I need information what maximum error level on FC card need clasification of critical level (SAN mass storidge)
Please write screenshot from utility fcutil whith test option.
Pawel (0 Replies)
Hi,
We have 12x1TB SATA disks in our array and I need to create 10TB volume. I defined new storage profile on array and when I tried to add volume, I faced with ~2TB limit for new volumes. I didn't find how to set another limit on my storage profile. Is there is a way to configure one large... (3 Replies)
Hello,
Wondering if anyone can help me with mounting a file share from my Sun T2000 server running Solaris 10 to my connected 2530 disk array?
I believe I've connected the disk array correctly and I have created a volume on the array using the filesystem (Sun_SAM-FS, RAID-5).
The T2000... (15 Replies)
Hi!
I have Sun StorageTek 2540 FC array and CAM works very slowly - I can wait for software response even more than 2 minutes... I run this software on Windows machine with Firefox Web Browser but speed is terrible... How can I make it works at least a little bit faster?.. (2 Replies)
In Sun manuals, I didn't find how to backup Sun StorageTek Common Array Manager's configuration. Is there a way to do it like backing up Brocade switch configuration? CAM is under Solaris 10.
Thank you in advance! (0 Replies)
Hi,
I have a question about Sun StorageTek Common Array Manager (CAM): What is the concept of 'host'? Is it the hostname of the server that has access to the managed array? If so, can I use its IP instead of its hostname?
I've found a 'host' under CAM called XYZ (See below). In our... (7 Replies)
Bought a Sun StorageTek 2540 SAN array a few years ago from a company that was going out of business. When we first set it up, we were able to get all the software (Common Array Manager) and firmware directly from Sun.
We just upgraded the drives, but the array is too large for the firmware. Now... (6 Replies)
hi everone
i am experiencing disconnectivity from storage to My database machines. i have doubt on my FC cards in my sparc T4-2 machines. i want to know how should i check from my solaris that whether the cards are ok or not because once the disks get disconnect from SAN so it come back again but... (5 Replies)
Discussion started by: janakors
5 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)