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22.5 Vinum Ŀ��

��Ϊ�˽��Щ��⣬Vinum ��һ��Ĳ��Ŀ��ṹ��

��Ŀ��, �� ��(volume). ��һ��UNIX �� ͬ��ԣ��Ȼ��Щ��̫һ��û�д�С��ơ�
�� plexes, ÿһ��ʾ��е�ַ�ռ䡣�ڲ�νṹ�е��ˮƽ�ܹ��ṩ ��๦�ܡ��԰�plex ��һ��еķ�ʽ��֯�� ̣�ÿ��ͬ��ݡ�
��Vinum ��UNIX ��̴洢��,��Ҳ�� ʹ��UNIX ��Ϊ��plex ��ɲ��, ��ʵ��Ⲣ��ɿ�:UNIX ��ֻ��ķ�� ȡ��֮��Vinum ��һ��򵥵�UNIX �� (the drive) �ֽ�ɽ��subdisks��, ��ʹ�� Ϊplex ��顣
Subdisks λ�� Vinum ��, ��ǰ��UNIX ��Vinum ��԰��ܶ��subdisks�� ʼ��һС��洢��ú��Ϣ��⣬�� ڴ洢��ݡ�

��½��ЩĿ��ṩ��Vinum ��Ҫ��Ĺ��ܵķ��

22.5.1 ��Ĵ�СҪ��

��Vinum��У�Plex��԰Ѷ��subdisk �ֲ��е��ϡ� ��, ÿ��Ĵ�С��plex �Ĵ�С��Ӷ��ƾ��Ĵ�С

��Vinum ͨ��һ��϶��plex ��ɾ��Ĺ��ܡ� ÿ��plex ��һ��һ��е��ݵ��һ��԰��һ�� ˸�plex��

��Ȼһ��plex ��һ��ݣ�, ��Ĳ��ֱ��ض�ʧ�ˡ��Ƶ�� û��Ϊplex ��ֶ��һ��subdisk��Ҳ��Ĺ�� Ĺ��ϵ��£��ֻҪ��һ��plex �ܹ�Ϊ ��ȫ��ַ��Χ�ṩ��ݣ��ܹ��

��Vinum ��plex ˮƽ��ִ�д��Ҳִ�зֶΣ�

һ����plex��ʹ�� ÿ��subdisk �ĵ�ַ�ռ䡣
һ�� �ֶε�plex ��ÿ��subdisk �� . Subdisk ��Ǵ�Сһ��ģ�Ϊ�˴�һ��ӵ�plex �� ֿ��subdisk��

��FreeBSD 9.1�ṩ��Vinum �汾��ʵ��plex:

��plex ����ǿ��԰��κ��subdisk�� subdisk Ҳ��в�ͬ�ĳ��ȡ�Plex ��ͨ��Ӷ��subdisk ��õ��չ�� ֶ� plex ��ͬ�� Ҫ�� CPU ʱ�Ӹ��٣� �� CPU �ϵĸ��ز��ǲ��ɲ��ġ� ��һ��棬��ǵĸ��ؿ��ܲ�ƽ�⣬һ��̿��ܸ��غ��أ� ��Ŀ��ܺܿ��С�
�ֶ�(RAID-0) plexes ��ŵ�� Ǽ��˸��ز�ƽ��: ͨ��ѡ��һ��ʴ�С�ķֶ� (��Լ��256 kB), ��ڸ��ɵ��Ͻ��͸�� . ��ַ��ȱ��subdisk ��ܵ��ǳ��ӵı�� : ��Ǳ��ͬ��С, ͨ��µ�subdisk ��չһ��plex �Ƿǳ��ӵ�,��Vinum ��ǰû��ʵ��. Vinum ��һ�� ģ��۲��ߵ��ƣ�һ��ֶε�plex ��subdisk�� ޷��ӵ� plex �ˡ�

�� 22-1 �ܽ�һ��ÿ��plex ��֯ ��ŵ��ȱ��.

�� 22-1. Vinum Plex��֯ͼ

Plex ��	��subdisks	�ɷ��subdisks	�ߴ��ͬ	Ӧ��
��	1	��	��	��кܴ��Ժ��ܵĴ��洢��
�ֶ�	2	��	��	��ʱ,��нϸ��ܡ�

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