You are here


My Revised Backup Mechanism

RAID towerI've posted a lot of now-obsolete descriptions of how I used RAID to do multiple off-site backups of my computer. Originally my process was built around my now-obsolete Mac Pro computer with its rack of removable hard drives.

My new computer does not contain such a rack, so I bought a USB-3 drive bay that holds up to 4 hard drives and provides built-in RAID and drive mirroring. 

I've also signed up with CrashPlan to do off-site backup. I like CrashPlan because the backups are encrypted and they don't think it's their business to keep a copy of my backup's encryption key. This isn't because I have some mania for secrecy. It's to keep the backup compnay honest. If they can't possibly look at my information then they won't be tempted to do so. A "free" backup service, on the other hand, may examine your files and sell the information they find to market research firms.

Wordpress tag: 
Post category: 

OS X Lion: No encrypted RAID after all

Full disk encryptionI installed Lion last night and spent today figuring out what does - and does not - work. As a huge fan of full-disk encryption (FDE), I'm disappointed in their drive encryption.

RAID may have been improved, but Lion's encryption features, including Time Machine encryption, are not compatible with Apple's RAID.

The diagram at right (from Elementary Information Security) shows how full-disk encryption (FDE) typically integrates into the system software. The diagram doesn't show where the RAID software might reside. I'd expect it to be very closely tied to the device driver. However, it appears instead that Apple placed the FDE below the RAID software. Perhaps this improves performance, or perhaps the choice was driven by design decisions invisible outside Cupertino.

The Time Machine improvement: they have explicitly documented how to switch in a new mirrored drive for an old one. I haven't tried their suggested process since the upgrade. I'd tried the suggested process a couple of years ago, only to have it fail. So we'll see how it goes.

Post category: 

RAID Backups Redux: Snow Leopard

Grumble, grumble.

There has been an update to the DiskUtil program that prevents my RAID backup procedure from working.

The version I am running - Version 11.5.2 (298.4) - no longer provides a "Remove" or "Demote" function when a RAID drive is missing or offline. I've found two ways around this. I recommend the first approach for regular use. The second is only provided to illustrate a bizarre feature of Apple RAID.

Wordpress tag: 
Post category: 

RAID Backups with Snow Leopard

[SEE UPDATE due to changes in a Snow Leopard patch]

I've finally completed a whole RAID 1 backup cycle with Snow Leopard and I can reliably report on how it works.

The process, when performed reliably, is essentially unchanged from earlier versions of Mac OS X. [Details added 3/4/11].

Specifically, you must never attach an old software RAID 1 drive to the working RAID 1 set. If the set was missing a drive ("degraded") before you attach the  drive, it will treat the new drive as part of the set. THIS IS BAD.

You must always erase a drive's partition header completely before adding it back in to a RAID set. Otherwise it's misidentified as being an up-to-date part of the RAID 1 set even though it may not have been updated in months.

I had thought that changes made to RAID handling in Snow Leopard might have fixed this problem. Nope.

Post category: 

RAID on Snow Leopard

Apple Snow LeopardI had avoided upgrading to Snow Leopard for several months, and finally completed the upgrade a few weeks ago. It went mostly without trouble, though there were a few minor things that needed to be fixed.

However, I was greeted with "new and improved!" RAID support which, as usual, provides only the most terse of directions. I rely on mirrored RAID to construct off-site backups. When I went to apply my procedure to Snow Leopard, I had to figure out the difference between "Delete" and "Demote" in order to get my backups rebuilt.

[Here's a more recent post to address the disappearance of "Demote"]


Wordpress tag: 
Post category: 

MS Word versus Framemaker

I've been using Framemaker to create large documents for almost two decades. I'm currently participating in an email discussion group of Frame users, and someone asked about comparing Microsoft Word and Frame. Someone else suggested Googling for the answer, since lots of people like to talk about it.

So, here is my own contribution to the question.


REAL Portable File System for Mac?

My first-order attempts to put a modern portable file system on a portable USB device have failed. The Mac, of course, has its own, proprietary file system. OS X has limited support for the Windows NTFS, so my first attempt was to try to use NTFS. This has failed, though it worked for a few months first.

For some incomprehensible reason, OS X will not mount my portable hard drive if it is formatted in NTFS. It doesn't matter whether I format it using the OS X Disk Utility or if I format it using Windows itself. It doesn't matter if I do fast or slow formatting. Even worse, I can't use my third party NTFS file software (Paragon's package) with it. Nothing works.

Wordpress tag: 
Post category: 

RAID and Backups

A recent Handler's Log on the SANS Internet Storm Center spoke of the recent demise of an early blog site called "" Evidently their disaster recovery strategy consisted of maintaining a mirrored RAID system.

I've written quite a bit about how mirrored RAID is a fundamental part of my disaster recovery strategy. However, the Journalspace people apparently skipped an essential step: they relied solely on their on-line data and didn't keep an off-line (preferably off-site) backup.

Post category: 

Macintosh Mail - Please Get Serious

OK, I switched to Mac e-mail last summer on Mac OS X 10.4 (Tiger, or some other pussy cat). I tolerated the bumbling of the e-mail software since I knew version 10.5 would be out soon, and no doubt they'd fix the lame bits of the software by then.

But I was disappointed. Mail is just as lame in 10.5 as it was in 10.4.

Wordpress tag: 
Post category: 

Apple Hates RAID?

I (think I) have just finished upgrading my system to OS X 10.5. I'm hesitant to declare it a success because I haven't tried everything yet, though I've been reading e-mail and doing most 'normal' things. Apple made it difficult, but not impossible, thank goodness.

According to the documentation, all you do to move from 10.4 to 10.5 is an 'upgrade.' Perhaps this is true for someone, but evidently not for foolish people like myself who value reliability enough to RAID the system volume.

Wordpress tag: 
Post category: 


Theme by Danetsoft and Danang Probo Sayekti inspired by Maksimer