Package: tiger
Version: 1:3.2.3-10
Severity: wishlist
Dear Maintainer,
In virtualized environnements, tiger could cause I/O storms. An example of bad
situation :
tiger with default conf on 15 VM in a same KVM host.
The first August at 2:00 AM , all VM + the host starts find_files check.
IO load gets very high at 02:01 and other services are impacted.
I think we could imitate apt cron behavior to randomize start time, adjusting
the minute part only. Basicaly they use a sleep $(random 1800).
I this could be done only by altering the tigercron script and adding a
function like the apt one :
>From wheezy default /etc/cron.daily/apt :
# sleep for a random interval of time (default 30min)
# (some code taken from cron-apt, thanks)
random_sleep()
{
RandomSleep=1800
eval $(apt-config shell RandomSleep APT::Periodic::RandomSleep)
if [ $RandomSleep -eq 0 ]; then
return
fi
if [ -z "$RANDOM" ] ; then
# A fix for shells that do not have this bash feature.
RANDOM=$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -c"1-5")
fi
TIME=$(($RANDOM % $RandomSleep))
debug_echo "sleeping for $TIME seconds"
sleep $TIME
}
Maybe this introduce some dependancies like "coreutils" (but seems a common
case).
Regards,
Ludovic
-- System Information:
Debian Release: 7.6
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 3.2.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages tiger depends on:
ii binutils 2.22-8
ii bsdmainutils 9.0.3
ii debconf [debconf-2.0] 1.5.49
ii libc6 2.13-38+deb7u3
ii net-tools 1.60-24.2
ii ucf 3.0025+nmu3
Versions of packages tiger recommends:
ii chkrootkit 0.49-4.1+deb7u2
ii exim4-daemon-light [mail-transport-agent] 4.80-7
ii john 1.7.8-1
ii tripwire 2.4.2.2-2
Versions of packages tiger suggests:
ii lsof 4.86+dfsg-1
-- debconf information:
tiger/mail_rcpt: root
tiger/policy_adapt:
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