Full Discussion: Wrong Array...
The Lounge War Stories Wrong Array... Post 303026952 by Peasant on Wednesday 5th of December 2018 12:11:56 PM
I have similar story regarding UPS, diesel motor and not so automatic power switch Smilie
Needless to say i got a call in 3 in the morning, jumped on my bike, drove to DC to see sweaty engineers with laptops everywhere.
The senior management was also there, breading behind our necks - which did not speed up the process, rather slowed it down.

So i joined the party and started breaking sweat, to find some NFS clustered UFS filesystems needed fsck (big filesystems), but the clusterware timeout happend due to lasting to long.
Then when timeout occurred, the package was switched to another node, started fsck again ... nightmare loop to say.

Was happy since i prepared ZFS some days ago and clustered to do migration to new storage, so i offlined and unmanaged the package in question, mounted the UFS in read only and ran couple of rsyncs.
By the time everything else got up, everything but couple of TB filesystems mostly used for archive, were done.
The NFS was accessible immediately so apps can write, but data was continuously pouring for the rest of the day, and checksuming in the days that followed Smilie

It went pretty well (no major consequence in general, except downtime), for which part i blame enterprise storage batteries which held the data in cache and flushed it to disks when powered back on again.
Among other things, since this was a extremely mixed environment hardware and operating system wise.

Regards
Peasant.
This User Gave Thanks to Peasant For This Post:
 
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FSCK_MSDOS(8)						    BSD System Manager's Manual 					     FSCK_MSDOS(8)

NAME
fsck_msdos -- DOS/Windows (FAT) filesystem consistency checker SYNOPSIS
fsck_msdos -p [-f] filesystem ... fsck_msdos [-fny] [-x snap-backup] filesystem ... DESCRIPTION
The fsck_msdos utility verifies and repairs FAT filesystems (more commonly known as DOS filesystems). The first form of fsck_msdos preens the specified filesystems. It is normally started by fsck(8) run from /etc/rc during automatic reboot, when a FAT filesystem is detected. When preening file systems, fsck_msdos will fix common inconsistencies non-interactively. If more seri- ous problems are found, fsck_msdos does not try to fix them, indicates that it was not successful, and exits. The second form of fsck_msdos checks the specified file systems and tries to repair all detected inconsistencies, requesting confirmation before making any changes. The options are as follows: -f This option is ignored by fsck_msdos, and is present only for compatibility with programs that check other file system types for consistency, such as fsck_ffs(8). -n Causes fsck_msdos to assume no as the answer to all operator questions, except ``CONTINUE?''. -p Preen the specified filesystems. -x snap-backup Use a snapshot with snap-backup as backup to check a read-write mounted filesystem. Must be used with -n. See fss(4) for more details. The point is to check an internally-consistent version of the filesystem to find out if it is damaged; on failure one should unmount the filesystem and repair it. -y Causes fsck_msdos to assume yes as the answer to all operator questions. SEE ALSO
fss(4), fsck(8), fsck_ffs(8), mount_msdos(8) BUGS
fsck_msdos is still under construction. BSD
April 11, 2010 BSD

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