ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
600 KW 120/208 3 Phase Y protection
by SteveFehr. 07/23/17 09:46 AM
1913 American Electrician's Handbook
by gfretwell. 07/20/17 01:08 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,264 Are you busy
174,723 Re: Forum
167,102 Need opinion
Who's Online Now
0 registered members (), 57 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 1 of 2 1 2
#195518 - 08/08/10 02:02 PM Mirrored hard drives  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,099
Estero,Fl,usa
Are you doing this?
It is a great way to keep your stuff backed up without thinking about it. Most SATA controllers have RAID these days so you just install another drive about the same as the one you want backed up and it "mirrors" the original all the time.
Drives are cheap enough that this is not really that expensive. If a drive fails you get a message, swap out the bad drive and the system re-syncs to the new drive. Nothing is lost. You can run single while you are getting your new drive but be aware you are not protected.


Greg Fretwell

Tools for Electricians:

#195522 - 08/09/10 12:17 AM Re: Mirrored hard drives [Re: gfretwell]  
schenimann  Offline
Member
Joined: Feb 2008
Posts: 193
Western North Carolina
I am. Two family members and some friends lost their hard drives in the last few months. They lost pics, documents, and just general everyday stuff.
I bought a 500gig external backup HD for about $80 at Best Buy. I plugged it in and it did all the work. When I change a file, it changes its files. It is cheap insurance and protection for my company and family files.


#195524 - 08/09/10 12:29 AM Re: Mirrored hard drives [Re: schenimann]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,099
Estero,Fl,usa
That is not exactly the same as RAID 1 mirroring but it accomplishes the same thing.


Greg Fretwell

#195525 - 08/09/10 04:53 AM Re: Mirrored hard drives [Re: gfretwell]  
jackolsen  Offline
Member
Joined: Feb 2008
Posts: 21
british columbia canada
I back up my company's books on a usb memory stick.The external back-up drive would give better protection for all my files.Thanks for the good idea.


#195564 - 08/10/10 09:46 PM Re: Mirrored hard drives [Re: jackolsen]  
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,707
Anaheim, CA. USA
I love Striping Drives!!!
(so, answer to Greg's 1st Post is _YES!!!_)

Prior to this Machine, all others were IDE type Drives. Mirroring would require a Drive Controller on the Expansion Bus, along with SCSI Drives - which the costs were > 300% of a "Master / Slave" set of Two IDE Drives.

This was a very Jurassic approach! (manually updating data from the "Master" Drive to the "Slave" Drive), but it did keep a redundant copy of my data + Directories, so when the Drive with the MBRs did fail, data was still arranged per Sub Directory structure.
This dramatically reduced the time and tasks required to get the Machine back in operation, but had more risks than a fully functioning RAID (Redundant Array of Inexpensive Disks / Drives).

__________________________________

Funny - but sad story, per my current Machine...

The Motherboard on this Machine has (6) SATA Drive Controllers built in, and was shipped with a single SATA Fixed Disk ("Hard Drive"), and a SATA CD-RW/DVD-RW+/-.

About 1 year after receiving the Machine, I decided to initiate a RAID Approach - and to do so with a "Clean Slate". So I backed up all data + Directory Structures to DVD-Rs, then performed an Unconditional Format on the original Fixed Disk Drive.
The Original Drive on Controller SATA0 was a Western Digital "Caviar" Series, 320GB SATA.
So I purchased an exactly similar Drive from Fry's, for use on SATA1.
(how many know the story here already???!!!).

Set everything up per RAID Level 1, partitioned the Array for (3) Logical Drives:
C: for OS and Apps (70GB)
E: Data (120GB),
F: Data (120GB),
G: Swap File - 2x capacity of DRAM (10GB)

Then installed everything.

About 1 Month later, Original Drive dies, so it gets removed, and the machine gets setup to use a single Fixed Disk.
Shortly there after, the other drive commits suicide!
That was when I discovered the issues with the WD 320GB Caviar Series SATA Drives.

Current configuration uses (2) Seagate "Barracuda" Series 500GB SATA Drives.

Drive plans for the next Two Frankenstein-ish Machines ("me-Built" not "pre-built"):

a: Backup-Aux machine; RAID Level 1,
b: New File/Server; RAID Level 3 or? (min. 3 disk array)

Scott


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

#195568 - 08/11/10 12:04 AM Re: Mirrored hard drives [Re: Scott35]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,099
Estero,Fl,usa
W/D has by far the highest representation in my pile of bad drives. It is something like 6 to one over the Maxtor and Quantums.
My oldest running drive is a 1.2g fujitsu that lived in my car for 8 years (MP3 player)
I have a Caviar drive with a bullet hole in it. (actually the .380 round hit the hub and bounced off)
Yup I was a little mad at that one.

[Linked Image]


Greg Fretwell

#195569 - 08/11/10 02:30 AM Re: Mirrored hard drives [Re: jackolsen]  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,217
SI,New Zealand
Originally Posted by jackolsen
I back up my company's books on a usb memory stick.The external back-up drive would give better protection for all my files.Thanks for the good idea.

I'd be very careful storing anything mission critical on a USB flash drive.
I have heard of these things dying after the static from peoples clothing (with having the drive in their pocket) has killed the drive.
Maybe it's just a freak thing, but it's not the sort of risk I'd like to take with important data.


Let's face it, these days if you're not young, you're old - Red Green grin

#195570 - 08/11/10 03:49 AM Re: Mirrored hard drives [Re: Trumpy]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,099
Estero,Fl,usa
I have had thumb drives suddenly die on me.


Greg Fretwell

#195573 - 08/11/10 07:22 PM Re: Mirrored hard drives [Re: gfretwell]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,853
Brick, NJ USA
No complaints about my thumbs, at least 12-15 assorted mfg's & capacities.

After reading through this thread, I'm seeing how computer un-savvy I really am!

My backups are on a WD 'My Book' which I manually 'copy' to, as the auto backup that came with it took forever & slowed this LT down big time.

Critical data is either on a CD or a dedicated thumb, and secondarily on the WD My Book.

That's what I like about ECN, ya never stop learning!


John

#195574 - 08/12/10 01:05 AM Re: Mirrored hard drives [Re: HotLine1]  
noderaser  Offline
Member
Joined: Mar 2007
Posts: 404
Portland, Oregon, United State...
I have been fairly lucky over the years, in terms of drive failures. The most recent was just over a month ago, with a Seagate in my Mac Mini; I'm assuming that was a heat-related failure since things are packed pretty tightly in there. The time before that, it was another Seagate almost 10 years ago. I agree that Quantum and Maxtor were both good brands, but unfortunately they're both part of Seagate now. I have some Quantum drives that are over 20 years old and still kicking.

I don't do any RAID currently; my important files are backed up across three different computers using Live Sync, and also on an external 1TB drive using Time Machine on the Mini. That, and the occasional optical backup (usually every three months--much less frequent than I used to do) and I think I'm pretty much covered. The only down-time I experienced with the recent drive failure was waiting for the replacement to arrive and installing software. Of course, this happened between the time the external was ordered, and when it showed up--if I'd already had the external in place, restoration would have taken a couple of clicks.

While RAID is great for enterprise servers where downtime costs big $$$, I don't see it as necessary for the average user. Of course, my perspective may be a little different since I have multiple computers and having one go down doesn't bring everything to a halt.


Page 1 of 2 1 2

Member Spotlight
sbi
sbi
indiana
Posts: 47
Joined: March 2008
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.019s Queries: 16 (0.002s) Memory: 0.8243 MB (Peak: 1.0054 MB) Zlib enabled. Server Time: 2017-07-24 04:49:57 UTC