Date: Fri, 15 Aug 1997 15:20:50 +0400 (MSD) From: "Sergey S. Kosyakov" <ks@itp.ac.ru> To: freebsd-hardware@freebsd.org Subject: Barracuda speed anomaly Message-ID: <XFMail.970815155130.ks@itp.ac.ru>
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Hi!
I found very strange Seagate 4Gb & 9Gb disks speed behavio when
tested with iozone and bonnie (FreeBSD-2.2.2) - 9Gb disk two times slower on
writing in compare with 4Gb disk.
Specification:
AMD K6/233 box with Adaptec AIC7880 Ultra Wide SCSI
ST-34371N Ultra-SCSI (Barracuda 4LP) 4.35Gb,
external transfer rate 20 MB/sec Sync,
internal transfer rate 80 - 122 Mbit/sec
ST-19171N Ultra-SCSI (Barracuda 9) 9.1 Gb,
external transfer rate 20 MB/sec Sync,
internal transfer rate 80 - 124 Mbit/sec
The 9GB disk was divided on two equal volume partitions.
iozone auto
bonnie
Results (appr.):
writing reading
Barracuda 4LP 9 MB/sec 40 MB/sec(iozone) - 10 MB/sec(bonnie)
Barracuda 9 4.5 MB/sec(!) 40 MB/sec - 10 MB/sec
Is it FreeBSD (SCSI driver, file system, etc), Adaptec or Seagate problem ?
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Sergey Kosyakov
Landau Institute for Theoretical Physics
E-Mail: Sergey S. Kosyakov <ks@itp.ac.ru>
Date: 15-Aug-97
Time: 15:20:51
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