Backblaze says higher, others say lower, but sample sizes are in contention on most claims either way. You can then restore any lost data from That Actual Backup You Totally Have(tm).ĭrive failure (false positive or not) on consumer models is still around 10% after 3-4 years always-on use - though you'll find this value contested a fair bit either way. The replacement disks just get treated as adding new disks to the setup, and data is duplicated and optionally balanced across drives in the background. Less downtime as a result, as it can be left operational while failed disks are replaced, and no re-build is needed. However, the RAID5 array breaks until you rebuild - DP keeps working, for data that was not lost entirely, at full speed. Now take losing 2 or more drives at once (and DP set to 2x dupe only). depending on you using a good SAS/SATA controller). Both take about the same time for a given amount of data, but the DP "drive" will work at full speed if needed (obv. DP makes the duplicates as a background process, giving way to file access requests, but only involves disks in pairs at any given time. Losing a single disk under RAID5 vs DP, both are still usable arrays - RAID5 will need to re-build, which is a pretty drive-thrashing process for all the disks.
With Drivepool, it's just a normal NTFS/ReFS drive, accessible without special software.
With RAID, you can't just take a drive and plug it in elsewhere to access files. My bigger reason to not use RAID, is that I also prefer my data to be easily accessible during recovery/repairs or if the RAID controller dies. Others use software SnapRAID set up to function as a data integrity check (scrubbing), on top of the duplication - but I think that over-complicates things. It's possible to combine a drivepool with ReFS instead of NTFS if that's available to you.
Yeah, you're right, and I rushed my reply, sorry. Just make sure to have backups and you won't lose data. THis is a pretty over hyped issues, the real error rates on hdds, are much lower than the rated rates on drive sheets.Īlso drive pool won't really help you here compared to traditional raid, if you have a read error during a rebuilt, you still won't get the data back.
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