Re: RFC: ATA to CAM integration patch (INTEL DX58SO)

At 05:30 PM 7/3/2009, Mike Tancsa wrote:
>At 03:31 PM 7/3/2009, Alexander Motin wrote:
>>It would be more interesting to investigate benefits on NCQ 
>>suitable workload, as that are new for us. Something like unpacking 
>>a lot of small files to normal or async-mounted or gjournalled FS, 
>>or some multi-threaded read, or something else. Would be nice to 
>>understand on which types of workload NCQ could give us visible effects.
>>
>>You can track real requests parallelism by looking on dev_active 
>>field of `camcontrol tags ada0 -v`.
>
>
>We dont have too many disk I/O bound apps here.  Where we do, we 
>typically have used raid controllers in RAID10.  But I will 
>experiment a little more over the weekend.  For us, we are 
>interested in large amounts of storage for backup purposes.  Having 
>things like port multiplier features are very nice to have.  But I 
>will try some random io tests to see if I can measure a difference.


I hooked up a Vantec eSata enclosure using a SATA to eSATA cable off 
the main motherboard.  One small difference I noticed is that 
camcontrol does not get the info from the drive like it does on other 
devices.  Perhaps thats the enclosure messing things up ?

0(ich10)# camcontrol identify ada2
pass2: < > ATA/ATAPI-0 device

Protocol              ATA/ATAPI revision 0
device model
serial number
firmware revision
cylinders             0
heads                 0
sectors/track         0
lba not supported
lba48 not supported
dma not supported
overlap not supported

Feature                      Support  Enable    Value           Vendor
write cache                    no       no
read ahead                     no       no
Tagged Command Queuing (TCQ)   no       no      0/0x00
SMART                          no       no
microcode download             no       no
security                       no       no
power management               no       no
advanced power management      no       no      0/0x00
automatic acoustic management  no       no      0/0x00  0/0x00
0(ich10)#

0(ich10)# camcontrol identify ada1
pass1: <ST380811AS 3.AAE> ATA/ATAPI-7 SATA 2.x device

Protocol              SATA revision 2.x
device model          ST380811AS
serial number         6PS03G9Z
firmware revision     3.AAE
cylinders             16383
heads                 16
sectors/track         63
lba supported         156301488 sectors
lba48 supported       156301488 sectors
dma supported
overlap not supported

Feature                      Support  Enable    Value           Vendor
write cache                    yes      yes
read ahead                     yes      yes
Native Command Queuing (NCQ)   yes       -      31/0x1F
Tagged Command Queuing (TCQ)   no       no      31/0x1F
SMART                          yes      yes
microcode download             yes      yes
security                       yes      no
power management               yes      yes
advanced power management      no       no      65278/0xFEFE
automatic acoustic management  no       no      0/0x00  208/0xD0
0(ich10)# camcontrol identify ada0
pass0: <ST3500410AS CC34> ATA/ATAPI-8 SATA 2.x device

Protocol              SATA revision 2.x
device model          ST3500410AS
serial number         5VM0X6FG
firmware revision     CC34
cylinders             16383
heads                 16
sectors/track         63
lba supported         268435455 sectors
lba48 supported       976773168 sectors
dma supported
overlap not supported

Feature                      Support  Enable    Value           Vendor
write cache                    yes      yes
read ahead                     yes      yes
Native Command Queuing (NCQ)   yes       -      31/0x1F
Tagged Command Queuing (TCQ)   no       no      31/0x1F
SMART                          yes      yes
microcode download             yes      yes
security                       yes      no
power management               yes      yes
advanced power management      no       no      0/0x00
automatic acoustic management  yes      yes     0/0x00  254/0xFE
0(ich10)#

There was a previous drive connected.  We powered off the external 
drive, disconnected the cable, hooked up the new drive, powered up 
the enclosure and then I did a camcontrol rescan all

Jul  4 20:19:22 ich10 kernel: (ada2:ahcich2:0:0:0): lost device
Jul  4 20:19:22 ich10 kernel: (ada2:ahcich2:0:0:0): removing device entry
Jul  4 20:19:37 ich10 kernel: (probe0:ahcich2:0:0:0): SIGNATURE: 0000
Jul  4 20:19:37 ich10 kernel: ada2 at ahcich2 bus 0 target 0 lun 0
Jul  4 20:19:37 ich10 kernel: ada2: <ST3750330AS SD15> ATA/ATAPI-8 
SATA 1.x device
Jul  4 20:19:37 ich10 kernel: ada2: 150.000MB/s transfers
Jul  4 20:19:37 ich10 kernel: ada2: 715404MB (1465149168 512 byte 
sectors: 16H 63S/T 16383C)
Jul  4 20:19:37 ich10 kernel: ada2: Native Command Queueing Enabled

The drive we connected has some bad sectors, so I wanted to try a 
secure wipe as much as possible before RMAing the drive.  I also 
thought it would be useful to test with the new driver how it handles bad disks

Is this such an error ?

Jul  4 20:25:57 ich10 kernel: ahcich2: ahci_ch_intr ERROR is 40000001 
cs 00000004 ss 00000000 rs 00000004 tfd 451 serr 00000000

         ---Mike