10-22-2010
If nobody mentioned it or you had not gotten around to it yet, prod hosts should have something like:
- A frequent (hourly?) cron checking, on every dev, space and, where applicable, inode use (the fancier FS make more inodes on demand), that sends email at any > 90% or whatever, so you can intercede before a crash or outage.
- A daily cron job to zip/remove all logs/files for a prior day saves both space, inodes and accidentally damaged or lost files. Since prod support might be looking at the files, you might just nice -19 zip up day-4 (spans long weekends) files starting at early normal work hours (in case it has problems, why lose sleep?). You can zip by file type, application or everything for one day. Of course, sometimes this raises the challenge of how to change logs and other long running files at midnight or at least daily.
- The backup should remove zip files over a certain age that have been backed up, so space use should be constant/ascending, long term.
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WREN(3) Library Functions Manual WREN(3)
NAME
wren, ata - hard disk interface
SYNOPSIS
bind #H[drive] /dev
bind #w[target[.lun]] /dev
/dev/hd0disk
/dev/hd0partition
/dev/sd0disk
/dev/sd0partition
...
DESCRIPTION
The hard disk interfaces (wren, #w, is a SCSI disk; ata, #H, is an IDE or ATA disk) serve a one-level directory giving access to the hard
disk partitions. The parameter to attach defines the numerical SCSI target and logical unit number or the IDE drive number to access.
Both default to zero.
Each partition name is prefixed by hd and the numeric drive identifier. The partition always exists and covers the entire disk. The size
of each partition as reported by stat(2) is the number of bytes in the partition, so the size of is the size of the entire disk.
The partition also always exists; it is the last block on the disk for SCSI, second to last for IDE. If it contains valid partition data,
those partitions will be visible as well. Every time the device is bound, the partitions are updated to reflect any changes in the parti-
tion file.
The format of the partition file is the string
plan9 partitions
on a line, followed by partition specifications, one per line, consisting of a name and textual strings for the block start and limit for
each partition on the disk.
The program prep(8) writes the partition table for the disk; its use is preferred to writing it by hand.
SEE ALSO
prep(8), scsi(3)
SOURCE
/sys/src/9/port/devwren.c
/sys/src/9/pc/devata.c
WREN(3)