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Date:      Sun, 20 Jun 2010 01:36:20 +0100
From:      "Graeme Dargie" <arab@tangerine-army.co.uk>
To:        <freebsd-questions@freebsd.org>
Subject:   RE: Need help with SATA disk timing out in 8.1 Beta
Message-ID:  <01FB8F39BAD0BD49A6D0DA8F7897392904F7A4@Mercury.galaxy.lan.lcl>
In-Reply-To: <4C1AFFF5.1070000@nrdx.com>
References:  <4C1AFFF5.1070000@nrdx.com>

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-----Original Message-----
From: Jerry Bell [mailto:jerry@nrdx.com]=20
Sent: 18 June 2010 06:11
To: freebsd-questions@freebsd.org
Subject: Need help with SATA disk timing out in 8.1 Beta

I am having all sorts of problems with drives in a new server.
I have a 450G sata drive that hold my root partition, works great, no=20
issues.
I have a second, 1TB drive that has been all sorts of trouble.  When=20
writing to this disk, I occasionally see errors like this:

Jun 17 07:40:36 www3 kernel: ad8: WARNING - WRITE_DMA48 UDMA ICRC error=20
(retrying request) LBA=3D1564898207
Jun 17 07:40:36 www3 kernel: ad8: FAILURE - WRITE_DMA48=20
status=3D51<READY,DSC,ERROR> error=3D10<NID_NOT_FOUND> LBA=3D1564898207
Jun 17 07:57:12 www3 kernel: ad8: WARNING - WRITE_DMA48 UDMA ICRC error=20
(retrying request) LBA=3D1565052351
Jun 17 07:57:12 www3 kernel: ad8: FAILURE - WRITE_DMA48=20
status=3D51<READY,DSC,ERROR> error=3D10<NID_NOT_FOUND> LBA=3D1565052351
Jun 17 09:45:12 www3 kernel: ad8: WARNING - WRITE_DMA48 UDMA ICRC error=20
(retrying request) LBA=3D1565983775
Jun 17 09:45:12 www3 kernel: ad8: FAILURE - WRITE_DMA48=20
status=3D51<READY,DSC,ERROR> error=3D10<NID_NOT_FOUND> LBA=3D1565983775
Jun 17 09:50:24 www3 kernel: ad8: WARNING - WRITE_DMA48 UDMA ICRC error=20
(retrying request) LBA=3D1566082719
Jun 17 09:50:24 www3 kernel: ad8: FAILURE - WRITE_DMA48=20
status=3D51<READY,DSC,ERROR> error=3D10<NID_NOT_FOUND> LBA=3D1566082719
Jun 17 10:01:25 www3 kernel: ad8: WARNING - WRITE_DMA48 UDMA ICRC error=20
(retrying request) LBA=3D1566358623
Jun 17 10:01:25 www3 kernel: ad8: FAILURE - WRITE_DMA48=20
status=3D51<READY,DSC,ERROR> error=3D10<NID_NOT_FOUND> LBA=3D1566358623
Jun 17 10:02:59 www3 kernel: ad8: WARNING - WRITE_DMA48 UDMA ICRC error=20
(retrying request) LBA=3D1566387807
Jun 17 10:02:59 www3 kernel: ad8: FAILURE - WRITE_DMA48=20
status=3D51<READY,DSC,ERROR> error=3D10<NID_NOT_FOUND> LBA=3D1566387807
Jun 17 10:18:59 www3 kernel: ad8: WARNING - WRITE_DMA UDMA ICRC error=20
(retrying request) LBA=3D43231
Jun 17 10:18:59 www3 kernel: ad8: WARNING - WRITE_DMA UDMA ICRC error=20
(retrying request) LBA=3D57567
Jun 17 10:18:59 www3 kernel: ad8: WARNING - WRITE_DMA UDMA ICRC error=20
(retrying request) LBA=3D773471
Jun 17 10:18:59 www3 kernel: ad8: WARNING - WRITE_DMA UDMA ICRC error=20
(retrying request) LBA=3D786271
Jun 17 10:18:59 www3 kernel: ad8: WARNING - WRITE_DMA UDMA ICRC error=20
(retrying request) LBA=3D810079
Jun 17 10:19:00 www3 kernel: ad8: WARNING - WRITE_DMA UDMA ICRC error=20
(retrying request) LBA=3D76767
Jun 17 10:19:00 www3 kernel: ad8: WARNING - WRITE_DMA UDMA ICRC error=20
(retrying request) LBA=3D784479

Last week, I asked the datacenter to provide me with a new 1TB drive,=20
and they did.  It formatted fine, no errors.  I copied files to it, ran=20
bonnie, etc, and no signs of any DMA issues.
Until this morning when I started having the errors again.

If I run a tool like bonnie, I am very easily reproduce the errors. =20
After some research, I find that these errors are often indicative of=20
SATA cable problems.
The datacenter replaced the cable, and the problem continues.
The datacenter moved the sata cable to a new SATA port, and the problem=20
continues
The datacenter adds a BRAND NEW 1TB drive (now the system has 3 drive),=20
and I am unable to format the drive because of these errors:
ad10: WARNING - WRITE_DMA UDMA ICRC error (retrying request)
LBA=3D168172351
ad10: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)
LBA=3D602334847
ad10: FAILURE - WRITE_DMA48 status=3D51<READY,DSC,ERROR>=20
error=3D10<NID_NOT_FOUND> LBA=3D602334847
ad10: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)
LBA=3D427014463
ad10: FAILURE - WRITE_DMA48 status=3D51<READY,DSC,ERROR>=20
error=3D10<NID_NOT_FOUND> LBA=3D427014463
ad10: WARNING - WRITE_DMA UDMA ICRC error (retrying request)
LBA=3D15425407
ad10: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)
LBA=3D471408895
ad10: FAILURE - WRITE_DMA48 status=3D51<READY,DSC,ERROR>=20
error=3D10<NID_NOT_FOUND> LBA=3D471408895
ad10: WARNING - WRITE_DMA UDMA ICRC error (retrying request)
LBA=3D91422655
ad10: WARNING - WRITE_DMA UDMA ICRC error (retrying request)
LBA=3D203161183
ad10: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)=20
LBA=3D1211817727
ad10: FAILURE - WRITE_DMA48 status=3D51<READY,DSC,ERROR>=20
error=3D10<NID_NOT_FOUND> LBA=3D1211817727
ad10: WARNING - WRITE_DMA UDMA ICRC error (retrying request)
LBA=3D37998847
ad10: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)
LBA=3D309632575
ad10: FAILURE - WRITE_DMA48 status=3D51<READY,DSC,ERROR>=20
error=3D10<NID_NOT_FOUND> LBA=3D309632575
ad10: TIMEOUT - WRITE_DMA retrying (1 retry left) LBA=3D24831007
ad10: WARNING - WRITE_DMA UDMA ICRC error (retrying request)
LBA=3D59067391
ad10: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)
LBA=3D497744575
ad10: FAILURE - WRITE_DMA48 status=3D51<READY,DSC,ERROR>=20
error=3D10<NID_NOT_FOUND> LBA=3D497744575
ad10: FAILURE - WRITE_MUL status=3D51<READY,DSC,ERROR>=20
error=3D84<ICRC,ABORTED> LBA=3D1128895
ad10: WARNING - WRITE_DMA UDMA ICRC error (retrying request)
LBA=3D13920511
ad10: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)
LBA=3D547029919
ad10: FAILURE - WRITE_DMA48 status=3D51<READY,DSC,ERROR>=20
error=3D10<NID_NOT_FOUND> LBA=3D547029919

So, the problem has occurred on 3 different drives.
SATA ports and cables do not appear to impact the problem.
The primary 450GB drive does not have any problems.
I have used atacontrol to lower the speed all the way down to UDMA 33,=20
with the same result.

I am at the end of my ability to troubleshoot this.  Could this be a=20
problem with FreeBSD 8.1 beta and not the drives after all?
I have seen a reference to a patch for previous versions that increase=20
the DMA timeout time to 10 or 15 seconds, which fixes problems, but I am

not certain that would fix my particular issue.


Here is the dmesg output:
Copyright (c) 1992-2010 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
         The Regents of the University of California. All rights
reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 8.1-PRERELEASE #1: Thu Jun 10 23:52:29 UTC 2010
     jerry@www3.stelesys.com:/usr/obj/usr/src/sys/JERRY amd64
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(R) CPU           X3450  @ 2.67GHz (2674.98-MHz=20
K8-class CPU)
   Origin =3D "GenuineIntel"  Id =3D 0x106e5  Family =3D 6  Model =3D 1e =
=20
Stepping =3D 5
  =20
Features=3D0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PG=
E
,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  =20
Features2=3D0x98e3fd<SSE3,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xT=
P
R,PDCM,SSE4.1,SSE4.2,POPCNT>
   AMD Features=3D0x28100800<SYSCALL,NX,RDTSCP,LM>
   AMD Features2=3D0x1<LAHF>
   TSC: P-state invariant
real memory  =3D 6442450944 (6144 MB)
avail memory =3D 6138769408 (5854 MB)
ACPI APIC Table: <020910 APIC2308>
FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs
FreeBSD/SMP: 1 package(s) x 4 core(s) x 2 SMT threads
  cpu0 (BSP): APIC ID:  0
  cpu1 (AP): APIC ID:  1
  cpu2 (AP): APIC ID:  2
  cpu3 (AP): APIC ID:  3
  cpu4 (AP): APIC ID:  4
  cpu5 (AP): APIC ID:  5
  cpu6 (AP): APIC ID:  6
  cpu7 (AP): APIC ID:  7
ioapic0: Changing APIC ID to 8
ioapic0 <Version 2.0> irqs 0-23 on motherboard
kbd1 at kbdmux0
acpi0: <020910 RSDT2308> on motherboard
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
acpi0: reservation of 0, a0000 (3) failed
acpi0: reservation of 100000, bdf00000 (3) failed
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
cpu0: <ACPI CPU> on acpi0
ACPI Warning: Incorrect checksum in table [OEMB] - 0x86, should be 0x85=20
(20100331/tbutils-354)
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
cpu4: <ACPI CPU> on acpi0
cpu5: <ACPI CPU> on acpi0
cpu6: <ACPI CPU> on acpi0
cpu7: <ACPI CPU> on acpi0
acpi_hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on=20
acpi0
Timecounter "HPET" frequency 14318180 Hz quality 900
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <ACPI PCI-PCI bridge> irq 16 at device 3.0 on pci0
pci1: <ACPI PCI bus> on pcib1
vgapci0: <VGA-compatible display> mem=20
0xfa000000-0xfaffffff,0xd0000000-0xdfffffff,0xf9000000-0xf9ffffff irq 16

at device 0.0 on pci1
pci0: <base peripheral> at device 8.0 (no driver attached)
pci0: <base peripheral> at device 8.1 (no driver attached)
pci0: <base peripheral> at device 8.2 (no driver attached)
pci0: <base peripheral> at device 8.3 (no driver attached)
pci0: <base peripheral> at device 16.0 (no driver attached)
pci0: <base peripheral> at device 16.1 (no driver attached)
pci0: <simple comms> at device 22.0 (no driver attached)
ehci0: <Intel PCH USB 2.0 controller USB-B> mem 0xf8ffe000-0xf8ffe3ff=20
irq 16 at device 26.0 on pci0
ehci0: [ITHREAD]
usbus0: EHCI version 1.0
usbus0: <Intel PCH USB 2.0 controller USB-B> on ehci0
pci0: <multimedia, HDA> at device 27.0 (no driver attached)
pcib2: <ACPI PCI-PCI bridge> irq 17 at device 28.0 on pci0
pci6: <ACPI PCI bus> on pcib2
atapci0: <JMicron JMB368 UDMA133 controller> port=20
0xec00-0xec07,0xe880-0xe883,0xe800-0xe807,0xe480-0xe483,0xe400-0xe40f=20
irq 16 at device 0.0 on pci6
atapci0: [ITHREAD]
ata2: <ATA channel 0> on atapci0
ata2: [ITHREAD]
pcib3: <ACPI PCI-PCI bridge> irq 18 at device 28.2 on pci0
pci5: <ACPI PCI bus> on pcib3
pcib4: <ACPI PCI-PCI bridge> irq 19 at device 28.3 on pci0
pci4: <ACPI PCI bus> on pcib4
pcib5: <ACPI PCI-PCI bridge> irq 17 at device 28.4 on pci0
pci3: <ACPI PCI bus> on pcib5
re0: <RealTek 8168/8111 B/C/CP/D/DP/E PCIe Gigabit Ethernet> port=20
0xd800-0xd8ff mem 0xf7fff000-0xf7ffffff,0xf7ff8000-0xf7ffbfff irq 16 at=20
device 0.0 on pci3
re0: Using 1 MSI messages
re0: Chip rev. 0x28000000
re0: MAC rev. 0x00000000
miibus0: <MII bus> on re0
rgephy0: <RTL8169S/8110S/8211B media interface> PHY 1 on miibus0
rgephy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT,=20
1000baseT-FDX, auto
re0: Ethernet address: e0:cb:4e:ed:05:a0
re0: [FILTER]
pcib6: <ACPI PCI-PCI bridge> irq 16 at device 28.5 on pci0
pci2: <ACPI PCI bus> on pcib6
ehci1: <Intel PCH USB 2.0 controller USB-A> mem 0xf8ffd000-0xf8ffd3ff=20
irq 23 at device 29.0 on pci0
ehci1: [ITHREAD]
usbus1: EHCI version 1.0
usbus1: <Intel PCH USB 2.0 controller USB-A> on ehci1
pcib7: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci7: <ACPI PCI bus> on pcib7
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci1: <Intel PCH SATA300 controller> port=20
0xbc00-0xbc07,0xb880-0xb883,0xb800-0xb807,0xb480-0xb483,0xb400-0xb40f,0x
b080-0xb08f=20
irq 21 at device 31.2 on pci0
atapci1: [ITHREAD]
ata3: <ATA channel 0> on atapci1
ata3: [ITHREAD]
ata4: <ATA channel 1> on atapci1
ata4: [ITHREAD]
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
atapci2: <Intel PCH SATA300 controller> port=20
0xcc00-0xcc07,0xc880-0xc883,0xc800-0xc807,0xc480-0xc483,0xc400-0xc40f,0x
c080-0xc08f=20
irq 21 at device 31.5 on pci0
atapci2: [ITHREAD]
ata5: <ATA channel 0> on atapci2
ata5: [ITHREAD]
ata6: <ATA channel 1> on atapci2
ata6: [ITHREAD]
acpi_button0: <Power Button> on acpi0
atrtc0: <AT realtime clock> port 0x70-0x71 irq 8 on acpi0
uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
uart0: [FILTER]
orm0: <ISA Option ROM> at iomem 0xce800-0xcf7ff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=3D0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on
isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
atkbd0: [ITHREAD]
ppc0: cannot reserve I/O port range
est0: <Enhanced SpeedStep Frequency Control> on cpu0
p4tcc0: <CPU Frequency Thermal Control> on cpu0
est1: <Enhanced SpeedStep Frequency Control> on cpu1
p4tcc1: <CPU Frequency Thermal Control> on cpu1
est2: <Enhanced SpeedStep Frequency Control> on cpu2
p4tcc2: <CPU Frequency Thermal Control> on cpu2
est3: <Enhanced SpeedStep Frequency Control> on cpu3
p4tcc3: <CPU Frequency Thermal Control> on cpu3
est4: <Enhanced SpeedStep Frequency Control> on cpu4
p4tcc4: <CPU Frequency Thermal Control> on cpu4
est5: <Enhanced SpeedStep Frequency Control> on cpu5
p4tcc5: <CPU Frequency Thermal Control> on cpu5
est6: <Enhanced SpeedStep Frequency Control> on cpu6
p4tcc6: <CPU Frequency Thermal Control> on cpu6
est7: <Enhanced SpeedStep Frequency Control> on cpu7
p4tcc7: <CPU Frequency Thermal Control> on cpu7
Timecounters tick every 1.000 msec
IP Filter: v4.1.28 initialized.  Default =3D pass all, Logging =3D =
enabled
usbus0: 480Mbps High Speed USB v2.0
usbus1: 480Mbps High Speed USB v2.0
ad7: 476940MB <Seagate ST3500418AS CC38> at ata3-slave UDMA100 SATA
3Gb/s
ugen0.1: <Intel> at usbus0
uhub0: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus0
ugen1.1: <Intel> at usbus1
uhub1: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus1
GEOM: ad7s1: geometry does not match label (255h,63s !=3D 16h,63s).
ad9: 953869MB <WDC WD10EALS-00Z8A0 05.01D05> at ata4-slave UDMA100 SATA=20
3Gb/s
ad10: 953869MB <WDC WD10EALS-00Z8A0 05.01D05> at ata5-master UDMA100=20
SATA 3Gb/s
SMP: AP CPU #1 Launched!
SMP: AP CPU #2 Launched!
SMP: AP CPU #7 Launched!
SMP: AP CPU #3 Launched!
SMP: AP CPU #6 Launched!
SMP: AP CPU #5 Launched!
SMP: AP CPU #4 Launched!
Root mount waiting for: usbus1 usbus0
uhub0: 2 ports with 2 removable, self powered
uhub1: 2 ports with 2 removable, self powered
Root mount waiting for: usbus1 usbus0
ugen0.2: <vendor 0x8087> at usbus0
uhub2: <vendor 0x8087 product 0x0020, class 9/0, rev 2.00/0.00, addr 2>=20
on usbus0
ugen1.2: <vendor 0x8087> at usbus1
uhub3: <vendor 0x8087 product 0x0020, class 9/0, rev 2.00/0.00, addr 2>=20
on usbus1
uhub2: 6 ports with 6 removable, self powered
Root mount waiting for: usbus1
uhub3: 8 ports with 8 removable, self powered
Trying to mount root from ufs:/dev/ad7s1a
re0: link state changed to UP
ugen1.3: <Peppercon AG> at usbus1
ukbd0: <Peppercon AG Multidevice, class 0/0, rev 2.00/0.01, addr 3> on=20
usbus1
kbd2 at ukbd0
ums0: <Peppercon AG Multidevice, class 0/0, rev 2.00/0.01, addr 3> on
usbus1
ums0: 3 buttons and [Z] coordinates ID=3D0
ad10: WARNING - WRITE_DMA UDMA ICRC error (retrying request)
LBA=3D168172351
ad10: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)
LBA=3D602334847
ad10: FAILURE - WRITE_DMA48 status=3D51<READY,DSC,ERROR>=20
error=3D10<NID_NOT_FOUND> LBA=3D602334847
ad10: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)
LBA=3D427014463
ad10: FAILURE - WRITE_DMA48 status=3D51<READY,DSC,ERROR>=20
error=3D10<NID_NOT_FOUND> LBA=3D427014463
ad10: WARNING - WRITE_DMA UDMA ICRC error (retrying request)
LBA=3D15425407
ad10: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)
LBA=3D471408895
ad10: FAILURE - WRITE_DMA48 status=3D51<READY,DSC,ERROR>=20
error=3D10<NID_NOT_FOUND> LBA=3D471408895
ad10: WARNING - WRITE_DMA UDMA ICRC error (retrying request)
LBA=3D91422655
ad10: WARNING - WRITE_DMA UDMA ICRC error (retrying request)
LBA=3D203161183
ad10: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)=20
LBA=3D1211817727
ad10: FAILURE - WRITE_DMA48 status=3D51<READY,DSC,ERROR>=20
error=3D10<NID_NOT_FOUND> LBA=3D1211817727
ad10: WARNING - WRITE_DMA UDMA ICRC error (retrying request)
LBA=3D37998847
ad10: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)
LBA=3D309632575
ad10: FAILURE - WRITE_DMA48 status=3D51<READY,DSC,ERROR>=20
error=3D10<NID_NOT_FOUND> LBA=3D309632575
ad10: TIMEOUT - WRITE_DMA retrying (1 retry left) LBA=3D24831007
ad10: WARNING - WRITE_DMA UDMA ICRC error (retrying request)
LBA=3D59067391
ad10: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)
LBA=3D497744575
ad10: FAILURE - WRITE_DMA48 status=3D51<READY,DSC,ERROR>=20
error=3D10<NID_NOT_FOUND> LBA=3D497744575
ad10: FAILURE - WRITE_MUL status=3D51<READY,DSC,ERROR>=20
error=3D84<ICRC,ABORTED> LBA=3D1128895
ad10: WARNING - WRITE_DMA UDMA ICRC error (retrying request)
LBA=3D13920511
ad10: WARNING - WRITE_DMA48 UDMA ICRC error (retrying request)
LBA=3D547029919
ad10: FAILURE - WRITE_DMA48 status=3D51<READY,DSC,ERROR>=20
error=3D10<NID_NOT_FOUND> LBA=3D547029919

Please help.

Thank you,

Jerry


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I had a similar problem with FreeBSD 8.0 on one machine, granted it was
just home hardware and not server class equipment.

To cut to the chase, I replaced the cables the offending drive about 3
times and still did not cure it. I eventually purchased a 6 port sata
raid card, which appeared to have solved the problem but eventually it
too started to give time out errors, but it was the card itself and not
the drives throwing up the errors.=20

I then ran memtest on the system, which threw up some really odd
results, 1 x 1gb dimm fitted all tests passed
2 x 1gb fitted threw up 1 error I had 4 dimms so tried them in various
combinations but I always got an error on the 2 slot, despite all the
dimms passing hours of testing individually. I replaced the mainboard
and the machine has been fine with the same disks and cables, I also
transferred the sata raid card into a 1u rack and it has been fine.

So you might want to have a look in the direction of the ram or the
mainboard.

Regards
Graeme




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