WasPentalive

  • 99 Posts
  • 573 Comments
Joined 2 years ago
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Cake day: June 14th, 2023

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  • t+ and T- to upstream neighbor (2) + a single wire from upstream to tell you to send (3), R+ and R- (5) to down stream neighbor + a single wire to let downstream know when you can receive from them.(6) And a pair to control a relay in what would be like a token ring MAU. Token ring is also a logical ring and a physical star: All the physical cables come to a central hub (physical star) but the machines are connected

    Logical Ring                                                       Physical Star
    +-->[ r t ]--> [r  t] -->[ r  t ]--> [r  t] --> [ r t]--+       [ machine1 ] ===== cat 6 ==== |  mau |=====cat6== [ machine 3 ]
     |                                                                 |       [ machine2 ]====== cat 6 ====|          |====cat 6 == [ machine 4 ]
    +-----------------------------------------------------+
    
    

    until the last machine loops around to connect to the first.

    Is it anything like token ring? No, The difference is no token to lose, No ring master or deputy ring master to lead things- everyone just plays along according to basic rules. Any machine can move data to it’s upstream neigbor at any time that neighbor is ready to take it, no one machine at a time getting to talk. So it’s not like token ring. Also unlike Ethernet, you can connect any number of machines in a ring: 5 for a small office, 20 for a department of a large firm, 200 for every employee of a firm, 2000 for all the offices of a company or a part of a neighborhood. Since machines are not contending for bandwidth there is no collision, no backdown and resend.

    Rings of machines are connected to bigger rings via gateways - which also have their own way of assigning addresses to each of their ports.














  • @droolio@feddit.uk I see what you’re asking. You’re wondering if, instead of storing a duplicate file when another backup set already contains it, I could use a hardlink to point to the file already stored in that other set?

    I have a system where I create a backup set for each day of the week. When I do a backup for that day, I update the set, or if it’s out of date, I replace it entirely with a fresh backup image (After 7 backups to that set). But if the backup sets became inter-dependent, removing or updating one set could lead to problems with others that rely on files in the first set.

    Does that make sense? I am asking because I am not familiar with the utilities you mentioned and may be taking your post wrong.





  • Yeah, no problem… I started out with just bare rsync - but I did the backup infrequently and needed my notes to know the command. Then I wrote a simple shell script to run the rsync for me. Then I decided I needed more than one backup, redundancy is good. Then I wanted to keep track of the backups so I had it write to .backuplog then that file started getting dated (every time I run a “sun” backup the record of the previous one is useless) so Finally TaDa! loci is born.