On 03/11/2012 08:12 PM, Scott Walker wrote:
> What do you guys recommend for backing up a small CentOS server in a
> business environment. It will have (3) 300gb drives in a raid 5 array but I
> don't anticipate more than about 25gb of data that needs to be backed up
> each night.
> I want a lot of backups with a rotation scheme that included daily, weekly,
> and monthly copies. I want the daily copies of the data kept until the next
> week, and the weekly copy being kept for four weeks, and the monthly copies
> being kept for a year.
>
> The vendor is recommending a RD1000 Removable Disk device. This looks like
> it has great specs. Each cartridge holds 160gb (non-compressed) and the
> drive costs about $420 but seems that with each removable cartridge costing
> $128, we may be limited to how many cartridges we could have, thus perhaps
> not retaining backup instances as long as I like.
>
> I asked about a HP DAT160 tape drive. Each tape holds 160gb
> (non-compressed) and the drive costs about $730, and each tape only costs
> about $24, so it would be economical to have lots of backup instances saved
> for a long period of time.
>
> I have been using tape and the backup rotation scheme mentioned above for
> over 20 years. The vendor is telling me they don't recommend tape drives
> anymore and all of their customers are using removable hard drive for local
> backups. Am I missing something? My instincts tell me the tape drive is
> the right solution for a system with a small amount of data, where the
> system is used only from 8am - 5pm (so backup speed is not critical) and
> where we want to save backup instances for a long time before overwriting
> them.
>
> Any input would be welcomed.
>
>
What do you consider to be a "long time" to keep backups on hand?
Tape, and tape drives, have a bad reputation. They are difficult and
time consuming to verify.
I run my backups nightly to a hard drive using rsync. I use a directory
named by the day of the week. I cycle through the seven daily
directories until the 1st of the month when I run a complete backup to
an monthly directory. Then for the next seven days I wipe the daily
directories and start the cycle over again.
A couple of minor variations to this plan should work for you. I don't
know what your network configuration looks like so this may not apply to
you.
Here's a peek at the logic I use.
# BUILD DATE STAMP
Date=`date +%Y%m%d`
echo "Date= \"$Date\""
# Rev. 5.6 start
Day=`date +%a`
echo "Day= \"$Day\""
DayNum=`date +%d` # Rev. 7.0
# IF THIS IS A SUNDAY USE THE CALANDAR DATE
if [ "$Day" == "Sun" ];then
Day="$Date"
else
# IF THIS IS THE 1ST OF THE MONTH USE THE CALANDAR DATE
if [ "$DayNum" == "01" ];then
Day="$Date"
fi
fi
# USE THE DAY OF THE WEEK, EXCEPT FOR SUNDAY AND THE 1ST OF THE MONTH
WHICH IS HANDLED ABOVE, AS THE DIRECTORY NAME
Date="$Day"
# Rev. 5.6 end
# REMOVE PREVIOUS $Date DIRECTORY IF THIS IS THE FIRST USE THIS MONTH
# Rev. 7.0 ENTIRE CASE STATEMENT ADDED
case $DayNum in
02)
echo "Removing /home/homebu/$Date directory"
rm -rf /home/homebu/$Date
;;
03)
echo "Removing /home/homebu/$Date directory"
rm -rf /home/homebu/$Date
;;
04)
echo "Removing /home/homebu/$Date directory"
rm -rf /home/homebu/$Date
;;
05)
echo "Removing /home/homebu/$Date directory"
rm -rf /home/homebu/$Date
;;
06)
echo "Removing /home/homebu/$Date directory"
rm -rf /home/homebu/$Date
;;
07)
echo "Removing /home/homebu/$Date directory"
rm -rf /home/homebu/$Date
;;
*)
echo "Old $Date directory not deleted"
;;
esac
# TRANSER FILES
--
_
°v°
/(_)\
^ ^ Mark LaPierre
Registerd Linux user No #267004
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