Re: aic7xxx support for >2TB volumes?

Kilian CAVALOTTI
2005-11-19T14:57:16Z

On Saturday 19 November 2005 02:32, Douglas Gilbert wrote:
> Here are the test results for that patch. They indicate
> that the READ_CAPACITY(16) is getting to the disk (which
> doesn't support it since its capacity is 18 GB).

So it seems promising. :)

FYI, I had reports from users who said to be able to use a >2TB external
storage array (different vendor) with that same 39160 Adaptec HBA.

Here's part of their dmesg:
scsi4 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.36
<Adaptec 3960D Ultra160 SCSI adapter>
aic7899: Ultra160 Wide Channel A, SCSI Id=7, 32/253 SCBs
(scsi4:A:0): 160.000MB/s transfers (80.000MHz DT, offset 62, 16bit)
Type:   Direct-Access                      ANSI SCSI revision: 03
scsi4:A:0:0: Tagged Queuing enabled.  Depth 4
SCSI device sdg: 2686132224 1024-byte hdwr sectors (2750599 MB)
SCSI device sdg: drive cache: write back
sdg: unknown partition table
Attached scsi disk sdg at scsi4, channel 0, id 0, lun 0

The weird part is that the driver does not even seem to invoke READ
CAPACITY(16) command, but directly succeed in getting device size.

To sum up my experiences so far:
--------------------|----------------|---------------|--------------------------
Ext. device (>2TB) | HBA | Driver | Result
--------------------|----------------|---------------|--------------------------
Infortrend EonStore | Adaptec 39160 | aic7xxx | READ CAPACITY(16) fails
A16U-G1410 | | |
--------------------|----------------|---------------|--------------------------
Infortrend EonStore | LSI Logic U320 | mptbase | READ CAPACITY(16)
A16U-G1410 | | | success
--------------------|----------------|---------------|--------------------------
Proware | Adaptec 39160 | aic7xxx | Direct success
--------------------|----------------|---------------|--------------------------

So it seems to come from both the external device and the aic7xxx driver,since
the EonStore works with another HBA, and the aic7xxx works with another
device...

It seems quite strange to me, but I hope gurus here will have a rational
explanation. :)

Best regards,
--
Kilian CAVALOTTI Administrateur réseaux et systèmes
UPMC / CNRS - LIP6 (C870)
8, rue du Capitaine Scott Tel. : 01 44 27 88 54
75015 Paris - France Fax. : 01 44 27 70 00
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