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Author Topic: RAID 1 or Standard for speed (and backup)?  (Read 3777 times)

alekdavis

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RAID 1 or Standard for speed (and backup)?
« on: March 18, 2013, 12:30:45 AM »
I'm about to install two 3 TB WD Red drives, but I'm not sure which configuration to use: RAID 1 or Standard. I'm planning to use DNS-325 for storing and serving media (photos, music, videos), so read speed is important. I have seen reports indicating that device's RAID 1 speeds are noticeably slower than RAID 0, but I definitely do not want to run it as RAID 0. I'm wondering how RAID 1 speeds compare to standard configuration. If standard is faster, then what would be the easiest way to back up drive 1 to drive 2 (standard backup, folder sync, something else)? I'm on Windows 7 64-bit, but I'm not a huge fan of Windows backup. If standard speeds are close to RAID 1, then I will probably run RAID 1 with periodic backup to an external drive (yes, yes, I realize that RAID 1 is meant for availability and not as primary backup, but I'm not sure how a common example of a corrupt file would also not apply to traditional backup, unless there is a way to get a notification about corrupt files, and I'm not sure how you would get one). Are there BKMs for common usage models? Thanks.
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JavaLawyer

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Re: RAID 1 or Standard for speed (and backup)?
« Reply #1 on: March 18, 2013, 05:55:42 AM »
A good recommendation is to play with different configurations on your DNS-325 to test behavior and performance on your particular network before committing to an approach and storing real data. This strategy will also enable you to better understand how the DNS-325 works and have an easier time troubleshooting should the need arise.
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Find answers here: D-Link ShareCenter FAQ I D-Link Network Camera FAQ
There's no such thing as too many backups FFC

japa-fi

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  • Posts: 23
Re: RAID 1 or Standard for speed (and backup)?
« Reply #2 on: March 27, 2013, 06:23:30 AM »
Note, this requires funplug to be installed.
I have a script that is executed from cron, to create a backup from one drive to another.
Depending on the amount of changed data between the backups, this can store several backups.
each backup is full set of files, but take only the scape of incremental backup. Thanks to hard linking.
Got the idea from "back in time", a backup front-end utilizing hardlinking and rsync to achieve the same.

Code: [Select]
#!/ffp/bin/sh
DATE=$(date +%Y%m%d-%H%M%S)
SOURCE="/mnt/HD/HD_a2"
DEST="/mnt/HD/HD_b2/Mirror"
mkdir -p $DEST
/usr/sbin/rsync -av $SOURCE/ $DEST/Latest/ --log-file=$DEST/rsync.log --hard-links --inplace --delete --exclude=Xclude-from-backup
/ffp/bin/mkdir -p $DEST/$DATE
/ffp/bin/cp -avxl $DEST/Latest/* $DEST/$DATE/

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