Ultra2 stops working after boot

Hello.

My RNDU2220 works fine since.... a lot of years

Last month, after a long global power outage (UPS out of battery), the NAS runs strangely. It hangs just after the boot.

Here's a sample of the "/var/log/messages" copied quickly by SSH :

Mar 10 05:30:52 nas-C1-4E-C8 kernel: ata1.00: configured for UDMA/133
Mar 10 05:30:52 nas-C1-4E-C8 kernel: ata1: EH complete
Mar 10 05:30:52 nas-C1-4E-C8 kernel: ata2.00: configured for UDMA/133
Mar 10 05:30:52 nas-C1-4E-C8 kernel: ata2: EH complete
Mar 10 05:30:52 nas-C1-4E-C8 kernel: Adding 524272k swap on /dev/md1. Priority:-1 extents:1 across:524272k
Mar 10 05:30:52 nas-C1-4E-C8 kernel: EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts: acl,user_xattr,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv1
Mar 10 05:31:00 nas-C1-4E-C8 RAIDiator: System is up.
Mar 10 06:16:21 nas-C1-4E-C8 RAIDiator: Veuillez redémarrer votre NAS pour poursuivre le processus de mise à jour.
Mar 10 06:17:06 nas-C1-4E-C8 RAIDiator: Veuillez fermer cette fenêtre de navigateur et utilisez RAIDar pour vous reconnecter au périphérique. Redémarrage du système ...
Mar 10 06:17:06 nas-C1-4E-C8 RAIDiator: Redémarrage du système
Mar 10 06:17:11 nas-C1-4E-C8 shutdown[10298]: shutting down for system reboot
Mar 10 06:17:12 nas-C1-4E-C8 kernel: ata1.00: configured for UDMA/133
Mar 10 06:17:12 nas-C1-4E-C8 kernel: ata1: EH complete
Mar 10 06:17:12 nas-C1-4E-C8 kernel: sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
Mar 10 06:17:12 nas-C1-4E-C8 kernel: ata2.00: configured for UDMA/133
Mar 10 06:17:12 nas-C1-4E-C8 kernel: ata2: EH complete
Mar 10 06:17:12 nas-C1-4E-C8 kernel: sd 1:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
Mar 10 06:17:14 nas-C1-4E-C8 exiting on signal 15

 This (translated) passage is strange :

RAIDiator: System is up.
RAIDiator: Please restart your NAS to continue the update process.
RAIDiator: Please close this browser window and use RAIDar to reconnect to the device. System restart ...
RAIDiator: System restarting

The system hasn't been updated for a long time. So...why this and now ?

I don't know if there's a hidden flag/parameter somewhere, like a "/.update" or "/.readynas_update".

I'll try to search how to intercept the call who creates a shutdown request, to investigate longer.

Julien.