do you data scrub your NAS?

[Marzipan]

I've just setup my Synology DS423+ with 4x 8TB HDD in SHR-2, which is essentially RAID 5 with a hot spare. anyhow, now that that is done, it wants me to do a data scrub, and it says that should be done as some form of routine maintenance. I have no issues with that, but the data scrub is going to take 12 hours! why would it take that long for empty drives? there's nothing on it to corrupt and correct>

 

[lowfat]

I don't know anything about Synology. But scrubs are very importante w/ ZFS as it validates parity checksums. I full scrub once a month.

 

[Marzipan]

I don't know anything about Synology. But scrubs are very importante w/ ZFS as it validates parity checksums. I full scrub once a month.

how many TB do you have to scrub and how long does it usually take? does it get faster over time or about the same length every run?

 

[Shadowarez]

same once a month or more if im working 20+ days in a month ill scrub twice 108tb of data takes about 4+days each time.

just started one tonight been 8 hrs im at 0.65% lol

 

[gingerbee]

I use driverpool+snapraid, snap raid is the parity software I do data scrubs every time I add new data IE scrub new data only and every couple of weeks I do a 20% scrub and every 3 months I do a full data scrub without doing it you don't know that your parity data is 100% correct.

I have 40tb to scrub it takes 8-12 hrs to fully scrub

 

[CMetaphor]

Is scrubbing just a ZFS thing? Never read anything about NTFS file servers needing them... so I haven't? My FS is actually in a pretty bad state at the moment, so I'm retrying to be very gentle with it until I can get a full emergency backup done on it. But if scrubbing will help, I'll consider it...

 

[gingerbee]

Is scrubbing just a ZFS thing? Never read anything about NTFS file servers needing them... so I haven't? My FS is actually in a pretty bad state at the moment, so I'm retrying to be very gentle with it until I can get a full emergency backup done on it. But if scrubbing will help, I'll consider it...

I can't speak on anything but ZFS and NTFS since those are the file systems I have used, but with NTFS and Snap Raid if you don't scrub the data you have no idea if the parity data is intact and can be used properly to restore your lost data. To my understanding, it only affects parity data, not storage data. a scrub compares the parity to the storage data. No, I don't think it is a ZFS-only thing since snap raid uses NTFS, I think it's for anything running a parity for recovery since many scrubs work differently, IE raid vs snap raid vs ZFS.

I am not a huge data guy so if anything I said here is wrong pls feel free to correct me. I use NTFS to make it easy for my wife to use are archive server if need be.