Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
>>>>> "Allen" == Allen Chen <achen at harbourfrontcentre.com> writes:
Allen> Here is my explanation to use DRBD instead of md raid1: for
Allen> md raid1, if one member is physically removed from the
Allen> machine, and after you reconnect the same disk to md raid1,
Allen> MD will re-sync everything to it.
Wrong, see below.
Allen> It takes much more time. for DRBD, if the second disk is
Allen> removed from the machine, and after you reconnect the same
Allen> disk to DRBD, DRBD will sync whatever has been changed. It
Allen> take less time than MD raid1.
md raid1 can do the same thing and is definitely the better tool for this
job. See e.g.
https://raid.wiki.kernel.org/index.php/Write-intent_bitmap
Roland
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