Date: Tue, 7 Nov 2017 01:37:43 +0300 From: Andrew Vylegzhanin <avv314@gmail.com> To: freebsd-scsi@freebsd.org Subject: LSI2008 and SAS3 backplane Message-ID: <CA%2BBi_Yj7LNVB86-o_PmWMxeiz8DZ6n-8jyFpngOAmKJXCxL4nQ@mail.gmail.com>
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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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