is Zevo safe enough?

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Re: is Zevo safe enough?

Post by si-ghan-bi » Thu Nov 08, 2012 8:00 am

grahamperrin wrote:In my few months' use of ZEVO I have:

[list][*]had more than one JHFS+ volume, written by Time Machine, that neither Disk Utility nor DiskWarrior could repair (during that period I ran fsck_hfs extremely frequently; it seems that the irreparable damage to these file systems was sudden)


Bet let's also say that you are unlucky: I never had problems on TM volumes or HFS+ disks in 6 years :)
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Re: is Zevo safe enough?

Post by TomUnderhill » Thu Nov 15, 2012 12:33 pm

si-ghan-bi wrote:Bet let's also say that you are unlucky: I never had problems on TM volumes or HFS+ disks in 6 years :)


I have owned my short-run publishing company for fourteen years or so and my data is my livelihood. Without it I'm worse than unemployed.

I made the switch to Macs and OS X about six years ago. Before that I ran various iterations of Windows.

As I think through the past fourteen years, there are two types of events that stand out:
  • the looks of gratitude on my clients' faces when I deliver their books
  • the absolute terror I feel when I discover a problematic file
It's not always my choice what I feel.

Other than a mechanical hard drive crash that I managed to survive only because of sheer and utter stupidity (I had just migrated to a new system and hadn't yet erased my old drives), I know of three other times I have experienced corrupted hard drive data:
  • two requests from clients for reprints of books I had published three and seven years previously
  • attempting to migrate a computer from Time Machine
Two of these events have been on HFS+, one on NTFS. This list doesn't include the three times I've had single drives in a RAID-5 set fail where I could reconstruct the entire data set with a new drive.

With data that's up to thirteen years old, it's only a matter of time before I find more occurrences of bit rot that has been perpetuated through several different file systems, hardware setups and operating systems.

In no way am I attempting to be a troll. It appears that you find safety in what you have not experienced, whereas I fear what I may not yet have found... and when I do find it, it will be too late.

Time Machine and HFS+ offer me no proactive way to discern (let alone repair) a post-write failure in the file system.
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Re: is Zevo safe enough?

Post by si-ghan-bi » Thu Nov 15, 2012 6:56 pm

In my case I'm a normal home user, but I constantly track my family finances with an app that uses a sqlite3 DB (CoreData). Obviously that kind of file is not as error-tolerant as a JPG image or audio file. I don't want to lose years of records (plus other data, of course) and as soon as I discovered ZFS is available on Mac, I jumped on it.
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databases

Post by grahamperrin » Fri Nov 16, 2012 1:07 am

Ah, yes, DB … just two letters, and the penny dropped. I decided to not waste too much time with a Microsoft-oriented problem that's for me to do at work … 

databases, corruption of files, NTFS, ReFS, ZFS and ZEVO
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Review

Post by grahamperrin » Sat May 18, 2013 1:38 pm

Back to the opening post. Is ZEVO safe enough?

Whilst experimenting with a variety of hardware, some of which was known to be imperfect, I gave this question much thought.

I reckon that Community Edition 1.1.1 is safe, with the following exceptions:


Side note: if USB must be used, it is advisable to make best use of available host controllers – to avoid the problems (not specific to ZFS) that are associated with USB, particularly 2.0. Strategies such as this are discussed in ZEVO and USB2 disks? is it fine? and a variety of other topics.
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