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IDS Forum

Re: Extent DB

Posted By: Art S. Kagel (Oninit LLC)
Date: Tuesday, 11 December 2007, at 12:41 p.m.

In Response To: Re: RE: Extent DB (MICHAEL MEIER)

MICHAEL MEIER wrote:
> Thanks for the quick response. Sounds easy. I thought I haven't to read
> anything about chunks because I won't use them.
>

You're always using chunks, IDS only deals with disk as 'chunks' of
space. It's just that when you create a new dbspace you assign it's
initial disk chunk at the same time so you never realized it. Once a
dbspace exists you can expand the dbspace by attaching more disk chunks
to the dbspace.

> So a kind of order is
> Disk1->chunk->dbspace->DB
> Disk2->Chunk^
> I think I got this.
>
> Why I have to do a a Level 0 backup if add space ?
>

You want to take a level zero archive immediately after adding the chunk
so that if your system crashes you won't have to add the chunk all over
again after restoring from an archive that doesn't know about it.

> I use the disk as raw devices, thats why I did'nt add an offset.
> Is this OK for a raw device ?
>

Marcus is recommending using an offset for your chunks because the disk
partitioning software he uses places the partition table at the
beginning of the first disk partition. So chunks defined on that first
chunk REQUIRE an offset to avoid overwriting that table. He uses
offsets on all chunks as a precaution in case he has to replace a
crashed drive and needs to restore to a first partition a chunk that
used to be on a higher numbered partition. If you are using more modern
partitioning software than fdisk, it likely places the partition table
in unallocated disk space at the beginning or the end of the drive/array
that is walled off from the defined partitions so it is safe. Check
with your Systems Administrators as to whether you need to allow offsets
for the partition table (make them check if they are not sure as they
don't normally worry about it making filesystems since UNIX filesystems
include the offset when they are created automatically).

Offsets are ONLY needed, if they are needed at all, for chunks built
from RAW and COOKED device files, not for chunks defined in filesystem
files.

Art S. Kagel
> Freudi
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

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