On Mon, Jun 29, 2009 at 03:08:35PM +0200, Tomasz Torcz wrote: > recently I've acquired Infortrend EonStor A16U-G2421 array > with 16x 500GB SATA drives inside. It is connected via: > 04:00.0 SCSI storage controller: Adaptec AHA-2940U2/U2W > to host running Fedora 12 with following kernel: > 2.6.31-0.33.rc1.git2.fc12.x86_64 > > When I export LUN >2TB from array I got following errors: > > scsi 5:0:0:1: Direct-Access VW VRU1610 347G PQ: 0 ANSI: 5 > scsi target5:0:0: FAST-40 WIDE SCSI 80.0 MB/s ST (25 ns, offset 127) > scsi5:A:0:1: Tagged Queuing enabled. Depth 4 > sd 5:0:0:1: Attached scsi generic sg3 type 0 > sd 5:0:0:1: [sdd] READ CAPACITY(16) failed > sd 5:0:0:1: [sdd] Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK > sd 5:0:0:1: [sdd] Sense not available. > > According to manufacturer, this array supports LUNs up to 64TB, > although >2TB LUNs require enigmatic ,,support from OS side''. > I was under impression that aic7xxx supports them, but it seems > not true. What can I tweak on the Linux side to use 6TB volumes? SCSI commands come in different sizes. Drivers are assumed to support commands up to 12 bytes long, unless they report otherwise by setting their max_cmd_len parameter. Unfortunately, the command that reports the device capacity for devices over 2TB is a 16 byte command, and the aic7xxx driver doesn't claim it supports 16 byte commands, so we refuse to even send it to the driver. It's possible the aic7xxx hardware does support 16 byte commands. If so, this is an easy fix. If it doesn't, you could try replacing the card with one that does (for example, the LSI 8xx and 10xx cards all support 16 byte commands). You could also go for a configuration fix where you reconfigure the array with LUNs below 2TB and then use MD or DM to stitch them back together into a single device. Let's hope someone who understands the aic7xxx hardware can tell us whether it supports 16 byte commands or not. -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
