LSI2008 and SAS3 backplane

[Scott Long]

Hi,

If you’re using FreeBSD 11 or later, try running the following:

mpsutil show devices

That will show what speed the drives are actually negotiated to.  This might shed some
light on the problem.

Scott

> On Nov 6, 2017, at 3:37 PM, Andrew Vylegzhanin <avv314 at gmail.com> wrote:
> 
> Hi!
> 
> I have a problem with low transfer speed (150MB/sec instead of 600Mb/sec)
> on SAS2 controller to SAS3 drive via SAS3 backplane.
> 
> Hardware config is follows:
> 
> Dell R720 box with Dell SAS HBA 6Gbps connected with Supermicro 45-bay JBOD
> with two SAS-3 expanders (LSI SAS3x40 and LSI SAS3x36). All drives (20 pcs)
> are SEAGATE ST6000NM0095 E002.
> 
> So, partial dmesg out:
> ...
> mps1: <Avago Technologies (LSI) SAS2008> port 0x9c00-0x9cff mem
> 0xd0ff0000-0xd0ffffff,0xd0f80000-0xd0fbffff irq 66 at device 0.0
> numa-domain 1 on pci16
> mps1: Firmware: 07.15.08.00, Driver: 21.02.00.00-fbsd
> mps1: IOCCapabilities:
> 185c<ScsiTaskFull,DiagTrace,SnapBuf,EEDP,TransRetry,IR>
> ....
> ses1 at mps1 bus 0 scbus8 target 81 lun 0
> ses1: <LSI SAS3x40 0601> Fixed Enclosure Services SPC-3 SCSI device
> ses1: 150.000MB/s transfers
> ses1: Command Queueing enabled
> ses1: SCSI-3 ENC Device
> ses2 at mps1 bus 0 scbus8 target 82 lun 0
> ses2: <LSI SAS3x36 0601> Fixed Enclosure Services SPC-3 SCSI device
> ses2: 150.000MB/s transfers
> ses2: Command Queueing enabled
> ses2: SCSI-3 ENC Device
> ses1: da0: Element descriptor: 'Slot00'
> ....
> da0 at mps1 bus 0 scbus8 target 61 lun 0
> da3 at mps1 bus 0 scbus8 target 64 lun 0
> ...
> da0: <SEAGATE ST6000NM0095 E002> Fixed Direct Access SPC-4 SCSI device
> da0: Serial Number ZAD119P20000C730KZK3
> da0: 150.000MB/s transfers
> da0: Command Queueing enabled
> da0: 5723166MB (11721045168 512 byte sectors)
> 
> Some additional info.
> There is two identical system with same problem.
> System is under load now, and there is no erros, timeouts on disk i/o, so
> it seems to be not cable/hardware problem.
> I've tried other vendor SATA3 drive, got same 150MB/s.
> This server works on full speed (600MB/s transfers) with SAS2 JBOD (Dell
> MD1220)  w/o problems.
> 
> Any ideas?
> 
> --
> Andrew
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