $ONCONFIG to the raw device as a > > symbolic link: > > ln -s /dev/rdsk/sd2d /datafs/rootdbs > > > > That should do it. > > Yes, I've done this and it worked OK. I've never had the guts to do it > on a production system 'though! I do feel that the "approved", safe > method would be to do an archive, swap links, then a restore. However, > this will of course only work if the ROOTPATH points to a link to the > cooked file system, rather than just the name of the filesystem file. > One slight problem.... If you are using the LVM (Logical Volume Manager) on AIX, HP-UX, etc ... you may need to increase your offset otherwise you will over write some of the LVM's info if you don't include the offset. Yeah, you may want to consider using the LVM to help manage the raw chunks. (But that's another topic, and I only play a DBA on tv. ;-) -Uncle Mikey (If it aint UNIX, its crap. Or was that Scottish? Oh well, so much for SNL ...) -- #include <std_disclaimer.h> /* Mike Segel (MS385) */ #include <No_Spam.h> #ifdef OFFENDED_BY_CONTENT The author takes no responsibility for this post. Any resembalence to a coherent rational thought is purely coincidence. -The Management. #endif ***************************** * Attention * -*- Due to AGIS's Refusal to Act Responsibly -*- Due to ACSI's Refusal to Act Responsibly We are blocking all of their domains at the packet level. This block will exist until they modify their policies to conform to existing RFCs and net community standards. We encourage all ISPs and domain holders to do the same. *****************************