Date: Tue, 20 Jun 2006 22:20:37 -0500 From: Eric Anderson <anderson@centtech.com> To: Scott Long <scottl@samsco.org> Cc: freebsd-fs@freebsd.org, Ensel Sharon <user@dhp.com>, freebsd-questions@freebsd.org Subject: Re: Please help - adaptec 2820sa not ... RESOLVED Message-ID: <4498BB05.9020006@centtech.com> In-Reply-To: <4496CEBB.4020200@samsco.org> References: <Pine.LNX.4.21.0606182137270.12027-100000@shell.dhp.com> <449606B8.5080106@centtech.com> <4496CEBB.4020200@samsco.org>
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Scott Long wrote: > Eric Anderson wrote: >> Ensel Sharon wrote: >> >>> >>> On Mon, 19 Jun 2006, Jahilliya wrote: >>> >>>>> Ok, aac is in the dmesg. >>>>> >>>>> I can see both 2820sa cards in the dmesg, and I see no errors, etc. - >>>>> there are just no drives listed in dmesg. >>>>> >>>>> My setup is 8 500 Gb drives in a single raid-6 array, size ~2.8TB. >>>>> Any >>>>> problems with that ? Perhaps sysinstall cannot deal with a >2TB drive >>>>> ? There are no other drives in the system besides the single 2.8TB >>>>> raid 6 >>>>> array ... >>>>> >>>> Have you got any other drives you can attach to the raid? >>>> >>>> If so, disconnect the 8 drives connected, connect up a couple that are >>>> not part of the raid and configure them as a simple raid 1 and see if >>>> the installers sees that raid. Or try any combination in drives to >>>> bring the raid size down below 2TB (I'm sure this limitation has been >>>> fixed.) >>> >>> >>> >>> Ok, the answer is that it has not been fixed. >>> >>> 6.1 sysinstall does in fact see both 2820sa controllers, and when I >>> put in >>> a single 160GB sata drive, it does see that single drive and I can >>> install >>> onto it, etc. >>> >>> Sysinstall does _not_ see my 2.7TB raid6 array. I suspect that if it >>> were >>> smaller than 2TB, it would see it correctly. >>> >>> I have a number of options with which to deal with this, all of which >>> involve either wasting money or wasting disk space. Fantastic. >> >> >> Right - FreeBSD doesn't recognize >2TB LUNs. > > Wrong on several counts. First, the AAC driver does not present arrays > to the system as SCSI LUNs. The traditional 2TB limit with 12 byte CDB > issue simply doesn't exist with this driver. Second, the FreeBSD SCSI > layer knows how to issue 16 byte CDBs to access >2TB, assuming that the > target understands the 16-byte protocol. So no, there is no 2TB limit > inherent to FreeBSD. The only limit is with individual drivers and with > hardware. > > Scott Scott, thanks for correcting me on this. I was under the (false) impression that this was a FreeBSD SCSI issue, not a driver issue. I had tried this with QLogic fiber (fabric) storage in the past, and had issues, so I incorrectly thought that the information I had was true. Is it difficult to make drivers (such as the qlogic isp driver) handle >2TB devices? Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology Anything that works is better than anything that doesn't. ------------------------------------------------------------------------
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