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When you first create the mirror relationship, all data from the primary logical drive is copied to the remote logical drive (full synchronization).
During the full synchronization, the primary logical drive remains accessible for all normal
host I/Os. The secondary logical drive can be mapped to a host and read access is possible.
The read/write behavior changes automatically if a role reversal of the logical drive occurs
(this applies in both directions: from secondary to primary and vice versa). Keep in mind,
however, that because of mapping of LUNs to specific IDs, some operating systems, such as Windows with dynamic disks, and VMware do not support mapping of identical drives to the same host without special steps being performed to change these mappings.
Also keep in mind that many operating systems such as Windows and AIX write a signature
or a dirty bit when mounting a volume. In this case no direct read access is possible. The
workaround for these operating systems is to start a FlashCopy of the volume and take a
VolumeCopy on top of it.
这样吧，这论坛里很多18m的fans，那位能解释一下上面这段红皮书里德话？ 最后说了win和aix肯定就挂不起来，存储不让你写。那么暗指linux可以? solaris可以？hpux可以？就算可以，敢挂起来用么？
用户处用的是sybase，我就很不明白，竟然真敢这么用。 |
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楼主: 冬瓜头
发表于 2010-09-07 21:24
发表于 2010-09-08 01:37
