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- Path: sparky!uunet!cs.utexas.edu!ut-emx!ibmchs!auschs!awdprime.austin.ibm.com!chukran.austin.ibm.com!rudy
- From: rudy@chukran.austin.ibm.com
- Newsgroups: comp.unix.aix
- Subject: Re: AIX LVM Metadata Area
- Message-ID: <1992Aug29.002119.2843@awdprime.austin.ibm.com>
- Date: 29 Aug 92 00:21:19 GMT
- References: <webIbvv0Bwx3M1871b@transarc.com>
- Sender: news@awdprime.austin.ibm.com (USENET News)
- Reply-To: chukran@austin.vnet.ibm.com(Rudy Chukran)
- Organization: IBM Advanced Workstation Division
- Lines: 19
-
- In article <webIbvv0Bwx3M1871b@transarc.com>, Barry_Wolman@transarc.com writes:
- |> An AIX Logical Volume has N-bytes of metadata at the start of the
- |> volume. User code that writes to a logical volume is supposed to
- |> avoid writing in this area. I need to determine the value of N.
- |> I've heard "don't write in the first page" ... does this mean N=4096?
- The metadata is the "volume group descriptor area" and lives outside
- the logical volumes. You can open /dev/lvxx and write till you cant
- write any longer (EOF) and not clobber any metadata.
- Howver, writing the the physical volume device (/dev/hdiskx) is another
- matter. I believe you want the former. Lots of database apps use this
- without worry.
- --
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- Rudy Chukran | EMAIL:
- IBM AIX Technical Consulting| RSCS: CHUKRAN at AUSTIN
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