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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 26 Mar 2018
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      Replying to @whitequark

      If you're going the LSI route, try to get a basic HBA with IT/IR firmware (or that you know for a fact can be crossflashed from iMR mode). Those usually work best. Avoid Dell PERC. IBM M1015 is usually fine (& cheap and available) but you'll want to crossflash it.

      2 replies 0 retweets 3 likes
    2. Hector Martin‏ @marcan42 26 Mar 2018
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      Replying to @marcan42 @whitequark

      TL;DR LSI sold the same chip with two completely different firmwares, PCI IDs, programming interfaces and drivers - one for full-blown hardware managed RAID (iMR) and one for a simple HBA (IT), optionally with basic RAID0/1 support (IR). You can switch with some effort.

      1 reply 0 retweets 4 likes
    3. whitequark‏ @whitequark 26 Mar 2018
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      Replying to @marcan42

      oh! yeah, I've already learned to avoid hardware RAID like Superfund sites.

      1 reply 0 retweets 5 likes
    4. Hector Martin‏ @marcan42 26 Mar 2018
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      Replying to @whitequark

      Here's my little horror story with a less-than-popular LSI card. These things work great once you get the right firmware on them, but getting there can be tricky depending on the model.https://marcan.st/2016/05/crossflashing-the-fujitsu-d2607/ …

      4 replies 4 retweets 17 likes
    5. whitequark‏ @whitequark 26 Mar 2018
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      Replying to @marcan42

      the... the card has a PowerPC CPU on it? (and MRAM? I didn't even know this is deployed in production) has anyone run Linux on it yet

      2 replies 1 retweet 3 likes
    6. R. Ou‏ @rqou_ 26 Mar 2018
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      Replying to @whitequark @marcan42

      Some "server-grade" Ethernet cards have an embedded CPU like that too (I don't remember if it was Intel, Broadcom, or Mellanox)

      1 reply 0 retweets 2 likes
    7. Hector Martin‏ @marcan42 26 Mar 2018
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      Replying to @rqou_ @whitequark

      I mean, you can run Linux on a HDD controller, so... Yeah, why not. http://spritesmods.com/?art=hddhack&page=1 …

      1 reply 0 retweets 3 likes
    8. whitequark‏ @whitequark 26 Mar 2018
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      Replying to @marcan42 @rqou_

      yeah, I know that one, but a SAS controller seems more fun. you know why? you could hack it into a 24 Gbps SASternet card if you could control transceivers

      3 replies 0 retweets 5 likes
    9. R. Ou‏ @rqou_ 26 Mar 2018
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      Replying to @whitequark @marcan42

      You know, "converged network" people usually try and do the opposite :P

      1 reply 0 retweets 0 likes
    10. whitequark‏ @whitequark 26 Mar 2018
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      Replying to @rqou_ @marcan42

      there's a russian proverb that describes this situation perfectly, but, fortunately, it's impossible to translate

      2 replies 0 retweets 6 likes
      Hector Martin‏ @marcan42 26 Mar 2018
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      Replying to @whitequark @rqou_

      Of course, you'd then use this new capability to run DRBD over the network link, using the HBAs both for the local disks and the distributed RAID. Bonus points for implementing DRBD in the firmware itself.

      7:33 PM - 26 Mar 2018
      • 3 Likes
      • R. Ou whitequark
      1 reply 0 retweets 3 likes
        1. New conversation
        1. Hector Martin‏ @marcan42 26 Mar 2018
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          Replying to @marcan42 @whitequark @rqou_

          Turns out target mode on these controllers is already a thing and you don't even need to hack the firmware. Ha.https://github.com/exactassembly/meta-xa-stm …

          1 reply 0 retweets 8 likes
        2. whitequark‏ @whitequark 26 Mar 2018
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          Replying to @marcan42 @rqou_

          this gives me ideas.

          1 reply 0 retweets 2 likes
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