>>>>> "James" == James Bottomley <James.Bottomley@xxxxxxxxxxxx> writes:
Thank you for looking into this with me, I really appreciate it. I'm
kinda stumped why this suddenly started happening, but it could be
hardware related of course...
James> So basically the problem is on scsi1 with the tape device, which
James> apparently negotiates only narrow async?
It's not a performance problem, it's a lockup problem. I use bacula
to make my backups using the DLT7000 as my media. But the tape drives
hangs, it's hung now so that I can't do my backups.
James> What do the domain validation messages say about this device?
James> They should be in dmesg. I'm fairly certain that DLT tapes do
James> better than narrow async.
The drive should be able to do 10MBytes/sec to the interface, the
drive itself can only do 5Mbytes/sec to the media, but with 2:1
compression and an 8MB buffer on the drive, it likes to be fed data as
quickly as it can.
Here's the validation results for my two disks and tape drive:
scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.36
<Adaptec aic7890/91 Ultra2 SCSI adapter>
aic7890/91: Ultra2 Wide Channel A, SCSI Id=7, 32/253 SCBs
target0:0:0: asynchronous.
Vendor: COMPAQ Model: HC01841729 Rev: 3208
Type: Direct-Access ANSI SCSI revision: 02
scsi0:A:0:0: Tagged Queuing enabled. Depth 32
target0:0:0: Beginning Domain Validation
target0:0:0: wide asynchronous.
target0:0:0: Domain Validation skipping write tests
target0:0:0: FAST-20 WIDE SCSI 40.0 MB/s ST (50 ns, offset 15)
target0:0:0: Ending Domain Validation
Vendor: COMPAQ Model: BD018222CA Rev: B016
Type: Direct-Access ANSI SCSI revision: 02
target0:0:1: asynchronous.
scsi0:A:1:0: Tagged Queuing enabled. Depth 32
target0:0:1: Beginning Domain Validation
target0:0:1: wide asynchronous.
target0:0:1: Domain Validation skipping write tests
target0:0:1: FAST-20 WIDE SCSI 40.0 MB/s ST (50 ns, offset 63)
target0:0:1: Ending Domain Validation
scsi1 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.36
<Adaptec aic7880 Ultra SCSI adapter>
aic7880: Ultra Wide Channel A, SCSI Id=7, 16/253 SCBs
Vendor: SUN Model: DLT7000 Rev: 1E48
Type: Sequential-Access ANSI SCSI revision: 02
target1:0:6: asynchronous.
target1:0:6: Beginning Domain Validation
target1:0:6: wide asynchronous.
target1:0:6: Domain Validation skipping write tests
target1:0:6: FAST-10 WIDE SCSI 20.0 MB/s ST (100 ns, offset 8)
target1:0:6: Ending Domain Validation
st: Version 20050501, fixed bufsize 32768, s/g segs 256
Attached scsi tape st0 at scsi1, channel 0, id 6, lun 0
st0: try direct i/o: yes (alignment 512 B), max page reachable by HBA 1048575
SCSI device sda: 35566000 512-byte hdwr sectors (18210 MB)
SCSI device sda: drive cache: write through
SCSI device sda: 35566000 512-byte hdwr sectors (18210 MB)
SCSI device sda: drive cache: write through
sda: sda1 sda2 sda3 sda4 < sda5 sda6 >
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
SCSI device sdb: 35565080 512-byte hdwr sectors (18209 MB)
SCSI device sdb: drive cache: write through
SCSI device sdb: 35565080 512-byte hdwr sectors (18209 MB)
SCSI device sdb: drive cache: write through
sdb: sdb1 sdb2 sdb3 sdb4 < sdb5 >
Attached scsi disk sdb at scsi0, channel 0, id 1, lun 0
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