From owner-freebsd-scsi  Mon Jun 24 15:11:35 2002
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Date: Mon, 24 Jun 2002 15:11:30 -0700 (PDT)
From: Don Lewis <dl-freebsd@catspoiler.org>
Subject: SCSI timeouts under extreme load
To: scsi@FreeBSD.ORG
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I'm seeing SCSI timeouts when my disks are under extreme load.  When
this happens, iostat reports the activity in the range of 100 to 200
transfers per second or even more, which I suspect is mostly hitting the
disk cache.  I suspect that the problem is that the disk gets so busy
that it defers some commands indefinitely, and it looks like CAM
attempts to recover by resetting the device.  Typically something gets
wedged waiting for a page to get swapped in and the system becomes
totally unresponsive until CAM breaks out the big hammer.  I'm currently
running 4.6-STABLE, but I've been seeing this problem for the last
several months.

I think things might work more smoothly if the I/O service times were
tracked and I/O requests were throttled back if the service times
started getting unreasonably long or if any I/O requests were
outstanding an excessively long time.

From dmesg.boot:

ahc0: <Adaptec aic7890/91 Ultra2 SCSI adapter> port 0xd000-0xd0ff mem 0xe0000000
-0xe0000fff irq 5 at device 6.0 on pci0
aic7890/91: Ultra2 Wide Channel A, SCSI Id=7, 32/253 SCBs
sa0 at ahc0 bus 0 target 4 lun 0
sa0: <TANDBERG SLR5 4/8GB =09:> Removable Sequential Access SCSI-2 device
sa0: 3.300MB/s transfers
da1 at ahc0 bus 0 target 1 lun 0
da1: <SEAGATE ST336737LW 0105> Fixed Direct Access SCSI-3 device
da1: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing Enabled
da1: 35242MB (72176566 512 byte sectors: 255H 63S/T 4492C)
da0 at ahc0 bus 0 target 0 lun 0
da0: <SEAGATE ST39173LW 4292> Fixed Direct Access SCSI-2 device
da0: 80.000MB/s transfers (40.000MHz, offset 15, 16bit), Tagged Queueing Enabled
da0: 8683MB (17783240 512 byte sectors: 255H 63S/T 1106C)



Jun 24 02:15:20 mousie /kernel: swap_pager: indefinite wait buffer: device: #da/
0x20001, blkno: 67392, size: 4096
Jun 24 02:15:52 mousie /kernel: swap_pager: indefinite wait buffer: device: #da/
0x20001, blkno: 67392, size: 4096
Jun 24 02:15:52 mousie /kernel: (da0:ahc0:0:0:0): SCB 0x4 - timed out
Jun 24 02:15:52 mousie /kernel: ahc0: Dumping Card State while idle, at SEQADDR
0x9
Jun 24 02:15:52 mousie /kernel: ACCUM = 0x4, SINDEX = 0x64, DINDEX = 0x65, ARG_2
 = 0x3
Jun 24 02:15:53 mousie /kernel: HCNT = 0x0 SCBPTR = 0x10
Jun 24 02:15:53 mousie /kernel: SCSISEQ = 0x12, SBLKCTL = 0xa
Jun 24 02:15:53 mousie /kernel: DFCNTRL = 0x0, DFSTATUS = 0x89
Jun 24 02:15:53 mousie /kernel: LASTPHASE = 0x1, SCSISIGI = 0x0, SXFRCTL0 = 0x80
Jun 24 02:15:53 mousie /kernel: SSTAT0 = 0x0, SSTAT1 = 0xa
Jun 24 02:15:53 mousie /kernel: STACK == 0x3, 0x17b, 0x165, 0x0   
Jun 24 02:15:53 mousie /kernel: SCB count = 130
Jun 24 02:15:53 mousie /kernel: Kernel NEXTQSCB = 84
Jun 24 02:15:53 mousie /kernel: Card NEXTQSCB = 84
Jun 24 02:15:53 mousie /kernel: QINFIFO entries:
Jun 24 02:15:53 mousie /kernel: Waiting Queue entries:
Jun 24 02:15:53 mousie /kernel: Disconnected Queue entries: 16:14 23:2 2:3 15:9
24:47 20:59 0:109 31:49 25:16 22:4
Jun 24 02:15:53 mousie /kernel: QOUTFIFO entries:
Jun 24 02:15:53 mousie /kernel: Sequencer Free SCB List: 17 21 18 27 8 11 30 28
1 14 3 7 9 5 6 13 10 29 12 19 4 26
Jun 24 02:15:53 mousie /kernel: Sequencer SCB Info: 0(c 0x64, s 0x7, l 0, t 0x6d
) 1(c 0x60, s 0x7, l 0, t 0xff) 2(c 0x66, s 0x7, l 0, t 0x3) 3(c 0x60, s 0x7, l 
0, t 0xff) 4(c 0x60, s 0x7, l 0, t 0xff) 5(c 0x60, s 0x7, l 0, t 0xff) 6(c 0x60,
 s 0x7, l 0, t 0xff) 7(c 0x60, s 0x7, l 0, t 0xff) 8(c 0x60, s 0x7, l 0, t 0xff)
 9(c 0x60, s 0x7, l 0, t 0xff) 10(c 0x60, s 0x7, l 0, t 0xff) 11(c 0x60, s 0x7,
l 0, t 0xff) 12(c 0x60, s 0x7, l 0, t 0xff) 13(c 0x60, s 0x7, l 0, t 0xff) 14(c 
0x60, s 0x7, l 0, t 0xff) 15(c 0x64, s 0x7, l 0, t 0x9) 16(c 0x64, s 0x7, l 0, t
 0xe) 17(c 0x60, s 0x7, l 0, t 0xff) 18(c 0x60, s 0x7, l 0, t 0xff) 19(c 0x60, s
 0x7, l 0, t 0xff) 20(c 0x64, s 0x7, l 0, t 0x3b) 21(c 0x60, s 0x7, l 0, t 0xff)
 22(c 0x64, s 0x7, l 0, t 0x4) 23(c 0x64, s 0x7, l 0, t 0x2) 24(c 0x64, s 0x7, l
 0, t 0x2f) 25(c 0x66, s 0x7, l 0, t 0x10) 26(c 0x60, s 0x7, l 0, t 0xff) 27(c 0
x60, s 0x7, l 0, t 0xff) 28(c 0x60, s 0x7, l 0, t 0xff) 29(c 0x60, s 0x7, l 0, t
 0xff) 30(c 0x60, s 0x7, l 0, t 0xff) 31(c 0x64, s 0x7, l 0, t 0x31)
Jun 24 02:15:54 mousie /kernel: Pending list: 14(c 0x60, s 0x7, l 0), 2(c 0x60, 
s 0x7, l 0), 3(c 0x62, s 0x7, l 0), 9(c 0x60, s 0x7, l 0), 47(c 0x60, s 0x7, l 0
), 59(c 0x60, s 0x7, l 0), 109(c 0x60, s 0x7, l 0), 49(c 0x60, s 0x7, l 0), 16(c
 0x62, s 0x7, l 0), 4(c 0x60, s 0x7, l 0)
Jun 24 02:15:54 mousie /kernel: Kernel Free SCB list: 66 93 0 57 43 83 99 17 96 
29 10 56 35 42 65 15 117 19 31 67 115 33 51 101 21 37 39 103 40 13 50 52 94 7 18
 91 11 102 58 81 119 24 20 98 116 44 6 85 110 114 26 118 22 113 30 80 129 36 104
 97 92 5 38 105 12 54 107 28 46 112 108 1 100 82 48 95 27 90 32 45 55 8 25 68 41
 111 34 69 106 53 23 86 87 88 89 70 71 72 73 74 75 76 77 78 79 60 61 62 63 64 12
8 127 126 125 124 123 122 121 120
Jun 24 02:15:54 mousie /kernel: sg[0] - Addr 0x70ec000 : Length 4096
Jun 24 02:15:54 mousie /kernel: sg[1] - Addr 0x56ed000 : Length 4096
Jun 24 02:15:54 mousie /kernel: (da0:ahc0:0:0:0): Queuing a BDR SCB
Jun 24 02:15:54 mousie /kernel: (da0:ahc0:0:0:0): Bus Device Reset Message Sent
Jun 24 02:15:54 mousie /kernel: (da0:ahc0:0:0:0): no longer in timeout, status =
 34b
Jun 24 02:15:54 mousie /kernel: ahc0: Bus Device Reset on A:0. 10 SCBs aborted 



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From owner-freebsd-scsi  Tue Jun 25 22:21:58 2002
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Date: Tue, 25 Jun 2002 23:21:44 -0600
From: "Kenneth D. Merry" <ken@kdm.org>
To: Don Lewis <dl-freebsd@catspoiler.org>
Cc: scsi@FreeBSD.ORG
Subject: Re: SCSI timeouts under extreme load
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On Mon, Jun 24, 2002 at 15:11:30 -0700, Don Lewis wrote:
> I'm seeing SCSI timeouts when my disks are under extreme load.  When
> this happens, iostat reports the activity in the range of 100 to 200
> transfers per second or even more, which I suspect is mostly hitting the
> disk cache.  I suspect that the problem is that the disk gets so busy
> that it defers some commands indefinitely, and it looks like CAM
> attempts to recover by resetting the device.  Typically something gets
> wedged waiting for a page to get swapped in and the system becomes
> totally unresponsive until CAM breaks out the big hammer.  I'm currently
> running 4.6-STABLE, but I've been seeing this problem for the last
> several months.
> 
> I think things might work more smoothly if the I/O service times were
> tracked and I/O requests were throttled back if the service times
> started getting unreasonably long or if any I/O requests were
> outstanding an excessively long time.

That would be nice nice to have.

> >From dmesg.boot:
> 
> ahc0: <Adaptec aic7890/91 Ultra2 SCSI adapter> port 0xd000-0xd0ff mem 0xe0000000
> -0xe0000fff irq 5 at device 6.0 on pci0
> aic7890/91: Ultra2 Wide Channel A, SCSI Id=7, 32/253 SCBs
> sa0 at ahc0 bus 0 target 4 lun 0
> sa0: <TANDBERG SLR5 4/8GB =09:> Removable Sequential Access SCSI-2 device
> sa0: 3.300MB/s transfers
> da1 at ahc0 bus 0 target 1 lun 0
> da1: <SEAGATE ST336737LW 0105> Fixed Direct Access SCSI-3 device
> da1: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing Enabled
> da1: 35242MB (72176566 512 byte sectors: 255H 63S/T 4492C)
> da0 at ahc0 bus 0 target 0 lun 0
> da0: <SEAGATE ST39173LW 4292> Fixed Direct Access SCSI-2 device
> da0: 80.000MB/s transfers (40.000MHz, offset 15, 16bit), Tagged Queueing Enabled
> da0: 8683MB (17783240 512 byte sectors: 255H 63S/T 1106C)

Justin looked at the driver messages (below), and said that it doesn't
appear that there is anything wrong with the driver.  Rather it looks like
you're right about the cause -- the drive (da0) just isn't responding.
(Until we hit it with a BDR.)

My suggestion would be to reduce the number of outstanding tags on da0 with
'camcontrol tags'.  You'll have to see what the number of openings is, and
then perhaps reduce it from there and see if your problem goes away.

e.g.:

# camcontrol tags da1 -v
(pass1:ahc1:0:1:0): dev_openings  63
(pass1:ahc1:0:1:0): dev_active    0
(pass1:ahc1:0:1:0): devq_openings 63
(pass1:ahc1:0:1:0): devq_queued   0
(pass1:ahc1:0:1:0): held          0
(pass1:ahc1:0:1:0): mintags       2
(pass1:ahc1:0:1:0): maxtags       255
# camcontrol tags da1 -N 32 -v
(pass1:ahc1:0:1:0): tagged openings now 32
(pass1:ahc1:0:1:0): dev_openings  32
(pass1:ahc1:0:1:0): dev_active    0
(pass1:ahc1:0:1:0): devq_openings 32
(pass1:ahc1:0:1:0): devq_queued   0
(pass1:ahc1:0:1:0): held          0
(pass1:ahc1:0:1:0): mintags       2
(pass1:ahc1:0:1:0): maxtags       255

Another alternative would be to see if Seagate has any new firmware for
that drive.  They typically don't put firmware on their web site, so you'll
probably have to call Seagate tech support to get it.

> Jun 24 02:15:20 mousie /kernel: swap_pager: indefinite wait buffer: device: #da/
> 0x20001, blkno: 67392, size: 4096
> Jun 24 02:15:52 mousie /kernel: swap_pager: indefinite wait buffer: device: #da/
> 0x20001, blkno: 67392, size: 4096
> Jun 24 02:15:52 mousie /kernel: (da0:ahc0:0:0:0): SCB 0x4 - timed out
> Jun 24 02:15:52 mousie /kernel: ahc0: Dumping Card State while idle, at SEQADDR
> 0x9
> Jun 24 02:15:52 mousie /kernel: ACCUM = 0x4, SINDEX = 0x64, DINDEX = 0x65, ARG_2
>  = 0x3
> Jun 24 02:15:53 mousie /kernel: HCNT = 0x0 SCBPTR = 0x10
> Jun 24 02:15:53 mousie /kernel: SCSISEQ = 0x12, SBLKCTL = 0xa
> Jun 24 02:15:53 mousie /kernel: DFCNTRL = 0x0, DFSTATUS = 0x89
> Jun 24 02:15:53 mousie /kernel: LASTPHASE = 0x1, SCSISIGI = 0x0, SXFRCTL0 = 0x80
> Jun 24 02:15:53 mousie /kernel: SSTAT0 = 0x0, SSTAT1 = 0xa
> Jun 24 02:15:53 mousie /kernel: STACK == 0x3, 0x17b, 0x165, 0x0   
> Jun 24 02:15:53 mousie /kernel: SCB count = 130
> Jun 24 02:15:53 mousie /kernel: Kernel NEXTQSCB = 84
> Jun 24 02:15:53 mousie /kernel: Card NEXTQSCB = 84
> Jun 24 02:15:53 mousie /kernel: QINFIFO entries:
> Jun 24 02:15:53 mousie /kernel: Waiting Queue entries:
> Jun 24 02:15:53 mousie /kernel: Disconnected Queue entries: 16:14 23:2 2:3 15:9
> 24:47 20:59 0:109 31:49 25:16 22:4
> Jun 24 02:15:53 mousie /kernel: QOUTFIFO entries:
> Jun 24 02:15:53 mousie /kernel: Sequencer Free SCB List: 17 21 18 27 8 11 30 28
> 1 14 3 7 9 5 6 13 10 29 12 19 4 26
> Jun 24 02:15:53 mousie /kernel: Sequencer SCB Info: 0(c 0x64, s 0x7, l 0, t 0x6d
> ) 1(c 0x60, s 0x7, l 0, t 0xff) 2(c 0x66, s 0x7, l 0, t 0x3) 3(c 0x60, s 0x7, l 
> 0, t 0xff) 4(c 0x60, s 0x7, l 0, t 0xff) 5(c 0x60, s 0x7, l 0, t 0xff) 6(c 0x60,
>  s 0x7, l 0, t 0xff) 7(c 0x60, s 0x7, l 0, t 0xff) 8(c 0x60, s 0x7, l 0, t 0xff)
>  9(c 0x60, s 0x7, l 0, t 0xff) 10(c 0x60, s 0x7, l 0, t 0xff) 11(c 0x60, s 0x7,
> l 0, t 0xff) 12(c 0x60, s 0x7, l 0, t 0xff) 13(c 0x60, s 0x7, l 0, t 0xff) 14(c 
> 0x60, s 0x7, l 0, t 0xff) 15(c 0x64, s 0x7, l 0, t 0x9) 16(c 0x64, s 0x7, l 0, t
>  0xe) 17(c 0x60, s 0x7, l 0, t 0xff) 18(c 0x60, s 0x7, l 0, t 0xff) 19(c 0x60, s
>  0x7, l 0, t 0xff) 20(c 0x64, s 0x7, l 0, t 0x3b) 21(c 0x60, s 0x7, l 0, t 0xff)
>  22(c 0x64, s 0x7, l 0, t 0x4) 23(c 0x64, s 0x7, l 0, t 0x2) 24(c 0x64, s 0x7, l
>  0, t 0x2f) 25(c 0x66, s 0x7, l 0, t 0x10) 26(c 0x60, s 0x7, l 0, t 0xff) 27(c 0
> x60, s 0x7, l 0, t 0xff) 28(c 0x60, s 0x7, l 0, t 0xff) 29(c 0x60, s 0x7, l 0, t
>  0xff) 30(c 0x60, s 0x7, l 0, t 0xff) 31(c 0x64, s 0x7, l 0, t 0x31)
> Jun 24 02:15:54 mousie /kernel: Pending list: 14(c 0x60, s 0x7, l 0), 2(c 0x60, 
> s 0x7, l 0), 3(c 0x62, s 0x7, l 0), 9(c 0x60, s 0x7, l 0), 47(c 0x60, s 0x7, l 0
> ), 59(c 0x60, s 0x7, l 0), 109(c 0x60, s 0x7, l 0), 49(c 0x60, s 0x7, l 0), 16(c
>  0x62, s 0x7, l 0), 4(c 0x60, s 0x7, l 0)
> Jun 24 02:15:54 mousie /kernel: Kernel Free SCB list: 66 93 0 57 43 83 99 17 96 
> 29 10 56 35 42 65 15 117 19 31 67 115 33 51 101 21 37 39 103 40 13 50 52 94 7 18
>  91 11 102 58 81 119 24 20 98 116 44 6 85 110 114 26 118 22 113 30 80 129 36 104
>  97 92 5 38 105 12 54 107 28 46 112 108 1 100 82 48 95 27 90 32 45 55 8 25 68 41
>  111 34 69 106 53 23 86 87 88 89 70 71 72 73 74 75 76 77 78 79 60 61 62 63 64 12
> 8 127 126 125 124 123 122 121 120
> Jun 24 02:15:54 mousie /kernel: sg[0] - Addr 0x70ec000 : Length 4096
> Jun 24 02:15:54 mousie /kernel: sg[1] - Addr 0x56ed000 : Length 4096
> Jun 24 02:15:54 mousie /kernel: (da0:ahc0:0:0:0): Queuing a BDR SCB
> Jun 24 02:15:54 mousie /kernel: (da0:ahc0:0:0:0): Bus Device Reset Message Sent
> Jun 24 02:15:54 mousie /kernel: (da0:ahc0:0:0:0): no longer in timeout, status =
>  34b
> Jun 24 02:15:54 mousie /kernel: ahc0: Bus Device Reset on A:0. 10 SCBs aborted 

Ken
-- 
Kenneth Merry
ken@kdm.org

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From owner-freebsd-scsi  Fri Jun 28 12:42:26 2002
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From owner-freebsd-scsi  Fri Jun 28 14:39:55 2002
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Subject: OT: Adaptec19160 jumper question.
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Date: Fri, 28 Jun 2002 23:39:26 +0200 (MEST)
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       Hi!

I have a Adaptec 19160 PCI U160 Adaptec card and after reading all adaptec docs
and ahc(4) I don't see any mention what the two jumpers on the card are for..
I have my guesses but I thought if someone knows for sure?

    Regards
       /P

(I thought PCI cards was going to obsolete jumpers.. :-)

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From owner-freebsd-scsi  Fri Jun 28 14:53:36 2002
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On Fri, Jun 28, 2002 at 23:39:26 +0200, Peter B wrote:
> 
>        Hi!
> 
> I have a Adaptec 19160 PCI U160 Adaptec card and after reading all adaptec docs
> and ahc(4) I don't see any mention what the two jumpers on the card are for..
> I have my guesses but I thought if someone knows for sure?

They're probably for a hard drive activity LED.

Most Adaptec SCSI boards have four pins at the top of the board in the back
(opposite from the L-bracket that screws into your case) that are for
hooking up an LED.

If you download the user's guide, and look on page 16 (page 22 in the PDF
file), you'll see a mention of the LED connector:

http://www.adaptec.com/pdfs/user_guides/19160_users_reference.pdf

Most LED connectors in cases are only two pins, and since diodes only work
in one direction, you have to generally try it out to see which direction
will make it light up.

> (I thought PCI cards was going to obsolete jumpers.. :-)

Only for configuration.  :)

Ken
-- 
Kenneth Merry
ken@kdm.org

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From owner-freebsd-scsi  Fri Jun 28 15: 1: 4 2002
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From: "Kenneth D. Merry" <ken@kdm.org>
To: Peter B <pb@ludd.luth.se>
Cc: freebsd-scsi@FreeBSD.ORG
Subject: Re: OT: Adaptec19160 jumper question.
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On Fri, Jun 28, 2002 at 15:52:51 -0600, Kenneth D. Merry wrote:
> On Fri, Jun 28, 2002 at 23:39:26 +0200, Peter B wrote:
> > 
> >        Hi!
> > 
> > I have a Adaptec 19160 PCI U160 Adaptec card and after reading all adaptec docs
> > and ahc(4) I don't see any mention what the two jumpers on the card are for..
> > I have my guesses but I thought if someone knows for sure?
> 
> They're probably for a hard drive activity LED.
> 
> Most Adaptec SCSI boards have four pins at the top of the board in the back
> (opposite from the L-bracket that screws into your case) that are for
> hooking up an LED.
> 
> If you download the user's guide, and look on page 16 (page 22 in the PDF
> file), you'll see a mention of the LED connector:
> 
> http://www.adaptec.com/pdfs/user_guides/19160_users_reference.pdf
> 
> Most LED connectors in cases are only two pins, and since diodes only work
> in one direction, you have to generally try it out to see which direction
> will make it light up.

Well, I just found one, and there are two jumper pairs on the board in
addition to the LED pins.

They're labled "SE-TE", and "LVD-TE".  I'm pretty sure they're for manually
enabling termination on the single ended and LVD portions of the bus,
respectively.

Generally using automatic termination should work, or failing that, you can
tweak the termination in the BIOS.  i.e. you shouldn't need to use those
jumpers in most cases.

Ken
-- 
Kenneth Merry
ken@kdm.org

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From owner-freebsd-scsi  Fri Jun 28 17:12:17 2002
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Subject: Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T) tool?
To: freebsd-scsi@freebsd.org
Date: Sat, 29 Jun 2002 02:12:12 +0200 (MEST)
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On newer scsi drives there is a new technology called S.M.A.R.T. My question
is simply. Is there a tool already to inquire those data and interpret them to
a human readable form?
Or is it the deepdive into scsi specs that is the tune? :)

          /P

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From owner-freebsd-scsi  Fri Jun 28 18:48:16 2002
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Subject: S.M.A.R.T pII
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I discovered 'smartsuite-2.1' that seems to do the job althought for linux.
Seems there is no port. Anyone interested in trying that? ;)
        /P

(the src can be found at freshmeat or sourceforge forgot which)


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From owner-freebsd-scsi  Fri Jun 28 23:13:36 2002
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> 
> I discovered 'smartsuite-2.1' that seems to do the job 
> althought for linux.
> Seems there is no port. Anyone interested in trying that? ;)
>         /P
> 
> (the src can be found at freshmeat or sourceforge forgot which)
> 

I'm not aware of a port for this, or any other SMART tools for
FreeBSD.  Porting wouldn't be too hard; this program probably
makes use of the Linux sg driver, which is just a CDB passthrough
mechanism.  The pass driver is FreeBSD will do the same thing,
so it becomes an exercise in converting sg semantics to pass.
The cam manpages are a good start for information, and an
examination of the camcontrol source will help also.

Scott

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