Re: SAS drives seem slow
Josh Paetzel wrote: I have a 3ware 9690SA SAS RAID controller in a PCI-e 8x slot with Fujitsu MBA series 15k SAS drives attached, and the array is coming up as: da0 at twa0 bus 0 target 0 lun 0 da0: AMCC 9690SA-4I DISK 4.06 Fixed Direct Access SCSI-5 device da0: 100.000MB/s transfers da0: 138272MB (283181056 512 byte sectors: 255H 63S/T 17627C) If you don't get any answer here, try the freebsd-scsi@ mailing list. signature.asc Description: OpenPGP digital signature
Re: SAS drives seem slow
On Feb 26, 2009, at 12:28 AM, Wojciech Puchar wrote: FreeBSD services.tcbug.org 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Mon Feb 16 21:07:14 UTC 2009 root@:/usr/obj/usr/src/sys/SERVICES amd64 But 6.x and 7.x give similar results. The disks themselves are capable of sequential read/write in the 180 Meg/sec range, so I'm trying to understand why I'm being told they are 100 Meg/sec, and why that seems to be their real world performance cap. probably you use RAID5 Hrmm, I should have included drive configuration. r...@services /home/jpaetzel -tw_cli /c0 show Unit UnitType Status %RCmpl %V/I/M Stripe Size(GB) Cache AVrfy -- u0RAID-1OK - - - 135.031 ON ON u1RAID-1OK - - - 298.013 ON ON VPort Status Unit Size Type Phy Encl-SlotModel -- p0OK u0 136.98 GB SAS 0 -FUJITSU MBA3147RC p1OK u0 136.98 GB SAS 1 -FUJITSU MBA3147RC p2OK u1 298.09 GB SATA 2 -WDC WD3200AAKS-00SB p3OK u1 298.09 GB SATA 3 -WDC WD3200AAKS-00SB But I get similar results when I connect just a single SAS drive and export it as a raw device. It's also worth noting that the SATA drive array is reported as 100MB/sec transfers, even though the drives aren't capable of anything close to that, unless they are reading from cache, in which case SATA2 is capable of more like 300MB/sec...but then so is SAS... Thanks, Josh Paetzel ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
SAS drives seem slow
I have a 3ware 9690SA SAS RAID controller in a PCI-e 8x slot with Fujitsu MBA series 15k SAS drives attached, and the array is coming up as: da0 at twa0 bus 0 target 0 lun 0 da0: AMCC 9690SA-4I DISK 4.06 Fixed Direct Access SCSI-5 device da0: 100.000MB/s transfers da0: 138272MB (283181056 512 byte sectors: 255H 63S/T 17627C) The controller is probed as: twa0: 3ware 9000 series Storage Controller port 0x2000-0x20ff mem 0xe000-0xe1ff,0xe410-0xe4100fff irq 16 at device 0.0 on pci2 twa0: [ITHREAD] twa0: INFO: (0x15: 0x1300): Controller details:: Model 9690SA-4I, 128 ports, Firmware FH9X 4.06.00.004, BIOS BE9X 4.05.00.015 FreeBSD services.tcbug.org 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Mon Feb 16 21:07:14 UTC 2009 root@:/usr/obj/usr/src/sys/SERVICES amd64 But 6.x and 7.x give similar results. The disks themselves are capable of sequential read/write in the 180 Meg/sec range, so I'm trying to understand why I'm being told they are 100 Meg/sec, and why that seems to be their real world performance cap. # dd if=/dev/zero of=stuff bs=8m count=100 100+0 records in 100+0 records out 838860800 bytes transferred in 8.711125 secs (96297644 bytes/sec) Thanks, Josh Paetzel ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: SAS drives seem slow
FreeBSD services.tcbug.org 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Mon Feb 16 21:07:14 UTC 2009 root@:/usr/obj/usr/src/sys/SERVICES amd64 But 6.x and 7.x give similar results. The disks themselves are capable of sequential read/write in the 180 Meg/sec range, so I'm trying to understand why I'm being told they are 100 Meg/sec, and why that seems to be their real world performance cap. probably you use RAID5 # dd if=/dev/zero of=stuff bs=8m count=100 100+0 records in 100+0 records out 838860800 bytes transferred in 8.711125 secs (96297644 bytes/sec) Thanks, Josh Paetzel ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
