Date: Mon, 07 Feb 2022 12:29:32 +0000 From: Jamie Landeg-Jones <jamie@catflap.org> To: freebsd-current@FreeBSD.org Subject: Re: USB Disk Stalls on -current Message-ID: <202202071229.217CTWBe072476@donotpassgo.dyslexicfish.net> In-Reply-To: <CAD2Ti28KcLcaVaKRk4PVUNKwU-bMgFZe4wydAb6e5G4vetbf1Q@mail.gmail.com> References: <7e8459e4-d708-7750-402c-cda2adf6199f@freebsd.org> <CANCZdfqG-%2B9dfFz-%2BeezZaqbPQN5-mQpw%2B214CkiKC%2B_kmW2ig@mail.gmail.com> <60ebd011-c2b8-3524-1476-123f11128ffe@freebsd.org> <CAD2Ti2_WP8y9tADUYjH5PykPm8oJyqRjrj-%2Bk_xHU99kFbWNxw@mail.gmail.com> <CANCZdfp62bbVNJ=VuD3VaOtPpVLPrMg9jaEha6tw33vfWXRDJA@mail.gmail.com> <CAD2Ti28KcLcaVaKRk4PVUNKwU-bMgFZe4wydAb6e5G4vetbf1Q@mail.gmail.com>
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grarpamp <grarpamp@gmail.com> wrote: > Yes, some USB hw is very flaky, > but ZFS can work great on these... For what it's worth, I have had for 2.5 years, tracking stable, a NAS hanging off a single NUC usb port, with 14 hard disks, 12 of which are used for 2 ZFS, spools, of two 3X2 mirror spools. Albeit, I'm using USB3 During heavy writes, I often get: [1429164] (da10:umass-sim10:10:0:0): WRITE(16). CDB: 8a 00 00 00 00 02 04 39 b2 80 00 00 01 00 00 00 [1429164] (da10:umass-sim10:10:0:0): CAM status: CCB request completed with an error [1429164] (da10:umass-sim10:10:0:0): Retrying command, 14 more tries remain , but with no errors or timeouts. I scrub regularly etc. It rarely has to attempt a retry more than once (although I did bump "kern.cam.da.retry_count" up to 15 a while back while dealing with another issue, and never changed it back) I only get about 300MB/s maximum on file reads though, but the current USB daisychaining I use isn't ideal. (Each raw disk individually give 150MB/s) The only issue I have is occasionally the main USB hub craps out, and all the disks disappear for a few seconds. When it recovers, and the OS sees the disks again, things remain weird until a reboot. cheers, Jamie
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