Ext3 Barrier Support

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ext3 - Wikipedia

    https://en.wikipedia.org/wiki/Ext3
    ext3, or third extended filesystem, is a journaled file system that is commonly used by the Linux kernel.It used to be the default file system for many popular Linux distributions. Stephen Tweedie first revealed that he was working on extending ext2 in Journaling the Linux ext2fs Filesystem in a 1998 paper, and later in a February 1999 kernel mailing list posting.Developer(s): Stephen Tweedie

ext3 write barriers and write caching - Andryan's Random Notes

    http://blog.nirkabel.org/2008/12/07/ext3-write-barriers-and-write-caching/
    Dec 07, 2008 · The ext3 barrier option is not enabled by default on almost all popular Linux distributions, and thus most distributions are at risk. In addition, filesystems going through the device mapper interface (including software RAID and LVM implementations) may not support barriers, and will issue a warning if that mount option is used.

22.2. Enabling/Disabling Write Barriers Red Hat Enterprise ...

    https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/storage_administration_guide/writebarrieronoff
    However, because the cache's volatility is not visible to the kernel, Red Hat Enterprise Linux 6 enables write barriers by default on all supported journaling file systems. For devices with non-volatile, battery-backed write caches and those with write-caching disabled, you can safely disable write barriers at mount time using the -o nobarrier ...

What's Barriers, how to enable/disable it on Linux ...

    http://www.fibrevillage.com/storage/565-what-s-barriers-how-to-enable-disable-it-on-linux
    Oct 24, 2016 · What's Barriers, how to enable/disable it on Linux Write Barriers A write barrier is a kernel mechanism used to ensure that file system metadata is correctly written andordered on persistent storage, even when storage devices with volatile write caches lose power.

How safe is nobarrier and ext4 ... - Proxmox Support Forum

    https://forum.proxmox.com/threads/how-safe-is-nobarrier-and-ext4-huge-fsync-performance-difference.17717/
    Feb 12, 2014 · Hi, I've a proxmox, with pvetest repo, kernel 3.10, for a school where I've installed 2 Samsung EVO840 250GB SSD, both formatted as EXT4. I've seen in some post that the bad fsync performance with ext4 and ssd was due to TRIM command, …



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