LSI2008 and SAS3 backplane

[Steven Hartland]

Where you're drives supplied by Dell?

If so you may find that they have custom firmware which lowers their max 
transfer speed, we've seen that before.

Also your firmware looks very old firmware, 07.15.08.00, we're running 
20.00.04.00 which is still old, so you might want try updating.

     Regards
     Steve

On 06/11/2017 22:37, Andrew Vylegzhanin 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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