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anonymous

Disk IO information with a Unix / Linux background - 0 views

www.dataclinic.co.uk/-io-information-linux-unix.htm

information performance tuning disk io linux sysadmin

shared by anonymous on 20 Aug 10 - Cached
  • The disk's ITR rating and internal cache size can be critical when tuning maxcontig (maximum contiguous I/O size). Note: maxphys and maxcontig must be tuned at the same time. The unit of measurement for maxphys is bytes; maxcontig is in blocks. maxcontig can be changed via the mkfs, newfs or tunefs commands.
  • anonymous on 20 Aug 10
     
    The disk's ITR rating and internal cache size can be critical when tuning maxcontig (maximum contiguous I/O size). Note: maxphys and maxcontig must be tuned at the same time. The unit of measurement for maxphys is bytes; maxcontig is in blocks. maxcontig can be changed via the mkfs, newfs or tunefs commands.
yc c

Clonezilla - 2 views

clonezilla.org

backup software clone opensource linux

shared by yc c on 11 Jan 10 - Cached
  • yc c on 11 Jan 10
     
    Clonezilla, based on DRBL, Partition Image, ntfsclone, partclone, and udpcast, allows you to do bare metal backup and recovery. it can clone many (40 plus!) computers simultaneously. Filesystem supported: ext2, ext3, ext4, reiserfs, xfs, jfs of GNU/Linux, FAT, NTFS of MS Windows, and HFS+ of Mac OS. Therefore you can clone GNU/Linux, MS windows and Intel-based Mac OS, no matter it's 32-bit (x86) or 64-bit (x86-64) OS. For these file systems, only used blocks in partition are saved and restored. For unsupported file system, sector-to-sector copy is done by dd in Clonezilla.
Maluvia Haseltine

Is dd better than cat? - Stack Overflow - 6 views

stackoverflow.com/...is-dd-better-than-cat

Linux CLI

shared by Maluvia Haseltine on 15 Aug 10 - Cached
  • fubar'd
  • 'cat' only knew
  • about character I/O
  • ...6 more annotations...
  • dd' was needed to interact with the block devices,
  • 0 down vote You want to use dd so that you can specify things like bsize
  • tuning this to some multiple of 4k is going to be much faster than cat
  • dd has a number of useful extra features for more complex data copies
  • 2 down vote If I remember correctly, dd is much more "low level" in is approach, skipping such fancy things as filesystems and all the bells and whistles :)
  • dd is problematic in the presence of disk errors, and can hang or more importantly ignore non readable data
  • Maluvia Haseltine on 15 Aug 10
     
    Fascinating discussion over at Stack Overflow. Elucidates some of the subtle differences between dd and cat, and when and why you might want to use one over the other.
Marco Castellani

Linux 2 6 27 - Linux Kernel Newbies - 0 views

kernelnewbies.org/Linux_2_6_27

kernel linux segnalerumore

shared by Marco Castellani on 11 Oct 08 - Cached
  • UBIFS is a new filesystem designed to work with flash devices, developed by Nokia with help of the University of Szeged. It's important to understand that UBIFS is very different to any traditional filesystem: UBIFS does not work with block based devices, but pure flash based devices
  • In this release, Ext4 is adding one of its most important planned features: Delayed allocation (also called "Allocate-on-flush"). It doesn't change the disk format in any way, but it improves the performance in a wide range of workloads.
  • Linux 2.6.27 kernel released 9 October 2008.
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