01-21-2013
Last edited by orange47; 01-21-2013 at 11:54 AM..
9 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
I have a solaris 9 machine which I would like to mirror it system disk using disk suite but my sun solaris machine has one internal disk which has the OS installed on. I have spare external disk of the same size, is it possible to mirror and internal disk with external disk using disk suite?
... (3 Replies)
Discussion started by: hassan2
3 Replies
2. UNIX for Dummies Questions & Answers
Hi I'm new Solaris.
I'm trying to understand how a root device is being mirrored. When do df -k I get this:
Filesystem kbytes used avail capacity Mounted on
/dev/md/dsk/d0 49915840 43168158 6248524 88% /
/proc 0 0 0 0% /proc... (1 Reply)
Discussion started by: ND6
1 Replies
3. AIX
Hi,
I have an ssa filesystem to move to san. We don't want any downtime. I heard that you can do a mirroring of existing file system on the san. The file system is a type of either raid 0, raid 1, or raid 5.
Anyone know how to do this?
Thanks in advance,
itik (4 Replies)
Discussion started by: itik
4 Replies
4. Solaris
I've looked a little but haven't found a solid answer, assuming there is one.
What's better, hardware mirroring or ZFS mirroring? Common practice for us was to use the raid controllers on the Sun x86 servers. Now we've been using ZFS mirroring since U6. Any performance difference? Any other... (3 Replies)
Discussion started by: Lespaul20
3 Replies
5. Solaris
Hi All,
I have detached a mirror and primary disk from my Solaris box.
On trying to boot from Primary disk, It boots up good.
But from my mirror disk, it is not booting and giving me the login prompt
Instead it goes to maintenance state by issuing a coredump.
Can you explain why... (9 Replies)
Discussion started by: jegaraman
9 Replies
6. Solaris
Solaris 10 5/08 on Ultra 40 M2
It boots fine off primary disk but having issues booting off the mirror disk.
I get this error when booting off mirror disk:
Booting 'Solaris 10 ... Mirror disk'
root (hd1,0,a)
Error 22: No such partition
Press any key to continue...
Any... (7 Replies)
Discussion started by: etc
7 Replies
7. Solaris
Hi ,
I am new to SVM .when i try to learn RAID 1 , first they are creating two RAID 0 strips through
metainit d51 1 1 c0t0d0s2
metainit d52 1 1 c1t0d0s2
In the next step
metainit d50 -m d51
d50: Mirror is setup
next step is
metaattach d50 d52
d50 : submirror d52 is... (7 Replies)
Discussion started by: vr_mari
7 Replies
8. Solaris
HI Friends....
kindly explain os mirror patching?in SVM and Vxvm.
:wall: (1 Reply)
Discussion started by: Rajesh_Apple
1 Replies
9. HP-UX
what is the difference between DRD and Root Mirror Disk using LVM mirror ? (3 Replies)
Discussion started by: maxim42
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)