When you don't want RAID-5
Here's a paradox that we only realized recently: in some situations,using RAID-5 can be less reliable overall than using no RAID at all.
This comes about because while RAID-5 preserves your data over asingle-drive failure, it loses all your data if there is ever a doubledrive failure.
Our specific case is a disk-based incremental backup system. Right now aday's backups take up about a third of a disk, and we have it set up soeach day
都喜歡聽蔡寶
嘉賓:蔡寶瓊
忙到沒有時間update,書當然也沒有看完。雅斯培的《大學的理念》裡面堅定的大學價值追求,現在看來像是天方夜譚,耳際不斷想起「out左!不實際!」的諷嘲——可是,若100年不到的理念就已經
明報世紀版隔週二:自尋短見
年輕三種
所謂年輕的末梢,意思是全間卡拉ok裡最老
Features that I wish ZFS had
This is not counting features that Sun has already said they are goingto put in someday, like the ability to remove vdevs from a ZFS pool.The motivation for many of these wishes is good long term storagemanagement , something that ZFS iscurrently weak at.
- the ability to migrate a filesystem from storage pool to storagepool (on the same system) without user-visible downtime or lockups.In theory this ought to be doable, since ZFS is abstracting everythinganyways.
- the ability to control and change what vdevs
Where to find specifications on HTTP POST behavior
Some IP addresses (probably not friendly ones) have recently taken tomaking POST submissions to various 'write comments' URLs here witha Content-Type of 'application/x-www-form-urlencoded; charset=UTF-8'.These get rejected by DWiki , because I was quite paranoid when I wrotethe POST handling code and so DWiki is quite conservative on what itwill accept.
While I was pretty certain that I wasn't losing anything by rejectingthese requests, I did get curious to
Why syndication feed readers ignore an entry's 'last updated' time
The simplistic reason is that only Atom feeds have a distinction betweenthe date an entry was published and the date it was most recentlyupdated. But as far as I know, even fairly deeply Atom aware syndicationfeed readers don't try to do anything much with the field; insteadthey look for changes in the entry's text.
One reason to not use it for much is that the Atom specification is fuzzy about when it getsupdated. The specification says that it is only the time of thelast significant
初戀
「究竟我為甚麼要做
I wish mailers had a real programming language
I really wish that the authors of mail transport agents would give mean actual language to program the behavior of their mailers. Well, notthe low-level behavior; what I want is a high-level language I canuse to cleanly write out the logic of what should happen to messages,the sequence of checks and actions and destinations that a particularmessage should go through.
I feel that our message flow logic is not particularly complicated, when written out directly . The problem is that as far as I can