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Why isn't the speed of raid-0 twice of the non-raid devices? I wonder the rate of data should be twice the non-raid, if data transfering from or to on raid ...
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  1. #1
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    Promise Hardware Raid Notworking efficiently


    Why isn't the speed of raid-0 twice of the non-raid devices?
    I wonder the rate of data should be twice the non-raid, if data transfering from or to on raid device but it is not happening. Even raid device seems to be slower than non-raid.

    I got four ultra ATA 100 seagate drives 120 GB each.
    hda, hdb the non-raid regular HDD (see !!!kernel log2)
    sda is a raid-0 device comprise of to ultra ATA 100 on promise fast track controller(see !!!kernel log3)

    Here is a math of transfering 1 GB file in different route

    1- hda to hdb 50 secs (20.5 MB/s)
    2- hda to hda 81 secs (13 MB/s)
    3- sda to hda 50 secs (20.5 MB/s)
    4- sda to sda 81 secs (13 MB/s)
    5- hda to sda 77 secs (13 MB/s)
    *These test has been taken so many times and the result are very close.

    Following are more details
    I am using the RH8 on Intel S845WDE-1 having Promise 20267 on board controller and 512 DDR266 RAM. The bios is configured with array of 2 disk on raid 0.

    I had intall RH8 as per given instruction in readme on promise driver that is booting linux with
    Boot: linux ide0=ox... expert (see !!!kernel log1)
    and install the driver downloaded from the intel downloads page.

    I had formated the raid device by using the mke2fs command
    # mke2fs -j -R stride=16 /dev/sda
    The device is activated to save anything.

    The both Raid harddrives (/dev/sda) are conneted with different channel as Master Drive

    I had check HDD, when I used them as regular drives its fine.

    No Hardware fault any more!

    I dont have option to switch on the Linux software raid. I must use the Hardware/Firmware Raid on my board.

    Here are details:

    ################### Kernel Setup Log ################
    Linux version 2.4.18-14 (bhcompile@stripples.devel.redhat.com) (gcc version 3.2 20020903 (Red Hat Linux 8.0 3.2-7)) #1 Wed Sep 4 13:35:50 EDT 2002
    BIOS-provided physical RAM map:
    ...
    !!! Kernel log1
    Kernel command line: ro root=LABEL=/ ide0=0x1f0,0x3f6 ide1=0x170,0x376 ide2=0 ide3=0 ide4=0 ide5=0 ide6=0 ide7=0 ide8=0 ide9=0
    ide_setup: ide0=0x1f0,0x3f6
    ide_setup: ide1=0x170,0x376
    ide_setup: ide2=0
    ide_setup: ide3=0
    ide_setup: ide4=0
    ide_setup: ide5=0
    ide_setup: ide6=0
    ide_setup: ide7=0
    ide_setup: ide8=0
    ide_setup: ide9=0
    ...
    ...
    Real Time Clock Driver v1.10e
    oprofile: can't get RTC I/O Ports
    block: 992 slots per queue, batch=248
    Uniform Multi-Platform E-IDE driver Revision: 6.31
    ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
    PIIX4: IDE controller on PCI bus 00 dev f9
    PIIX4: chipset revision 5
    PIIX4: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hdaMA, hdbMA
    PDC20267: IDE controller on PCI bus 02 dev 70
    PCI: Found IRQ 9 for device 02:0e.0
    PDC20267: chipset revision 2
    PDC20267: not 100% native mode: will probe irqs later
    PDC20267: (U)DMA Burst Bit ENABLED Primary MASTER Mode Secondary MASTER Mode.
    PDC20267: too many IDE interfaces, no room in table
    PDC20267: too many IDE interfaces, no room in table
    PDC20267: neither IDE port enabled (BIOS)

    !!!kernel log2
    hda: ST3120022A, ATA DISK drive
    hdb: ST3120022A, ATA DISK drive
    ide2: ports already in use, skipping probe
    ide3: ports already in use, skipping probe
    ide4: ports already in use, skipping probe
    ide5: ports already in use, skipping probe
    ide6: ports already in use, skipping probe
    ide7: ports already in use, skipping probe
    ide8: ports already in use, skipping probe
    ide9: ports already in use, skipping probe
    ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
    blk: queue c03c0004, I/O limit 4095Mb (mask 0xffffffff)
    blk: queue c03c0004, I/O limit 4095Mb (mask 0xffffffff)
    hda: 234441648 sectors (120034 MB) w/2048KiB Cache, CHS=14593/255/63, UDMA(100)
    blk: queue c03c0140, I/O limit 4095Mb (mask 0xffffffff)
    blk: queue c03c0140, I/O limit 4095Mb (mask 0xffffffff)
    hdb: 234441648 sectors (120034 MB) w/2048KiB Cache, CHS=14593/255/63, UDMA(100)
    ide-floppy driver 0.99.newide
    Partition check:
    hda: hda1 hda2 hda3
    hdb: unknown partition table
    FDC 0 is a post-1991 82077
    NET4: Frame Diverter 0.46
    RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
    ide-floppy driver 0.99.newide
    md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27
    md: Autodetecting RAID arrays.
    md: autorun ...
    md: ... autorun DONE.
    NET4: Linux TCP/IP 1.0 for NET4.0
    IP Protocols: ICMP, UDP, TCP, IGMP
    IP: routing cache hash table of 4096 buckets, 32Kbytes
    TCP: Hash tables configured (established 32768 bind 65536)
    Linux IP multicast router 0.06 plus PIM-SM
    NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
    RAMDISK: Compressed image found at block 0
    Freeing initrd memory: 241k freed
    VFS: Mounted root (ext2 filesystem).
    SCSI subsystem driver Revision: 1.00
    kmod: failed to exec /sbin/modprobe -s -k scsi_hostadapter, errno = 2

    !!!kernel log3
    Promise FastTrak Series Linux Driver Version 1.2.0.15
    scsi0 : FASTTRAK
    Vendor: Promise Model: 2+0 Stripe/RAID0 Rev: 1.10
    Type: Direct-Access ANSI SCSI revision: 02
    Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
    SCSI device sda: 468882944 512-byte hdwr sectors (240068 MB)
    sda: unknown partition table
    Journalled Block Device driver loaded
    kjournald starting. Commit interval 5 seconds
    EXT3-fs: mounted filesystem with ordered data mode.
    Freeing unused kernel memory: 212k freed
    usb.c: registered new driver usbdevfs
    usb.c: registered new driver hub
    usb-uhci.c: $Revision: 1.275 $ time 13:44:31 Sep 4 2002
    usb-uhci.c: High bandwidth mode enabled
    ...
    ################### Other Maths ###################
    ----------------------------------------------------------------------------------
    # cat /proc/scsi/scsi
    Attached devices:
    Host: scsi0 Channel: 00 Id: 00 Lun: 00
    Vendor: Promise Model: 2+0 Stripe/RAID0 Rev: 1.10
    Type: Direct-Access ANSI SCSI revision: 02
    ----------------------------------------------------------------------------------
    # cat /proc/pci
    ...
    Bus 2, device 14, function 0:
    RAID bus controller: Promise Technology, Inc. 20267 (rev 2).
    IRQ 9.
    Master Capable. Latency=32.
    I/O at 0xdff0 [0xdff7].
    I/O at 0xdfe4 [0xdfe7].
    I/O at 0xdfa8 [0xdfaf].
    I/O at 0xdfe0 [0xdfe3].
    I/O at 0xdf00 [0xdf3f].
    Non-prefetchable 32 bit memory at 0xfeaa0000 [0xfeabffff].
    ...
    ----------------------------------------------------------------------------------
    # cat /proc/ide/pdc202xx

    PDC20267 Chipset.
    ------------------------------- General Status ---------------------------------
    Burst Mode : enabled
    Host Mode : Normal
    Bus Clocking : 66 External
    IO pad select : 10 mA
    Status Polling Period : 0
    Interrupt Check Status Polling Delay : 0
    --------------- Primary Channel ---------------- Secondary Channel -------------
    enabled enabled
    66 Clocking disabled disabled
    Mode MASTER Mode MASTER
    FIFO Empty FIFO Empty
    --------------- drive0 --------- drive1 -------- drive0 ---------- drive1 ------
    DMA enabled: no no no no
    DMA Mode: UDMA 4 NOTSET UDMA 4 NOTSET
    PIO Mode: PIO 4 NOTSET PIO 4 NOTSET

    ----------------------------------------------------------------------------------
    # cat /proc/partitions
    major minor #blocks name rio rmerge rsect ruse wio wmerge wsect wuse running use aveq

    8 0 234441472 sda 102931 2266114 18952320 1941126 169412 4789483 39672208 2521385 0 1679126 4815910
    3 0 117220824 hda 158268 1985197 17147260 4264425 47901 566852 4919776 5416146 -3 3892083 6373799
    3 1 4192933 hda1 13028 18793 254546 83560 12124 72068 675120 3027902 0 263269 3113320
    3 2 111973050 hda2 145229 1966373 16892594 4180806 35777 494784 4244656 2388244 0 590626 6584490
    3 3 1052257 hda3 9 25 104 41 0 0 0 0 0 41 41
    3 64 117220824 hdb 102094 1473798 12607106 2129949 85597 1230469 10528808 3382836 -3 3901315 2224366

    ------------------------------------------------------------------------------------------
    # hdparm -Tt /dev/hda

    /dev/hda:
    Timing buffer-cache reads: 128 MB in 0.36 seconds =358.14 MB/sec
    Timing buffered disk reads: 64 MB in 1.40 seconds = 45.70 MB/sec
    ------------------------------------------------------------------------------------------
    # hdparm -Tt /dev/hdb

    /dev/hdb:
    Timing buffer-cache reads: 128 MB in 0.34 seconds =374.52 MB/sec
    Timing buffered disk reads: 64 MB in 1.21 seconds = 52.68 MB/sec
    ------------------------------------------------------------------------------------------
    # hdparm -Tt /dev/sda

    /dev/sda:
    Timing buffer-cache reads: 128 MB in 0.35 seconds =368.20 MB/sec
    Timing buffered disk reads: 64 MB in 0.96 seconds = 66.47 MB/sec


    Thats all

    I would appreciate any help.
    Sorry for the long message

  2. #2
    Linux Guru kkubasik's Avatar
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    im befuzzled, i would guess its something to do with drivers and linux support of raids, but i want to set up a raid array on my linux box but havent yet, im look forword to anyone who can explain this.

  3. #3
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    Qub! you woud be right but I had tried every thing, updated driverss, kernels. All in vain. I think I should quit Linux and return to Microsoft windows (a easy option for me, no such upgradation).
    Let see I had one more hope to survice with the sevage linux.

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