<kc8apf>
He's taking me up on my offer to build a language server
<mithro>
kc8apf: Cool! Interested to see were it goes
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<reportingsjr>
Hmm, do you all think the RAM requirements of ZFS are worth it vs software raid for a home storage server?
<catplant>
zfs is worth it
<reportingsjr>
I have a 5TB zfs array right now and 16GB of ram, but I just received 4x 8TB drives and don't really have the cash to blow on 32GB+ of RAM.
<zkms>
why would you need 32GB of RAM
<reportingsjr>
zkms: the rule of thumb for good zfs performance is 1GB ram for every TB of physical disk
<qu1j0t3>
reportingsjr: yes, it's worth it
<zkms>
that rule is afaict nonsense.
<reportingsjr>
zkms: I know you can go lower, I'm kinda curious how low you can go.
* qu1j0t3
used to run ZFS on a 2gb solaris 10 machine, but at the time i think the recommended min was 4gb
* qu1j0t3
didn't have any problems however
<zkms>
Do you know where that rule comes from or what conditions it's meant to apply in?
<qu1j0t3>
reportingsjr: you should have no trouble whatsoever with 16gb
<zkms>
^
<qu1j0t3>
reportingsjr: (as long as you're not using dedup, that's a different ballgame, but you really don't want dedup)
<zkms>
^
<reportingsjr>
zkms: I haven't looked that much in to it, because I've got better things to do, but from what I recall it is recommended for some of the error correction stuff and other features
<qu1j0t3>
reportingsjr: honestly, 16gb is ample.
<qu1j0t3>
reportingsjr: and yes, zfs is worth it
<reportingsjr>
ahhh, so if you don't do dedupe you don't need it?
<zkms>
the "error correction stuff" is an on-disk format thing, and has nothing to do with the amount of RAM that you have.
<qu1j0t3>
reportingsjr: right. zfs will adapt well to how much ram you have.
<zkms>
and yes if you're not doing something silly with dedup or whatever that rule is /bullshit/
<reportingsjr>
zkms: I thought zfs did software error correction?
<zkms>
you can safely ignore it.
<zkms>
it does checksumming but that has *literally nothing* to do with how much RAM you have!
<qu1j0t3>
reportingsjr: it does, but as zkms said, it dosn't impose ram pressure
<zkms>
literally **nothing**
<reportingsjr>
ok
<zkms>
so yes feel free to use ZFS
<reportingsjr>
This is slightly more complicated than this since I have an absolutely goofed up setup
<zkms>
16GB is more than fine
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<reportingsjr>
this "storage server" is actually my desktop, so I don't really have 16GB of free RAM. :P
<zkms>
i mean sure if you want lots of stuff to stay cached in RAM so you can access it faster than fetching from the disk, yes, more RAM will help with that
<zkms>
but that's not ZFS-specific
<reportingsjr>
Nah, I don't particularly need that
<reportingsjr>
alrighty then, I think I know what I need now :)
<reportingsjr>
thanks!
<zkms>
no worries and yeah I would recommend using ZFS if only for data durability concerns
<reportingsjr>
yeah, that's the main reason I want to use it
<reportingsjr>
plus it sounds way easier to deal with than hardware/software raid
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<SolraBizna>
don't use ZFS with less than 1GB of RAM and don't use it on a single device and you won't be sorry
<qu1j0t3>
reportingsjr: it's better in every way
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<tpw-rules>
zfs is excellent
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<tpw_rules>
anybody have experience with hard processor systems? i've got a cyclone v-soc and something's going wrong in my FPGA fabric causing the hps to lock up and dump something about unknown IPI message out the console