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The Lounge War Stories Wrong Array... Post 303026952 by Peasant on Wednesday 5th of December 2018 12:11:56 PM
Old 12-05-2018
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:
 
Test Your Knowledge in Computers #61
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GSIGNAL(3)						     Linux Programmer's Manual							GSIGNAL(3)

NAME
gsignal, ssignal - software signal facility SYNOPSIS
#include <signal.h> typedef void (*sighandler_t)(int); int gsignal(signum); sighandler_t ssignal(int signum, sighandler_t action); DESCRIPTION
Don't use these functions under Linux. Due to a historical mistake, under Linux these functions are aliases for raise() and signal(), respectively. Elsewhere, on SYSV-like systems, these functions implement software signalling, entirely independent of the classical signal and kill func- tions. The function ssignal() defines the action to take when the software signal with number signum is raised using the function gsig- nal(), and returns the previous such action or SIG_DFL. The function gsignal() does the following: if no action (or the action SIG_DFL) was specified for signum, then it does nothing and returns 0. If the action SIG_IGN was specified for signum, then it does nothing and returns 1. Otherwise, it resets the action to SIG_DFL and calls the action function with parameter signum, and returns the value returned by that function. The range of possible values signum varies (often 1-15 or 1-17). CONFORMING TO
SVID2, XPG2. These functions are available under AIX, DG-UX, HPUX, SCO, Solaris, Tru64. They are called obsolete under most of these sys- tems, and are broken under Linux libc and glibc. Some systems also have gsignal_r() and ssignal_r(). SEE ALSO
kill(2), signal(2), raise(3) notGNU 2002-08-25 GSIGNAL(3)

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