aic7xxx support for >2TB volumes?

Kilian CAVALOTTI
2005-11-16T11:08:04Z

Hi all,

After some searching through newgroups and mailing lists, I haven't really
found an answer to the question: is the aic7xxx driver capable of supporting
larger than 2 terabytes volumes? I have read some success reports, but some
failed attempts too...

I actually have an external RAID array, hosting a 6TB virtual disk, plugged on
an Adaptec 39160 SCSI card. I'm using a 2.6.14 kernel, with CONFIG_LBD=y,
and thus, the aic7xxx (ver 7.0) module.

My dmesg show the following:

scsi1 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 7.0
<Adaptec 3960D Ultra160 SCSI adapter>
aic7899: Ultra160 Wide Channel A, SCSI Id=7, 32/253 SCBs
Vendor: transtec Model: T6100S16R1-D Rev: 342J
Type: Direct-Access ANSI SCSI revision: 05
scsi1:A:0:0: Tagged Queuing enabled. Depth 32
target1:0:0: Beginning Domain Validation
target1:0:0: wide asynchronous.
target1:0:0: FAST-80 WIDE SCSI 160.0 MB/s DT (12.5 ns, offset 127)
target1:0:0: Ending Domain Validation
sdb : very big device. try to use READ CAPACITY(16).
sdb : READ CAPACITY(16) failed.
sdb : status=0, message=00, host=5, driver=00
sdb : use 0xffffffff as device size
SCSI device sdb: 4294967296 512-byte hdwr sectors (2199023 MB)
SCSI device sdb: drive cache: write back
sdb : very big device. try to use READ CAPACITY(16).
sdb : READ CAPACITY(16) failed.
sdb : status=0, message=00, host=5, driver=00
sdb : use 0xffffffff as device size
SCSI device sdb: 4294967296 512-byte hdwr sectors (2199023 MB)
SCSI device sdb: drive cache: write back
sdb: unknown partition table
Attached scsi disk sdb at scsi1, channel 0, id 0, lun 0
Attached scsi generic sg2 at scsi1, channel 0, id 0, lun 0, type 0

Whatever the real size of the volume, it always give a "4294967296 512-byte
hdwr sectors (2199023 MB)" device...

Is there a way to support a >2TB volume on this SCSI controler? I know I could
split my volume in smaller ones and use LVM to reassemble them, but I'd like
to avoid adding overhead to the storage stack, and keep it the simplest.

Thanks in advance for any hint/advice,
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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