《 芬蘭的100個社會創新 》，Ilkka Taipale主編、洪蘭譯，台北﹕天下雜誌，2009 100 其實是個約數，書中總共有111篇文章。裡面的確有不少都是芬蘭自創的東西，但也有些東西其實並非芬蘭所創，只是芬蘭人認為他們辦得
Fixing your system after hitting the RAID growth gotcha
The easiest way to dig yourself out of the hole created by the RAIDgrowth gotcha is probably to use a live/rescue CD.But let us suppose that you don't have one handy, which was the casefor me yesterday. Further let us suppose that you have /boot as a separate filesystem , not as part of the rootfilesystem (if this is not the case, you absolutely need a rescue CD;sorry).
The basic goal is to rebuild a version of your current initrd that has
Booting a Linux system without a root mirror
Suppose that you have a system with a mirrored root filesystem and,for some reason , you need to boot it withoutthe mirror being available. At one level, this is very easy; all youneed to do is to find the partition of one of the mirrors and specifyit as the filesystem root device on the kernel command line with' root=/dev/sdXX '.
This works because while software RAID embeds its own metadata in thepartitions, it puts the metadata at the end of the partition,
逞強
常常拒絕逞強，有些時候，更喜歡示弱。
例如，遇到自以為什麼都知道的“消息靈通人士”或“理論家”，無論對方說什麼，不必爭辯，任由對方發揮，只做聽眾，還不忘頻頻點頭。對方說得對固然於你有益，如果那人分明在胡
例如，遇到自以為什麼都知道的“消息靈通人士”或“理論家”，無論對方說什麼，不必爭辯，任由對方發揮，只做聽眾，還不忘頻頻點頭。對方說得對固然於你有益，如果那人分明在胡
A serious gotcha with growing software RAID devices
Suppose that you have a fully mirrored system and you want to expandyour available space by migrating to a pair of larger hard drives. Theobvious way to do this is fairly straightforward, assuming that youcan connect all of your drives at once: partition the new drives (withlarger partitions for at least some of your software RAID devices), addthe new partitions to the appropriate MD device, let things resync, andthen detach the old disks (and eventually physically remove them).
(Hopefully the obvious way
100 social innovations from Finland
《 芬蘭的100個社會創新 》，Ilkka Taipale主編、洪蘭譯，台北﹕天下雜誌，2009 100 其實是個約數，書中總共有111篇文章。裡面的確有不少都是芬蘭自創的東西，但也有些東西其實並非芬蘭所創，只是芬蘭人認為他們辦得
Contagion
How often, when you visited the hospital over the past two weeks, were you asked to take temperature and wear mask? The answer, of course, is often, when everyone seems to be on high alert for human swine flu. If you still aren't convinced about the panic, go and read the posters put up in the hospital elevators: they are now teaching us the recipe - if there is one - which is called cough etiquette.
Regardless of the controversy over the need to quarantine people, most
Regardless of the controversy over the need to quarantine people, most
What affects how fast you can restore backups
I was asked today if I thought that a disk-based backup system could do restores faster than a tape-based system. Mybest answer was a 'maybe', because it really depends on what thelimiting factor is in your restores. Let's look at all of the thingsthat have to happen in a restore:
- you find and load the tape into the tape drive or tape library,if it's not already there.
- if you have a tape library, it loads the tape into the
Another advantage of disk-based backup systems
One of the slightly subtle advantages of disk-based backup systems over tape-based backup systems is thatcapacity expansion is much easier; all you have to do is start usingbigger disks. Since SATA is SATA, you don't need to replace yourenclosure, and it is relatively easy to have multiple generations ofdisks with different capacities cycling through your system.
Contrast this with tape backups. To upgrade to higher capacity tapes,you have to not just buy the tapes, you generally have to buy an entire