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Status Not under consideration
Workspace AIX
Created by Guest
Created on Jan 2, 2018

Automated JFS2 filesystem size growth/shrink

Would like the JFS2 filesystem implementation to be changed so it automatically grows or shrinks based on customer-defined percentages of minimum or maximum size.

Idea priority Low
  • Guest
    Reply
    |
    Apr 9, 2020

    IBM has evaluated the priority of this enhancement proposal relative to other future product content and determined that this RFE will not be pursued for a future product release.

  • Guest
    Reply
    |
    Jan 6, 2018

    This seems more like a monitoring thing than an operating system thing.
    Also, handling this as a thin LUN is probably better where possible.
    Here is an example script.

    Potential improvements:
    * Notifications on exceptions
    * Config file to track different settings per filesystem
    * Also check iused / ifree to handle tiny-files
    * Run as a daemon vs from cron.
    * Explicit lists of filesystems, or include/exclude lists

    #!/bin/ksh
    ###########
    # Run this from cron every minute to automatically resize JFS2 filesystems
    # Incorrect limits could cause size flapping for small filesystems.
    # We skip things we cannot reduce.

    MINFREEPCT=10
    MAXFREEPCT=70
    MINPPFREE=10

    LVLIST=`mount | grep jfs2 | grep /dev/ | awk '{print $1;}' | cut -f 3 -d /`
    for lv in $LVLIST ; do
    df -gv 2>/dev/null | grep $lv | read device size used free pct iused ifree ipct mountpoint || continue
    FREEPCT=$(( $used * 100 / $size ))
    VG=`lslv $lv 2>/dev/null | grep "VOLUME GROUP:" | awk '{print $6;}'`
    PPSIZE=`lsvg $VG 2>/dev/null | grep 'PP SIZE' | awk '{print $6;}'`
    [[ $PPSIZE -gt 0 ]] || continue
    #
    if [[ $FREEPCT -lt $MINFREEPCT ]] ; then
    FREEPPS=`lsvg $VG | grep FREE | awk '{print $6;}'`
    [[ $FREEPPS -gt $MINFREEPPS ]] && chfs -a size=+1 $mountpoint
    continue
    fi
    #
    [[ $FREEPCT -gt $MAXFREEPCT ]] && chfs -a size=-$PPSIZE $mountpoint
    #
    done