Minutes 2025-01-16: Difference between revisions

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=== RAID (and ZFS) By: Noah ===
=== RAID (and ZFS) By: Noah ===


* RAID stands for “Redundant Array of [Inexpensive/Independant] Disks”
* RAID stands for “Redundant Array of [Inexpensive/Independent] Disks”
* Used by enterprises for high availability on drives and resiliency.
* Used by enterprises for high availability on drives and resiliency.


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* calls RAIDs something different RAID0 -> stripe
* calls RAIDs something different RAID0 -> stripe
* Described as paranoid because it doesn’t trust anything from your disks and constantly checks and compares information to parity calculation.
* Described as paranoid because it doesn’t trust anything from your disks and constantly checks and compares information to parity calculation.
* Shell server is set with ZFS in RAID10 all in one single zpool, which allows the shell to put a quota on datasets so no users can get out of hand
* Shell server is set with ZFS in RAID10 all in one single zpool, which allows the shell to put a quota on datasets, so no users can get out of hand
* Extra features
* Extra features
** has a cache vdev that reads in a ring buffer
** has a cache vdev that reads in a ring buffer
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* CEPH
* CEPH
** Different take on filesystems
** Different take on filesystems
** only 6-9 servers with SEPG under LUG jurisdiction
** only 6-9 servers with CEPH under LUG jurisdiction
** Treats all disks in the cluster as one giant group
** Treats all disks in the cluster as one giant group
** Overkill for our purposes
** Overkill for our purposes
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* Cypher-Con is happening soon
* Cypher-Con is happening soon
** Not gonna be reimbursed by RED TEAM or college
** Not gonna be reimbursed by RED TEAM or college
** happening in milluwake
** happening in Milwaukee
** provided two free hotel rooms
** provided two free hotel rooms
* Got a subnet from IT
* Got a subnet from IT
** Total of 30-ish public addresses
** Total of 30-ish public addresses
** can use it to reverse-net for people who don’t have their own public IP addresses
** can use it to reverse-net for people who don’t have their own public IP addresses
** potential Zigby talk
** potential Zigbee talk
** hosting an access control booth to do OSDP challenges
** hosting an access control booth to do OSDP challenges
* Tunnel Bob - cops have chased him through the tunnels and have yet to apprehend him talked about tunnelers who would make master keys and break into the steam tunnelers (vatting/tunneling)
* Tunnel Bob - cops have chased him through the tunnels and have yet to apprehend him, talked about guys at MIT that would get into steam tunnels (vadding/tunneling)
** mentioned in the jargon file
** 'vadding' mentioned in the jargon file
* watch out for elevator counterweights
*** Mentions "elevator rodeo"
**** "Watch out for elevator counterweights"
* idea for printing cards that are LUG-themed to replace the current id’s
* trying to get the stuff for LUG shirts
* Idea for making cards that are LUG-themed
* Trying to get the equipment for LUG shirts
[[Category:Meeting Minutes]]
[[Category:Meeting Minutes]]

Revision as of 22:31, 14 February 2025

RAID (and ZFS) By: Noah

  • RAID stands for “Redundant Array of [Inexpensive/Independent] Disks”
  • Used by enterprises for high availability on drives and resiliency.

Drawbacks over flat Disks

  • increased power draw

RAID levels

  • RAID0
    • Storage is that of every disk combined
    • Fastest for reading and writing
    • not really used anymore
  • RAID1
    • One disk replicated across every other disk
    • Common for boot drives
  • RAID5
    • Any one disk is allowed to fail in a given array without losing any data
    • used to be a gold standard, but fell out of favor due to disk size increasing
  • RAID6
    • Any two disks can fail in a given array without losing data
    • the new gold standard
    • if disks fail during rebuild, it allows another to fail.

Nested RAID levels

  • RAID10
    • RAID01 (bad)
    • WMTU uses RAID60

Weird RAID levels

  • RAID2
    • implemented own error correction
    • no reason to use it at all because HDDS implements its own error correction
  • RAID3
    • Striped data at byte-level rather than block levels
    • Replaced by RAID5
    • used in video streaming

ZFS

  • zfs is the storage administrator, while the user only has to check in
  • arrays are now pools
  • logical volumes are now datasets
  • has its own approach to logical structure
  • calls RAIDs something different RAID0 -> stripe
  • Described as paranoid because it doesn’t trust anything from your disks and constantly checks and compares information to parity calculation.
  • Shell server is set with ZFS in RAID10 all in one single zpool, which allows the shell to put a quota on datasets, so no users can get out of hand
  • Extra features
    • has a cache vdev that reads in a ring buffer
    • SLOG, stores the ZFS intent
  • biggest issue: licensing
    • Sun was trying to get out of the GPL and then have parasite companies from directly shipping ZFS
    • now oracle has ZFS and has first-party support on Solaris
    • maintains BTRFS support
  • OpenZFS
    • last open-source version of ZFS
    • Under MIT license
    • used to be better supported on the BSD’s
  • BTFRS
    • made a few advancements in filesystems since ZFS
    • Great for home labs
    • biggest problem: no RAID5/6, might not ever be supported
    • Better Linux integration, don’t have to worry about importing kernel modules
  • CEPH
    • Different take on filesystems
    • only 6-9 servers with CEPH under LUG jurisdiction
    • Treats all disks in the cluster as one giant group
    • Overkill for our purposes
    • the cluster self-manages
    • common for VM images
    • can pick and choose the redundancy per file

LUG News

  • Cypher-Con is happening soon
    • Not gonna be reimbursed by RED TEAM or college
    • happening in Milwaukee
    • provided two free hotel rooms
  • Got a subnet from IT
    • Total of 30-ish public addresses
    • can use it to reverse-net for people who don’t have their own public IP addresses
    • potential Zigbee talk
    • hosting an access control booth to do OSDP challenges
  • Tunnel Bob - cops have chased him through the tunnels and have yet to apprehend him, talked about guys at MIT that would get into steam tunnels (vadding/tunneling)
    • 'vadding' mentioned in the jargon file
      • Mentions "elevator rodeo"
        • "Watch out for elevator counterweights"
  • Idea for making cards that are LUG-themed
  • Trying to get the equipment for LUG shirts
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