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RN204 How much storage should be free 4 x 1tb Raidar Report using raid 5
How much free space should this show using raid5 and 4 x 1tb drives. System shows healthy. See bottom three screen captures
Raidar diagnostics reports this below. Does this report indicate only 3 of the 4 volumes are functional?
Successfully completed diagnostics
System
Disk 2 has 1 Reallocated Sectors
Disk 2 has 1 Reallocation Events
Disk 3 has 2 Command Timeouts
Logs
2023-10-22 12:31:17: md/raid:md127: raid level 5 active with 3 out of 4 devices, algorithm 2
I'm not sure that anything is actually wrong right now.
If you want me to take a look, you can download the full log zip file, and then put it into cloud storage (dropbox, google drive, etc). Send me a PM with a link to the full zip, making sure the link permissions allow anyone with the link to download. Don't post it publicly, as there is some privacy leakage.
Note you can't attach a zip file in the forum, so you need to provide a download link instead.
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ctxuk wrote:
How much free space should this show using raid5 and 4 x 1tb drives.
This question isn't related to disk health.
4x1TB RAID5 yields a 3 TB volume. However, the NAS reports total space in TiB (1024*1024*1024*1024 bytes), not TB (1000*1000*1000*1000). 3 TB is the same as 2.72 TB. That is about what your volume shows - 2.54 TiB of free space, plus about another 0.18 TiB for the data + snapshots.
ctxuk wrote:
System
Disk 2 has 1 Reallocated Sectors
Disk 2 has 1 Reallocation Events
Disk 3 has 2 Command Timeouts
Logs
2023-10-22 12:31:17: md/raid:md127: raid level 5 active with 3 out of 4 devices, algorithm 2The fact that one disk is not in the array is particularly concerning. The volume should be reported as degraded - is that currently the case? (it clearly wasn't when you took your screenshots).
A single reallocated sector isn't a huge issue, and neither are 2 command timeouts. Worth watching, to see if the numbers increase.
If you don't have a backup of your files, you should put a backup plan in place. RAID is not enough to keep data safe.
Once the data is safe, I suggest running the disk test from the volume settings wheel. There will be a log entry when it completes. Then look at the stats again.
Test started but not completed by time finished composing this. May have to restart that in the morning.
Think my first use of the RN204 was on 21st 10 2023
It immediately informed it had one degraded volume on disk 4 that was noticed, bear in mind my not ever using any nas previously.
Alerts were setup that day but recall deleting bunch of stuff as got so many over period of days, below is a timeline of events still hold alert emails for.
Please bear in mind when you read them they are in the correct order they arrived in. The time never set correctly at first and had to alter the time zone, thought at first it was something to do with lack of any summer time setting, eventually switched out where it connected the time update location.
Sat 21/10/23 18.47 If you receive this message, the email alert notification is working properly.
20.54 Volume Vertig0 is resynced.
Sun 22/10/23 10.42 Volume Vertig0 is Degraded.
12.32 Volume Vertig0 is Degraded.
12.32 Resyncing started for Volume Vertig0.
15.25 Volume Vertig0 is resynced.
15.25 Volume Vertig0 health changed from Degraded to Redundant.
14.26 Disk in channel 4 (Internal) changed state from RESYNC to ONLINE.
15.25 Disk in channel 4 (Internal) changed state from RESYNC to ONLINE.
The next day after having disc 4 drop out both days another identical disc was ordered. It then seemingly has behaved itself since then and is in disc 3 slot now (noticed it’s ATA errors so know which disc is which by that) Why later after online reading thought maybe a drive bay fault which is said to be common hence bay switch for the disc. The ATA errors have not increased and disc 3 put into slot 4 has still got zero errors for that, as too the other discs. [nb the disc which was ordered was put into my Qnap temporarily to get that setup after the lack of apps on here and the cumbersome uploads to it. RAIDar makes doing that so much quicker, glad managed to find that and install it on 31/10/23.
Not been using it the last week or so for 2 reasons, getting the Qnap setup and to see if powering this RN204 off and unplugging it makes it lose the raid array or not over extended periods of time. Do not wish to waste money powering a device not being used.
On arrival all discs were clean formatted and no raid setup.
Do not understand why all the volumes show the green block indicating that they are “Spare” and not just all blue blocks as per the “Raid” square.
RAIDar was downloaded and installed 31/10/23.
Disc 1
Disc 2
Disc 3
This originally was disc 4 in the array when it arrived.
The ATA error count has not increased at all.
Disc 4
This originally was disc 3 in the array when it arrived.
Meant to include these screens from RAIDar too. Note the lower one reads exactly the same today as yesterday despite doing a rescan.
What shows (from the NAS shell) /proc/mdstat ?
root@RNxxxx:~# cat /proc/mdstat
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