IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 11 June 2020 (all times are UTC)
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| 13:52 | <markit> hi alkisg :) by chance, do you "support", suggest and have you a good experience with ZFS on ltsp server? The only feature I really would love is "rolling snapshots" (i.e. "n" sets of last snapshot), just in case someone deletes by mistake something important /tons of
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| 14:06 | <alkisg> Hi markit, I have no experience with ZFS but I'm hearing good things about it; regarding LTSP, I don't expect it to take any impact, it should just work
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| 14:08 | <markit> I'm testing it in Proxmox, but seems that read performance is not that stellar without tuning
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| 14:08 | also I've consumer grade ssd that could weare out "fast" (but realistically, how many hours will be on that server I'm trying to upgrade?)
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| 14:10 | <alkisg> It's best if /home is on SSD. There too, I don't have a lot of experience, as most schools had HDDs
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| 14:10 | Root /, can be on HDD or slow ZFS or whatever without much impact to the clients, as it's cached in RAM anyway
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| 14:11 | <markit> I've read in the channel log that you are very busy until Agust, then LTSP will improve/evolve/bring new stuff again... looking forward it :) Also "multiseat"? Cool stuff (I've no pratical use myself, but always been fascinated by it)
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| 14:12 | <highvoltage> I ran LTSP (old LTSP 5 series) on ZFS for an office with about 40 desktops before
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| 14:12 | (storage on 4x HDD + 2x SSD as cache) and it ran quite well
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| 14:12 | <markit> highvoltage: I've a single Crucial 500GB sata ssh :)
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| 14:15 | <highvoltage> on my personal machines at home I use single SSDs for cache and performance is still great (as in, significantly better as any kind of HDD configuration without a cache backup)
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| 14:17 | <markit> highvoltage: I'm afraid of write wearout of consumer grade ssd
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| 14:17 | <highvoltage> as long as you can replace it at some point that's fine
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| 14:17 | you don't lose data when you lose your cache
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| 14:18 | I work a variety of SSDs quite hard and haven't had one fail in ages
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| 14:18 | <markit> highvoltage: sure, I mean me that have only one ssd, not as cache, but as "the one the only one" disk
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| 14:18 | <highvoltage> markit: oh yeah, that would be bad :)
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| 14:19 | in zfs you can use your usual disks in mirror and add the SSD as cache (then when it reads data from the disks, it also goes to the SSD, and future reads happen from there, also drastically speeding up writes to your main disks)
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| 14:19 | that's my usual minimum setup when it comes to zfs
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| 14:21 | <markit> highvoltage: I'm configuring my new proxmox server with ZFS, it's really cool
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| 14:21 | * markit just reading that Kubuntu has no installer with ZFS option, should install ubuntu server then add kde packages... too much work, amybe for 22.04 :) | |
| 15:41 | <markit> alkisg: I'm still confused by the "server" name of ltsp. My server name is kub2040, do I have to put also "server" in /etc/hosts? I see it in nfs home config so I think clients have to resolve it to 192.168.67.1 and not my "wan" IP
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| 15:41 | or it's automagically done by ltsp scripts? Any config to bind "server" to "client interface ip"?
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| 17:05 | <alkisg> markit: the server name, "server", is automagically done by ltsp scripts
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| 17:05 | No matter what the server actual name is
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| 17:05 | This is needed for many things, e.g. for the SSH keys to work even if the server IP or hostname change
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| 17:06 | So an entry for "server" will always exist in the client's /etc/hosts
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| 17:07 | <markit> alkisg: thanks a lot :) Is this true also if I've a "one nic" config?
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| 17:09 | <alkisg> Yes
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| 17:15 | <markit> (btw, I'm "migrating" from 16.04 - 32 to 20.04 - 64 bit (reinstalling and then importing accounts and so on), doing the work in a VM (so I can snapshot often) and then creating (qemu-img convert -f qcow2 -O raw my-qcow2.img /dev/sdb) to the ssd of the school's server. Is very time consuming, let's hope everything will work)
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