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- From: julie@levell.austin.ibm.com (Julie L. Craft)
- Newsgroups: comp.unix.aix
- Subject: Re: AIX LVM Metadata Area
- Message-ID: <1992Sep1.152635.8639@awdprime.austin.ibm.com>
- Date: 1 Sep 92 15:26:35 GMT
- References: <webIbvv0Bwx3M1871b@transarc.com>
- Sender: news@awdprime.austin.ibm.com (USENET News)
- Organization: IBM, Austin
- Lines: 26
-
- 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?
- >
- >Thanks,
- >Barry Wolman
-
- Block 0 of the logical volume is used to store data about the logical
- volume that is not stored in the VGDA. We call it the logical volume
- control block. It's 1 512 byte block. Most applications we have
- usually start at block 1 to avoid writing over this block. The real
- importance of this block is for importing a volume group. If you have
- a raw logical volume that is overwriting this block, I wouldn't worry
- about it unless you want to import it on another system, but even then
- you can just fix it up with chlv later.
-
- Later,
- Julie
-
- --
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- Julie Levell Craft IBM AUSTIN,TX Internet: julie@aixwiz.austin.ibm.com
- IBMNET: JULIEL at AUSVM6 2F-007/903 (512) 838-2677 (Tie 678-2677)
- "I'm not getting defensive!"
-