Date: Tue, 10 Jul 2018 17:13:47 +0200 From: Oliver Sech <crimsonthunder@gmx.net> To: FreeBSD-scsi <freebsd-scsi@freebsd.org> Subject: Re: problems with SAS JBODs 2 Message-ID: <b785fe02-9242-c95f-56cb-2130f90e17f5@gmx.net> In-Reply-To: <237f77ab-89e2-188b-b2b1-84c6d88609b0@gmx.net> References: <trinity-14d18077-ea73-40f6-9e87-d2d4000b1f7e-1530620937871@3c-app-gmx-bs01> <CAOtMX2h8r31AeNCKyckK2P0VLn1CKFogo9bWom2So1x2ngpa4A@mail.gmail.com> <237f77ab-89e2-188b-b2b1-84c6d88609b0@gmx.net>
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I tested a few additional things. I don't think this is a multipath, daisy chain nor a SAS wide ports problem. I can reproduce the problem with just a single connection to an Expander/JBOD. Test: * physically disconnect all shelves * reboot system * connect one shelf via SAS cable * check number of disks (after a reboot everything always shows up) * disconnect the shelf and wait (geom disk list still shows most disks.) * connect the shelf (missing disks) Tested Hardware: * Supermicro SAS3 847E2C-R1K28JBOD + SAS3 LSI 9305-16e ( internal daisy chain + wide links) * Supermicro SAS3 847E2C-R1K28JBOD + SAS3 LSI 9305-16e (straight HBA <-> EXPANDER connection. (no wide links, no daisy chain)) * Supermicro SAS2 SC847E26-RJBOD1 + SAS3 LSI 9305-16e (internal daisy chain) * Promise SAS2 VTrak 830 + SAS3 LSI 9305-16e (straight HBA <-> EXPANDER connection.) On 07/04/2018 12:15 PM, Oliver Sech wrote: >> 1) Are the expanders daisy chained? Some SAS expanders don't work reliably >> when daisy chained. Best to direct connect each one to the server. > At the moment I have 1 JBOD connected to 1 HBA Port with 1 cable (4 lanes?). > Unfortunately the JBOD has 24 slots in the front and 20 in the back and, those are connected via a internal SAS daisy chaining. > I could rewire and connect each backplane directly to the server, but unfortunately I do not have enough ports.. > > JOBD Model: Supermicro 847E2C-R1K28JBOD > >> 2) Are the expanders connected in multipath or single path? You need >> geom_multipath if you're going to do that. > See answer 1. There is a single path from the host to the first expander. > >> 3) Are you attempting to use wide ports (two SAS cables connecting each >> expander to the HBA). If do, you'll need to make sure that each pair of >> SAS cables goes to the same HBA chip (not merely the same card, as some >> cards contain two HBA chips). > see 1. The last time I opened one of those JBODs there were 8 SAS cables between the Front and Back expander. I assume that wide ports are being used. > (2 expanders per backplane as well) > >> 4) Are you trying to remove an expander while ZFS is active on that >> expander? That will suspend your pool, and ZFS doesn't always recover from >> a suspended state. > I'm testing with a new unused disk shelf that was never part of the ZFS pool. There were > _______________________________________________ > freebsd-scsi@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-scsi > To unsubscribe, send any mail to "freebsd-scsi-unsubscribe@freebsd.org"
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