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SubjectSlow write performance with mpt2sas
I've noticed that my SAS9212-4i4e is having write issues.  I have a raid5 of
4 2tb seagate green drives and a raid5 of 3 300gb seagate 15k sas drives.
Write performance on the green drives is fairly poor. The riad4 of 4 disks
has a write performance of about 6-10mb/sec. My onboard sas controller
(1068e chip IT mode) does not have this issue (I'm using raid6 on 8 of the
same model green drives).

Write performance on the 15k drives in raid 5 was 140mb/sec (4gb volume).

Here's some information from lsi's sas2flash util:
Controller : SAS2008(B1)
PCI Address : 00:03:00:00
SAS Address : 500605b-0-01d0-ab00
NVDATA Version (Default) : 0a.03.00.02
NVDATA Version (Persistent) : 0a.03.00.02
Firmware Product ID : 0x2713
Firmware Version : 11.00.00.00
NVDATA Vendor : LSI
NVDATA Product ID : SAS9212-4i4e
BIOS Version : 07.21.00.00
UEFI BSD Version : N/A
FCODE Version : N/A
Board Name : SAS9212-4i4e
Board Assembly : H3-25134-00A
Board Tracer Number : P131430410

I'm using stock kernel 2.6.39 compiled for 64-bit. This sas controller has
IR firmware.

Relevent information from dmesg:
[ 1.585459] mpt2sas version 08.100.00.00 loaded
[ 1.585564] scsi0 : Fusion MPT SAS Host
[ 1.585772] mpt2sas 0000:03:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[ 1.585846] mpt2sas 0000:03:00.0: setting latency timer to 64
[ 1.585849] mpt2sas0: 64 BIT PCI BUS DMA ADDRESSING SUPPORTED, total mem (12301640 kB)
[ 1.585966] mpt2sas0: IO-APIC enabled: IRQ 16
[ 1.586027] mpt2sas0: iomem(0x00000000fac3c000), mapped(0xffffc90000020000), size(16384)
[ 1.586110] mpt2sas0: ioport(0x000000000000a000), size(256)
[ 1.872511] mpt2sas0: sending diag reset !!
[ 2.355485] Refined TSC clocksource calibration: 2133.333 MHz.
[ 2.355561] Switching to clocksource tsc
[ 2.974166] mpt2sas0: diag reset: SUCCESS
[ 3.121510] mpt2sas0: Allocated physical memory: size(3999 kB)
[ 3.121574] mpt2sas0: Current Controller Queue Depth(1753), Max Controller Queue Depth(2000)
[ 3.121659] mpt2sas0: Scatter Gather Elements per IO(128)
[ 3.353750] mpt2sas0: LSISAS2008: FWVersion(11.00.00.00), ChipRevision(0x02), BiosVersion(07.21.00.00)
[ 3.353848] mpt2sas0: Protocol=(Initiator), Capabilities=(Raid,TLR,EEDP,Snapshot Buffer,Diag Trace Buffer,Task Set Full,NCQ)
[ 3.354367] mpt2sas0: sending port enable !!
[ 4.888265] mpt2sas0: host_add: handle(0x0001), sas_addr(0x500605b001d0ab00), phys(8)
[ 10.998203] mpt2sas0: port enable: SUCCESS

Any suggestions?

PS. I am on the list. I do prefer courtesy CC.

--
Microsoft has beaten Volkswagen's world record. Volkswagen only created 22
million bugs.


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