I just installed IBMsddsun64_........... on my sun server. I untarred it (tar xvf) & I tried to install the paxkage. When I did pkgadd -d ./IBMsdd..... I get a message Error, no packages were found.
Any idea
Thanks, (1 Reply)
Hi all,
Sorry if this is in the wrong place but needed to make sure lots of people saw this so that hopefully someone will be able to help.
Basically i've upgraded a test server from 4.3 to 5.3 TL04.
The server has hdisk0 and 1 as rootvg locally but then has another vg setup on our ESS... (5 Replies)
Hi all,
Sorry if this is in the wrong place but needed to make sure lots of people saw this so that hopefully someone will be able to help.
Basically i've upgraded a test server from 4.3 to 5.3 TL04.
The server has hdisk0 and 1 as rootvg locally but then has another vg setup on our ESS... (1 Reply)
Hello Unix Admins:
Has any one in this distribution list implemented SVC (SAN Volume Contoller - A solution from IBM) in your environment? If you have, do you have any do's / don'ts? Anything which you like sharing would be really appreciated.
For example, my inputs:
I tried implementing... (1 Reply)
Can anyone recommend me some reading material surrounding how AIX handles LUNs:
- with and without MPIO installed
- with and without SDD or SDDPCM installed
Where does lspath sit in all of this (MPIO layer?). Can a system be built with just MPIO software? Is MPIO software even needed?
I guess... (0 Replies)
I was wondering if there is a way of auto-detecting a new vpath, using IBM's SDD driver, on a Linux platform.
ON AIX it is a simple as running cfgmgr.
Alan (0 Replies)
Hi folks.
We want to move a "physical" AIX box to a VIOed LPAR. The physical box is running SDD with disks from a DS8300. I want to be able to reattach those LUNs from the DS8300 to my VIO server which is running SDDPCM and then assigned them back to my AIX LPAR. Any thoughts about this?
I... (1 Reply)
Dear Guru,
IHAC who is using Redhat Linux 5 on DELL M910.
When system bootup, it show "Buffer I/O error on device sdd" error message. Below is the "dmesg" output.
The scenario is:
If more external FC SAN disk LUN add, the device would change other name. So it will impact the raw device... (7 Replies)
hi all
we recently upgraded our san switches. after that, i found i got many hdisks showing in lsdev with status "Defined" and "Available". the number of "Defined" is equal to "Available". the time stamp shows all "Available" disks created at our downtime night.
"datapath query device"... (0 Replies)
This is getting very confusing for me, and appreciate if someone can help.
Platform: Power VM ( Virtual I/O Server)
ioslevel 2.1.3.10-FP23
# oslevel -s
6100-05-00-0000
Storage: IBM DS4300
Two HBAs - Dual Port Fibre Adapter Channels
Each card has two ports , so a total of 4 ports going... (3 Replies)
Discussion started by: filosophizer
3 Replies
LEARN ABOUT DEBIAN
bup-margin
bup-margin(1) General Commands Manual bup-margin(1)NAME
bup-margin - figure out your deduplication safety margin
SYNOPSIS
bup margin [options...]
DESCRIPTION
bup margin iterates through all objects in your bup repository, calculating the largest number of prefix bits shared between any two
entries. This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.
For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45. That means a 46-bit
hash would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
its first 46 bits.
The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects. Since SHA-1 hashes have 160 bits,
that leaves 115 bits of margin. Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
with far fewer objects.
If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see if
you're getting dangerously close to 160 bits.
OPTIONS --predict
Guess the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
from the guess. This is potentially useful for tuning an interpolation search algorithm.
--ignore-midx
don't use .midx files, use only .idx files. This is only really useful when used with --predict.
EXAMPLE
$ bup margin
Reading indexes: 100.00% (1612581/1612581), done.
40
40 matching prefix bits
1.94 bits per doubling
120 bits (61.86 doublings) remaining
4.19338e+18 times larger is possible
Everyone on earth could have 625878182 data sets
like yours, all in one repository, and we would
expect 1 object collision.
$ bup margin --predict
PackIdxList: using 1 index.
Reading indexes: 100.00% (1612581/1612581), done.
915 of 1612581 (0.057%)
SEE ALSO bup-midx(1), bup-save(1)BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown-bup-margin(1)