Re: wait-option for assembly during boot process ?

On Sunday February 23, norman.schmidt@ratnet.stw.uni-erlangen.de wrote:

But if the last shutdown left the md devices dirty, they are resynced 
during the next bootup while already in use. For normal ext2/ext3 data 
partitions, this is no problem, but for swap and possibly ext-3 journals 
this is deadly.

Why do you think that resync is 'deadly' for 'swap and possibly ext-3
journals' ?

There were problems like this in 2.2, but they are long gone, unless
there is something else you are thinking of..

What I would like to have is an option in mdadm.conf (through which the 
arrays are configured and started automatically) like "WAIT" which holds 
up the boot process (i.e. usage of the not yet resynced devices) as long 
as resync takes. And these devices should be resynced first, so that one 
does not have to wait for the resync of a terabyte-big data array that 
uses part of the same disks.

There could be some value in atleast waiting until resync starts so
that the order of arrays will match the order of resync.

How can I determine the order of assembly anyway? From top to bottom in 
the config file (at least for arrays that don´t share the same
disks)?

Top to bottom.

NeilBrown
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