Raid 1 format recovery

[deconstruct60]

What's the difference between RAIDZ2 and a nice battery backed RAID controller with a RAID 5 or 6?

The vast majority of RAID controllers aren't going to store redundant copies of your RAID meta data. Neither do they checksum all the way from RAM all the way down to the platter. The "holistic" ZFS approach in general coupled to the transactional recording. Another ZFS system can read/write these drives; not locked into a particular implementation.

On the other hand, the RAID cards do offload a fair amount of processing off the the CPU cores and main RAM.

Operator errors on either one of them (e.g., "zfs nuke this pool" or "RAID card reformat this set" ) isn't going to save the data. They are designed around failures of the other underlying storage hardware not the operators.

 

[Draeconis]

What's the difference between RAIDZ2 and a nice battery backed RAID controller with a RAID 5 or 6?

• Doesn't suffer from the write hole issue.
• Doesn't require a separate card, all operations are done in software (albeit with some system requirements).
• (In my experience) much more simple and granular to set up and maintain, and move between machines.
• Convenient and efficient to back up (via zfs send).
• Doesn't require fancy enterprise drives to run properly.

 

[SDAVE]

If you mean the Apple Raid Card for Mac Pro, rethink your other options! I have never had such a terrible Apple experience as with that WAY OVERPRICED piece of computer hardware! Waste of money and time...

Now a very happy soft-raider RAID0 and 1 on Mac Pro with a very tight back-up scheme on RAID1 external CCC backups and a 24 TB Synology NAS for files etc. Of course I run an offsite backup too!

Cheers

No I have a separate 24tb Dell T320 8 bay server with 24hr tape backup on rotation connected via gigabit.

 

[SDAVE]

Just an updated, it can't be recovered
I tried everything myself. I sent to DriveSavers too and they couldn't even recover.

God, Core Storage is a nightmare. Thanks Apple!!!!

 

[chabig]

Thank you for the update. I'm sorry about your data loss.