Backup Vs RAID | Basic Explanation
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- Опубліковано 22 вер 2018
- Finally, the difference between Backup and RAID is explained in simple terms that anyone can understand. I've also explained the difference between RAID 1, 5, 6 and 10.
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I honestly appreciate the explanation in layman's terms. It just makes me understand Raid even more
You are very welcome Kachetu.
Great explanation Dr Tiv. One of the key things that your subscribers should consider as well, is the recovery from the backup system.
- The type of backup will determine how quickly you can recover from a major failure, and thus, how long a practice is offline from seeing patients...
- How often are backups occurring - this will determine how much data loss you will have in the event of an emergency (i.e. was your data backed up 2 days ago or 2 hours ago?)
Redundancy in drives is very important in keeping your practice operational (depending on what other systems you have in place), but the recovery from backup is vital. You don't want a recovery to require a rebuild of servers, reinstallation of all software BEFORE recovery of data - causing greater then needed outages.
This is very true Slade isn't it. In this day and age, the other question that medical practice owners need to ask is "How long will it take for my backups to be retrieved and used again?" Then the follow on question is "Can I afford to have the practice offline until that time?". Answering these two question will help clarify how much backup and especially redundancy you are after.
very nice video! Thanks for the clarification!
I don't understand. If I use RAID 1 and ONE of those 2 discs fails (mechanical failure), I still have the other disc as a back-up. Now I can use it to restore the data to a new disc, no? So it IS a back-up. It's just dependent on how you use it, I would say. ...Sure, if you have to fear that a spy (??) somehow erases your complete(!) Raid1 (both discs), it won't help. Also if I erase one disc by accident (so by stupidity) ...but come on, when does this ever happen to normal people? ...Please tell me what I don't understand, because I really want to understand and get a safe solution with my data.
This is a common statement Kiryk that many people make so let me try and clarify things. RAID is a mechanical failure backup but NOT a data failure backup. So as you said, if you have two disks in RAID 1 and one mechanically fails then you are fine. However, RAID won't help if you have data failure. Imagine working on a file and the power goes off mid way through a save. You open up your document and it's corrupted. Because in RAID 1 the file is copied exactly to the other disk, both disks now have a corrupt file that is unusable.
Now image, an even worse issue of being hit by ransomeware. I'm not sure if you know what this does, but it's like a virus that locks all your files with an unbreakable password. Again as all RAID will copy the data exactly, all the files on all the disks in the RAID will now be locked by the ransomware. You'll have no option but to pay the hackers to get your files back. This has happened to many businesses so it does happen often. However, if you had a true back-up where your data was copied and stored separately, then both the corrupted file and the locked files can be retrieved (even if an older version) and you haven't lost everything.
I hope that makes more sense. If it doesn't let me know and I'll try explaining it another way :-)
DrTiv Thanks for the answer. Ok, so RAID1 is NOT safe if things occur which most likely “never” occur ; ) Power blackout, ransomware and corrupt data sure sound bad but out of those I personally only experienced corrupt data while saving, so far ...and that happened only twice in over 20 years, so knock on wood...
But in this particular case mentioned (If an error occurs while saving and the app shuts down) there is just nothing you can do anyway.
I guess RAID1 will be ok for my purposes.
Thanks again!
@@mr.k905, backup is like insurance. If you take it, you hope you never have to use it. But those rare times that you need to use your insurance (usually very bad circumstances) you are always so glad you had it. There are no right or wrong answers here, it's just information to help people make an informed decision. Good luck and keep in touch - Dr Tiv :-)
@@mr.k905 you need backup in case you delete your files, which happens pretty often (happened to me recently). as a rule of thumb, get a back up first, then mess around with your discs.
the I on RAID stands for Independent , not inexpensive
Thanks for your comment Leo. I did some research and I believe we may both be right. en.wikipedia.org/wiki/RAID
@@DrTiv huh , well I would not take a Wikipedia as valid source for fact checks , as you know any college researches does not even allow this site for content source, but I can tell you for a fact , RAID arrays is not inexpensive is the opposite
Yes, it can't be reiterated enough, RAID IS NOT BACKUP!! It's why I only use RAID 0 and JBOD. because I'm not dependent on needing my data 24/7.
I'm amazed consumer level customers get hoodwinked into utilizing RAID. It's often a PITA to resolve a RAID failure for the inexperienced user and decreases your storage capacity. It's only necessary if your job depends on accessing that data continuously. If you have a file server, stop using anything other than RAID 0 and backup somewhere else. Trust me you'll thank me one day.