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- From: twyang@cs.uh.edu (Tien-Wan Yang)
- Subject: SCSI disk and volume group problems
- Message-ID: <1992Sep3.154851.26029@menudo.uh.edu>
- Keywords: jfs i-nodes filsystem
- Sender: usenet@menudo.uh.edu (USENET News System)
- Nntp-Posting-Host: rodin.cs.uh.edu
- Organization: Computer Science dept., Univ. of Houston (Main Campus)
- Date: Thu, 3 Sep 1992 15:48:51 GMT
- Expires: Sat, 3 Oct 1992 05:00:00 GMT
- Lines: 32
-
- Hi,
-
- In our lab. we have two SCSI disks attached to an RS6000 with AIX 3.2. Each
- disk has about 2 gigabytes. Since our lab's main function is seismic data
- processing, we need large file system. The AIX 3.2 README says that when
- a file system size bigger than 800 Mb there might be some problem. We did
- experience problems when we set a single file system with size about 1.9 Gb.
-
- So I tried to partition the two SCSI disks into 2 volume groups; each volume
- group on a single physical volume. I have the following questions:
-
- 1. What is the major number for a volume group on a SCSI disk?
- 2. Should I use the same major number or different major number for
- different volume group on SCSI disk?
- 3. If a volume group has 2 physical volumes, is it reliable to interleave
- a logical volume on these 2 disks?
-
- I already ran into trouble: I specified a volume group on a SCSI disk with
- major number 17. It works. I specified another volume group with major
- number 19. It failed. When I tried to delete this failed volume group, I
- failed again and got the following message:
-
- 0516-044 lqueryvg: The write to internal map file failed. Confirm
- space is available under the filesystem directory /etc then
- execute varyonvg again.
- 0516-882 reducevg: Unable to reduce volume group.
-
- I looked through info but couldn't find any helpful information. Can someone
- help. Any hint or suggestion will be appreciated. Thanks in advance.
-
- Tien-wan Yang twyang@cs.uh.edu
-
-