MMM
Results 1 to 25 of 36

Thread: bit error = lost file, reduce BER how?

Threaded View

  1. #30
    Xtreme Addict
    Join Date
    Jul 2006
    Posts
    1,124
    Yeah, the INFO's you can ignore they are just telling you what functions are being entered (it /IS/ only an after-dinner first pass. :P) The ERROR one basically is saying that there is no previous output to compare the file system to in the first draft it is set up (hard-coded) to write a file called md5sum.<yearmonth>01 (I must have forgotten to fix that) was going to just search the $HASHDIR for the newest output and use that. Anyway, I ran it against about 900,000 files here both unicode-16 and normal file names (multi-byte characters) so that's clean at least and it does multi-threading (which was the main thing I was going for).

    create the directory /var/log/md5sum then run it first in create mode:
    md5check.sh <directory> create
    then run it in check mode
    md5check.sh <directory> check


    I've been e-mailing Eric Gerbier (writer of afick http://afick.sourceforge.net/) to see if we can merge ideas. Mine above works well with large files (100MiB+) (was able to push 800MiB/s throughput on a 2.4Ghz quad core which fully saturated the areca 1280ML) but with small files the spawning of the md5sum is a killer. Eric uses perl which has md5/sha1 already built in (no spawning penalty) however he doesn't have any multi-threading (so limited to about 200-250MiB/sec max on a 2.4Ghz core2). He also is already using GDBM, which is what I was going to do next in mine.
    Last edited by stevecs; 12-31-2008 at 06:59 PM.

    |.Server/Storage System.............|.Gaming/Work System..............................|.Sundry...... ............|
    |.Supermico X8DTH-6f................|.Asus Z9PE-D8 WS.................................|.HP LP3065 30"LCD Monitor.|
    |.(2) Xeon X5690....................|.2xE5-2643 v2....................................|.Mino lta magicolor 7450..|
    |.(192GB) Samsung PC10600 ECC.......|.2xEVGA nVidia GTX670 4GB........................|.Nikon coolscan 9000......|
    |.800W Redundant PSU................|.(8x8GB) Kingston DDR3-1600 ECC..................|.Quantum LTO-4HH..........|
    |.NEC Slimline DVD RW DL............|.Corsair AX1200..................................|........ .................|
    |.(..6) LSI 9200-8e HBAs............|.Lite-On iHBS112.................................|.Dell D820 Laptop.........|
    |.(..8) ST9300653SS (300GB) (RAID0).|.PA120.3, Apogee, MCW N&S bridge.................|...2.33Ghz; 8GB Ram;......|
    |.(112) ST2000DL003 (2TB) (RAIDZ2)..|.(1) Areca ARC1880ix-8 512MiB Cache..............|...DVDRW; 128GB SSD.......|
    |.(..2) ST9146803SS (146GB) (RAID-1)|.(8) Intel SSD 520 240GB (RAID6).................|...Ubuntu 12.04 64bit.....|
    |.Ubuntu 12.04 64bit Server.........|.Windows 7 x64 Pro...............................|............... ..........|

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •