Date: Thu, 14 Nov 2013 11:49:24 +0100 From: Borja Marcos <borjam@sarenet.es> To: Shawn Wallbridge <shawn.wallbridge@imaginaryforces.com> Cc: "freebsd-fs@FreeBSD.org" <freebsd-fs@FreeBSD.org> Subject: Re: Controller for ZFS Message-ID: <49F719A9-AC50-4917-8809-F51EBD4F5D0F@sarenet.es> In-Reply-To: <CEA907F4.12261%shawn.wallbridge@imaginaryforces.com> References: <CEA907F4.12261%shawn.wallbridge@imaginaryforces.com>
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On Nov 13, 2013, at 7:41 PM, Shawn Wallbridge wrote: > I was wondering what the preferred/best supported 24port SAS/SATA > controller is for FreeBSD? I have a box with a LSI/3Ware 9750-24i4e in = it, > which I can use in JBOD mode, but it seems like a waste to me. Not only a waste, but a serious problem. You absolutely do not want a "JBOD mode" in which you create so-called = RAID0 1-drive logical volumes. You absolutely do want a silly and stupid HBA which just passes SAS/SATA = commands from the OS to the drives and back.=20 The "JBOD mode" offers a fake device in which the "intelligent" = controller makes its own decisions and, of course, hides the very important SAS/SATA status codes from the OS. ZFS knows better.=20 The one I use is sold by Dell as the "H200". They usually try to disuade = you by saying that it's not intelligent, doesn't offer RAID, some of their "configuration aids" even forbid it... I just = tell the salesman to shut up because I know much better than him. The only problem: beware if you are using a built-in backplane in the = server, some manufacturers insist on using different cabling schemes for different controllers and you could run into stupid = problems because of that. FreeBSD 10 identifies one of my cards as this one: mps0: <LSI SAS2008> port 0x7c00-0x7cff mem = 0xd4ff0000-0xd4ffffff,0xd4f80000-0xd4fbffff irq 80 at device 0.0 on = pci67 mps0: Firmware: 07.15.08.00, Driver: 16.00.00.00-fbsd mps0: IOCCapabilities: = 185c<ScsiTaskFull,DiagTrace,SnapBuf,EEDP,TransRetry,IR> Borja.
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