Re: The subarray is loaded container by load_container

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On 07/07/2016 06:16 PM, Artur Paszkiewicz wrote:
On 07/07/2016 11:13 AM, Xiao Ni wrote:
Hi all

We encountered one problem at booting time:

Run MD devices:  mdadm: array /dev/md/OSVOLUME0 now has 2 devices (0 new) [FAILED]

mdadm -IRs returns 1 at the booting time. In fact the array is already running. The
command mdadm -IRs shouldn't return 1 if all the arrays are running, right?

In IncrementalScan function, it scans all the raid in /run/mdadm/map. It contains the
subarray too. The return value is 1 from function load_container. So the return value
of IncrementalScan rv is set to 1. If all arrays are running already, I think mdadm -IRs
should return 0, not 1.

Should we checks earlier whether it's a container or not before calling load_container?

Best Regards
Xiao

Hi Xiao,

I think you're right that mdadm -IRs should return 0 in this case.
IncrementalScan should not try loading a container from a member array,
because that will always fail. Can you check if this fixes the problem
for you?

diff --git a/Incremental.c b/Incremental.c
index ba97b00..cc01d41 100644
--- a/Incremental.c
+++ b/Incremental.c
@@ -1347,8 +1347,12 @@ restart:
if (devnm && strcmp(devnm, me->devnm) != 0)
                         continue;
-               if (devnm && me->metadata[0] == '/') {
+               if (me->metadata[0] == '/') {
                         char *sl;
+
+                       if (!devnm)
+                               continue;
+
                         /* member array, need to work on container */
                         strncpy(container, me->metadata+1, 32);
                         container[31] = 0;

Thanks,
Artur

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Hi Artur

Sorry for late response. I have been waiting the result from customer and the customer haven't give me the answer. I tested this in my environment and this patch can fix this problem.

Best Regards
Xiao

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