Altirium logo

Posts Tagged ‘Exchange recovery’

Data recovery from a partially rebuilt RAID

I’ve often heard it said, “the RAID has been rebuilt – the data cannot be recovered” and often this is the case. With RAID5, if the configuration is changed, and new parity is calculated, then there will be a significant loss of any data that was previously stored on the RAID.

As Hamlet so eloquently put it “There are more things in heaven and earth, Horatio, than are dreamt of in your philosophy.”, just because something is outside of our normal experience does not mean that it is not possible.
Read the rest of this entry »

VN:F [1.9.22_1171]
Rating: 7.0/10 (3 votes cast)

Recover a bit but lose a block

When attempting a data recovery from a Microsoft Exchange email server after a catastrophic failure, and when I say catastrophic I mean, no backup to restore from and file system corruption or file deletion that has rendered the Exchange information store files inaccessible, one of the tools in Altirium’s data recovery arsenal was to trawl the entire disk or RAID volume and identify pages of Exchange data and rebuild the information store from the ashes. However when Microsoft engineers decided to change their page error correction method so that they could correct a single bit error in a page this seemingly minor ‘upgrade’ had dramatic effect in the ability to identify Exchange page data.

Read the rest of this entry »

VN:F [1.9.22_1171]
Rating: 8.0/10 (1 vote cast)