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Code Editor : pg_checksystem
#!/usr/bin/perl -wT # Check various system parameters for PostgreSQL. This needs to be run as root. # # (C) 2005-2009 Martin Pitt <mpitt@debian.org> # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. use strict; use PgCommon; # Check write cache setting for given drive. # Arguments: <device> # Returns: 0 = disabled, 1 = enabled, -1: could not determine sub get_device_write_cache { open DRV, $_[0] or return -1; sub HDIO_GET_WCACHE () {0x30e;} my $pval = pack 'l', 0; ioctl DRV, &HDIO_GET_WCACHE, $pval or return -1; my ($val) = unpack 'l', $pval; close DRV; return $val; } error 'This command needs to be executed as root' if $> != 0; # collect write cache-enabled drives with databases my %drive_wcache; my %seen; for my $v (get_versions) { for my $c (get_version_clusters $v) { my $datadir = PgCommon::cluster_data_directory $v, $c; my $drv = PgCommon::get_file_device $datadir; $drv =~ s/[0-9]+$//; unless (exists $seen{$drv}) { $drive_wcache{$drv} = 1 if (get_device_write_cache $drv) > 0; $seen{$drv} = 1; } } } my @unsave_drives = keys %drive_wcache; if (@unsave_drives) { print 'Warning: The following devices contain databases and have write caching enabled: ', (join ' ', @unsave_drives), ' This could destroy the integrity of your databases in the event of power failure. Consider disabling the write cache with "hdparm -W 0 <device>". '; }
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