[3918] in linux-scsi channel archive
IO rate only 10 MB/sec?
daemon@ATHENA.MIT.EDU (Clem Pryke)
Wed May 13 21:41:04 1998
To: linux-scsi@vger.rutgers.edu
cc: pryke@aupc1.uchicago.edu
Date: Wed, 13 May 1998 17:59:58 -0400
From: Clem Pryke <pryke@aupc1.uchicago.edu>
Hi all,
I have a Dell GXPro running RedHat 5. It contains two
Adaptec AHA-2940 Ultra SCSI boards. One of these is connected
to a Seagate 23 GB ST423451W disk as the only device on the
bus. When I do "/sbin/hdparm -Tt /dev/sdb1" I see:
/dev/sdb1:
Timing buffer-cache reads: 32 MB in 0.68 seconds =47.06 MB/sec
Timing buffered disk reads: 16 MB in 1.48 seconds =10.81 MB/sec
Is 10 MB/sec the most I can expect from fast/wide SCSI, or
should I get more? (I could really use more bandwidth). dmseg
excerpt follows:
Thanks for any help,
Clem Pryke
aic7xxx: <Adaptec AHA-294X Ultra SCSI host adapter> at PCI 9
aic7xxx: Warning - detected auto-termination. Please verify driver
detected settings and use manual termination if necessary.
aic7xxx: BIOS enabled, IO Port 0xe800, IO Mem 0xfcfff000, IRQ 11, Revision B
aic7xxx: Wide Channel, SCSI ID 7, 16/16 SCBs, QFull 16, QMask 0x1f
aic7xxx: <Adaptec AHA-294X Ultra SCSI host adapter> at PCI 10
aic7xxx: Warning - detected auto-termination. Please verify driver
detected settings and use manual termination if necessary.
aic7xxx: BIOS enabled, IO Port 0xe400, IO Mem 0xfcffe000, IRQ 10, Revision B
aic7xxx: Wide Channel, SCSI ID 7, 16/16 SCBs, QFull 16, QMask 0x1f
scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 4.1/3.2
scsi1 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 4.1/3.2
scsi : 2 hosts.
scsi0: Scanning channel A for devices.
Vendor: WDIGTL Model: WDE4360-1807A3 Rev: 1.80
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
scsi0: Target 5, channel A, refusing WIDE negotiation; using 8 bit transfers.
Vendor: NEC Model: CD-ROM DRIVE:464 Rev: 1.04
Type: CD-ROM ANSI SCSI revision: 02
Detected scsi CD-ROM sr0 at scsi0, channel 0, id 5, lun 0
scsi0: Target 6, channel A, refusing WIDE negotiation; using 8 bit transfers.
Vendor: ARCHIVE Model: Python 00095-001 Rev: 5.ac
Type: Sequential-Access ANSI SCSI revision: 02
Detected scsi tape st0 at scsi0, channel 0, id 6, lun 0
scsi1: Scanning channel A for devices.
Vendor: SEAGATE Model: ST423451W Rev: 0013
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sdb at scsi1, channel 0, id 1, lun 0
scsi : detected 1 SCSI tape 1 SCSI cdrom 2 SCSI disks total.
SCSI device sda: hdwr sector= 512 bytes. Sectors= 8388314 [4095 MB] [4.1 GB]
SCSI device sdb: hdwr sector= 512 bytes. Sectors= 45322644 [22130 MB] [22.1 GB]
--
**********************************************************************
Clem Pryke
University of Chicago,
Room 226, LASR, 933 East 56th Street, Chicago, Illinois 60637, USA
Tel: 773 702-7853 Fax: 773 702-6645 email: pryke@hep.uchicago.edu
anonymous ftp: aupc1.uchicago.edu pub/auger/pryke
**********************************************************************
-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@vger.rutgers.edu
