Date: Wed, 27 Aug 2003 07:21:30 -0500 (EST) From: "Michael L. Squires" <mikes@siralan.org> To: dan@langille.org Cc: FreeBSD SCSI <freebsd-scsi@freebsd.org> Subject: Re: SCSI tape data loss Message-ID: <200308271221.h7RCLUsP001665@siralan.org> In-Reply-To: <200308251117.h7PBH1SA018124@siralan.org> "from Michael L. Squires at Aug 25, 2003 06:17:01 am"
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I ran "tapetest.c" under 4.8-STABLE and did not observe any difference
between the version compiled with pthreads and the version compiled
without pthreads.
Without pthreads taptest wrote and read 141,776 blocks on a DLT III (10/20GB)
tape in a DLT4000 drive; with pthreads it wrote and read 142,879 blocks.
Results using 5.1-RELEASE running on another system were similar, i.e., no
difference between the number of blocks written and read using either pthreads
or not using pthreads.
4.8-STABLE is running on a Supermicro P6DGH with dual PII/300's, onboard
Adaptec U2W controller, ADIC VLS DLT changer with DLT4000 tape drive.
5.1-RELEASE is running on a Supermicro P6DGH with dual PIII/850's, onboard
Adaptec U2W controller, single DLT4000 tape drive.
MLS
>From dmesg:
----------------------------------------------------------------------------
FreeBSD 4.8-STABLE #1: Mon Aug 4 21:05:33 EST 2003
root@newserv.siralan.org:/usr/obj/usr/src/sys/NEWSERV
Timecounter "i8254" frequency 1193182 Hz
CPU: Pentium II/Pentium II Xeon/Celeron (300.68-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0x634 Stepping = 4
Features=0x80fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,MMX>
real memory = 268304384 (262016K bytes)
config> q
avail memory = 255660032 (249668K bytes)
FreeBSD/SMP: Multiprocessor motherboard: 2 CPUs
cpu0 (BSP): apic id: 0, version: 0x00040011, at 0xfee00000
cpu1 (AP): apic id: 1, version: 0x00040011, at 0xfee00000
io0 (APIC): apic id: 2, version: 0x00170011, at 0xfec00000
ahc0: <Adaptec aic7896/97 Ultra2 SCSI adapter> port 0xe000-0xe0ff mem 0xfebfd000-0xfebfdfff irq 10 at device 14.0 on pci0
aic7896/97: Ultra2 Wide Channel A, SCSI Id=7, 32/253 SCBs
ahc1: <Adaptec aic7896/97 Ultra2 SCSI adapter> port 0xe400-0xe4ff mem 0xfebfe000-0xfebfefff irq 10 at device 14.1 on pci0
aic7896/97: Ultra2 Wide Channel B, SCSI Id=7, 32/253 SCBs
SMP: AP CPU #1 Launched!
sa0 at ahc2 bus 0 target 2 lun 0
sa0: <Quantum DLT4000 CD50> Removable Sequential Access SCSI-2 device
sa0: 10.000MB/s transfers (10.000MHz, offset 15)
----------------------------------------------------------------------------
Tapetest output:
no pthread:
Write failed. Last block writen=141776. stat=0 ERR=Unknown error: 0
End of tape
Total files=1, blocks=141776, bytes = 556318720
with pthread:
rawfill:
Write failed. Last block written=142879. stat=-1 ERR No space left on device
scan:
Bad status from read -1. ERR=Input/output error
142879 blocks of 64512 bytes in file 0
Mike Squires
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