Re: 450 disk problems
In article <32710500.E48F1884@PRIMENET.COM>, John Bennett <TROG48@PRIMENET.COM> writes >IF you useing HPUX LVM disks make use of the rlvol and NOT >the dev/dsk/driver...ie link the chunk to the /dev/vg01/rlvol1 etc.. >use pvdisplay, lvdisplay, vgdisplay to look at the drives, not a good idea to >mix os data with >INFX data on a rlvol...INFX does not need offsets in the rlvol (as long as one >chunk per >rlvol)...i posted some HP LVM reporting scripts on my server ...19thave.com, >jbennett >post here if you need more info....jb > >Maria Wilson wrote: > >> Hi all, >> >> > Anyone come across this problem. The article below contains a caveat about >> > creating database partitions on non-Sun disk drives. Does Informix show the >> > same behavior as Sybase when writing raw drives? >> > TIA, Maria >> >> ------------------------------------------------------------------------------ >---------------- >> >> > Path: reznor.larc.nasa.gov!lll-winken.llnl.gov!uwm.edu!vixen.cso.uiuc.edu!\\ >> > howland.erols.net!newsfeed.internetmci.com!128.223.220.30!\\ >> > logbridge.uoregon.edu!nntp2.dejanews.com!nnrp1.dejanews.com!\\ >> > not-for-mail >> > >From: Sean_Gracey@hotmail.com >> > Newsgroups: comp.sys.sun.admin >> > Subject: Re: 450 disk problems. >> > Date: Thu, 28 May 1998 00:42:35 GMT >> > Organization: Deja News - The Leader in Internet Discussion >> > Lines: 25 >> > Message-ID: <6kibts$2td$1@nnrp1.dejanews.com> >> > References: <RoHa1.143$644.2804807@WCG-Reader> >> > <6kg0d8$1ic$1@camel15.mindspring.com> >> > NNTP-Posting-Host: 192.237.114.65 >> > X-Article-Creation-Date: Thu May 28 00:42:35 1998 GMT >> > X-Http-User-Agent: Mozilla/4.04 [en] (X11; I; Linux 2.0.31 i586; Nav) >> > Xref: reznor.larc.nasa.gov comp.sys.sun.admin:117638 >> > >> > Is he running sybase or any other product that accesses raw disk devices ? >> > Sybase when writting to a partition that contains cylinder 0 will destory a >> > partition table / disk label. Depends upon the OS and version but basically true. e,g, early version of HP-UX the /dev/r.. file DOES include the partition table/disk label. Later versions (and depends upon if a LVM is used/ which LVM is used) the /dev/r.. file DOES NOT include the partition table/disk label. These are stored at the start of the disk and vary in size depending upon UNIX type (HP-UX,Solaris,SCO,OSF/1) and OS version (Sorlaris 2.4 uses 4K, Solaris 2.5.1 uses 8K!, source Informix UK Technical Support) >> > >> > In article <6kg0d8$1ic$1@camel15.mindspring.com>, >> > > >> > > >zep@wcg.net (Zep) wrote: >> > > > I have a friend who's running sparc 450(s) with solaris 2.5.1 >(almost >> > > >no patches installed) and he's says partition tables disappear for no >> > > >apparent reason(!?) If anyone has any similar experiences, or could Correct. If you overwrite the first 8K of the disk you lose the partition label/disk label and the disk becomes inaccessible. Of course this is usualy cached in UNIX disk buffers. Writing to /dev/r... does NOT update the UNIX disk buffers. Since UNIX has it in the cache it does not notice the change and since the cached copy has not been written to, it does not get flushed back to disk when you shutdown. Hence when you startup after the a reboot, the modified area is read from disk and BOOM! you cannot access any filesystems on that disk! The best bit is that Online keeps working since it does not need a partition table! I always skip the first 50K-100K of the disk. I choose a value which makes the chunk size a multiple of 100K i.e. the last two digits of the chunk size are 00. >point >> > > >me to some resources, I would appreciate it. Many thanks. The Online manual says consult your UNIX manufacturer.. >> > > >> > > >> > >> > -----== Posted via Deja News, The Leader in Internet Discussion ==----- >> > http://www.dejanews.com/ Now offering spam-free web-based newsreading >> > >> >> -------------------------------------------------------- >> Maria L. Wilson 757.766.8265 >> Computer Sciences Corporation 757.766.2571 fax >> NASA Langley Research Center m.l.wilson@larc.nasa.gov >> 3217 North Armistead Ave. http://www.larc.nasa.gov >> Hampton, Va 23666 >> -------------------------------------------------------- >> If there is no God, who pops up the next Kleenex? >> -- Art Hoppe >> -------------------------------------------------------- > > > -- David Williams Maintainer of the Informix FAQ Primary site (Beta Version) http://www.smooth1.demon.co.uk Official site http://www.iiug.org/techinfo/faq/faq_top.html I see you standin', Standin' on your own, It's such a lonely place for you, For you to be If you need a shoulder, Or if you need a friend, I'll be here standing, Until the bitter end... So don't chastise me Or think I, I mean you harm... All I ever wanted Was for you To know that I care