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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. whitequark‏ @whitequark 26 Mar 2018
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      this PCIe card, mind you, SATA III 6 Gbps, in theory at least, offers you a way to switch between internal and external SATA ports. jumpers. routing the SATA data lanes around. I bet the signal integrity is 👌pic.twitter.com/aKMbjdlCGM

      3 replies 2 retweets 33 likes
      Show this thread
    2. Hector Martin‏ @marcan42 26 Mar 2018
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      Replying to @whitequark

      Let's just say I've had... not so great experiences with Marvell SATA/SAS controllers. I switched to an LSI SAS2008-based card for good reason. Marvell works... most of the time... if nothing goes wrong. Usually.

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

      yyyyeah I'm probably going to return the SAS controller I bought from newegg without even unpacking it and get an LSI one instead

      1 reply 0 retweets 1 like
    4. 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
    5. 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
    6. 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
    7. 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
    8. whitequark‏ @whitequark 26 Mar 2018
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      Replying to @marcan42

      how... how can a firmware NOT support drives in JBOD mode? that doesn't make any sense!

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

      Oh, it did, with an unsupported config option. It just didn't support hotplugging properly. The whole card crashed when you removed or added a drive. Welcome to shitty RAID firmware.

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

      I'm uh... speechless I think I understand now why Google just decommissions entire servers when enough drives fail, it's not worth pulling your hair in this hardware vendor-infested firmware/driver hellscape

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 26 Mar 2018
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      Replying to @whitequark

      Nah, Google swaps drives. They design their own backplanes and pick their own HBA chips. They don't deal with any of this nonsense. They don't use RAID, neither hardware nor software. It's straight drives to the OS.

      7:14 PM - 26 Mar 2018
      1 reply 0 retweets 1 like
        1. whitequark‏ @whitequark 26 Mar 2018
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          Replying to @marcan42

          I may have been reading their materials from before they designed their own hardware

          0 replies 0 retweets 1 like
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