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Forum Discussion
Ready NAS 100 Resync after power outage
Hi all, I am a new owner of a ready nas 100-4 so I'm not really expert on this platform as so far I always owned and worked with different hardware than this. I installed my disks (3x3TB WD-R...
The RAID is at a lower level than the filesystem and the disks need to be synced sector by sector to setup the RAID. Please note that the initial sync is a special case where the volume is redudant throughout.
The 100 series products are cost effective. We have higher performance options available.
Which firmware are you running?
Which services and apps are you running?
The system is designed to handle unsafe shutdowns. After some unsafe shutdowns there may be some concerns about the state of the array, so as a precaution in such cases a resync is triggered to make sure the disks are in sync. This would be advisable regardless of what system you are using. We want to minimise the risk that a single disk failure would result in the array being lost. The redundancy of RAID-5 is only effective if the disks are properly synced. If for any reason they are not then a single disk failure may cause problems.
Of course important data should be stored on multiple devices. If the only copy of your data is on the NAS then that data is not backed up. Sadly some users have misconceptions as to what benefits RAID provides. See Preventing Catastrophic Data Loss
The suggestion to get a UPS is a good one. If you get a UPS and connect it to the NAS via USB (in addition to plugging the power cable from the NAS into the UPS, of course) then the unit can be shutdown gracefully by that in the event of a power failure.
Welcome to the Community!
Dear mdgm, thanks for your fast reply.
I understand the raid happens on a lower level than a FS, and for any I/O operation the sync keeps happening in the background. The thing is that there wasn't any I/O operation happening since the sync finished as I was not at home.
The machne was completely IDLE.
To make the sync performing better, I stopped every service except SSH and HTTP to continue to manage the device so at the moment, while it's resyncing again, the only running services are SSH and HTTP.
My firmware version is 6.4.1 and should be the last one.
Is there any way to understand why this resync happened? Is there any log I can check?
ThanksAccio
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