01-16-2012
Thanks for sharing your story. It's very true that most of the times we do not bother to check the time of the clock before scheduling stuffs.
We maintain IT infrastructure for a big pharma company. For any SLA (service level agreement) breach, my employer has to pay a real big amount of money to the client. Now that's been told, once my colleague had to schedule a maintenance on an AIX server. We have a procedure to do that. There's a lot of approvals from service delivery managers of both the client and our company required. After getting those, this guy went on scheduling the reboot of the machine in maintenance mode in cron a day before. The next day, I got a call from IT Incident management people saying a server is down before it's scheduled maintenance window. It happened around 20 minutes before the scheduled time. We had to raise a severity for this. Upon checking the root cause of this later, we found somehow the server was failing to sync with the NTP server and the clock was going 20 minutes faster than the actual time.
And yes, because of all these, we breached the SLA!
This User Gave Thanks to admin_xor For This Post:
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MKFS(8) System Manager's Manual MKFS(8)
NAME
mkfs - construct a file system
SYNOPSIS
/sbin/mkfs [ -i bytes ] [ -s size ] [ -m gap ] [ -n modulus ] special
DESCRIPTION
N.B.: file systems are normally created with the newfs(8) command.
Mkfs constructs a file system by writing on the special file special. The size of the filesystem in logical blocks is specified by the -s
size option. Logical blocks are 1K (2 sectors) under 2.11BSD.
NOTE: The newfs(8) program's -s option is in units of sectors. Newfs(8) converts this to filesystem (logical) blocks for mkfs(8).
The number of inodes is calculated based on the argument bytes to the -i option. The default is 4096. If more inodes are desired in a
filesystem (there is an absolute maximum of 65500) then a lower value for bytes should be used, perhaps 3072 or even 2048.
The flags -m gap and -n modulus determine the block interleaving of the freelist that will be constructed, where gap is the distance
between successive 1024-byte blocks, and modulus is the number of blocks before the pattern repeats, typically one cylinder. The optimal
values for these parameters vary with the speed and geometry of the disk, as well as the speed of the processor. Newfs(8) will calculate
the correct values in almost all cases from the disklabel.
SEE ALSO
fs(5), dir(5), disklabel(8), fsck(8), mkproto(8) newfs(8)
BUGS
The lost+found directory is created but the boot block is left uninitialized (see disklabel(8).)
3rd Berkeley Distribution November 16, 1996 MKFS(8)