Re: INIT params for disk to build on-disk save sets

On Oct 23, 4:49 pm, Hein RMS van den Heuvel
<heinvandenheu...@xxxxxxxxx> wrote:
On Oct 23, 4:27 pm, AEF <spamsink2...@xxxxxxxxx> wrote:
:

I will primarily have just one large file on this disk at any given
:
disk? (For those of you who are too young to remember, these disks are
2 GB in size. Or more accurately: 4110480 TOTAL BLOCKS.)

I'm old enough... 7200 rpm, narrow scsi, big then, very small now.
You are better of with a $99 500GB USB drive if you can hook that up!

OK, so I was thinking of large value for /CLUSTER.

Yeah sure... like 512.

large value for /EXTEND, maybe 10000

Certainly, line 64000

Wait a minute. Doesn't this mean that the extend value would be
512*64000=32768000 blocks? This is larger than the disk.

Maybe I should leave the EXTENSION value at its default of 5 and
specify a huge cluster size of 10000, 20000, or 40000 (has to be .LE.
the size of the disk, which is 4110480 blocks).

BTW, the File Applications manual says that a cluster may or may not
be contiguous. I assume this means that a cluster may or may not span
two adjacent tracks, no?


small value for /HEADERS
Sure... 100?

On further though, I may as well leave it at its default of 16.

medium value for /MAXIMUM_FILES

Sure... 1000?

Someone pointed out that the index file bitmap contains one bit per
file header so that I may as well use 4096. It shouldn't really matter
much.


And maybe add /INDEX=BEG

OK.

The qualifier /INDEX=BEGINNING means the outermost cylinders, right?
Just curious.


What do y'all think? Is it even worth bothering with?

I would, but I would not expect much from it other then no longer
having the think whether I should have tweaked it some. :-). Piece of
mind.

Well, I think the EXTENSION value (measured in blocks) is important,
at least.


Hein.

Thanks!

AEF
.

Relevant Pages

  • Re: CLUSTER_SIZE ramification
    ... Also 36GB with a cluster ... > disk, but a much more reasonable used size. ... extension algorithm for INDEXF.SYS. ... You cannot have more file headers on the disk than you ...
    (comp.os.vms)
  • Re: INIT params for disk to build on-disk save sets
    ... them as a target for on-disk backups of the other disks which will ... I will primarily have just one large file on this disk at any given ... I figured extension was the most important as I've seen such ... cluster, thus a truly large cluster factor is not necessarily ...
    (comp.os.vms)
  • SUMMARY: changed WWID on cluster member boot disk
    ... disk and quorum disk of a single-member cluster, ... I could no longer boot from the cluster disks, ... the pre-cluster stand-alone system disk; ... the root1_domain on LUN containing the member boot disk was found ...
    (Tru64-UNIX-Managers)
  • Join an existing cluster
    ... I had a cluster setup with 2 computers running windows ... shared disk array. ... Creating a dummy Local Quorum resource. ... on the same storage bus as the boot disk... ...
    (microsoft.public.windows.server.clustering)
  • Re: Creating a wide area VMS Cluster
    ... > My goal is to provide a disaster tolerant cluster for both OS and data. ... disrupting the balance of the effect of votes between sites A and B. ... You have the option of a single shadowed system disk between the ...
    (comp.os.vms)