Re: Recovery speed at 1MB/s/device, unable to change

[Anssi Hannula <anssi.hannula@gmail.com>]

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(resend, prev post missed the list)

Neil Brown wrote:
> On Monday April 24, anssi.hannula@gmail.com wrote:
> 
>># mdadm --grow /dev/md_d1 --raid-devices=3 --backup-file backupfile
>>mdadm: Need to backup 128K of critical section..
>>mdadm: /dev/md_d1: Cannot get array details from sysfs
>>
>>Strace shows that it's trying to access
>>"/sys/block/md_d4/md/component_size".
>>
>>Why is this?
> 
> 
> Because I didn't test my code properly :-(
> 
> Following patch should fix it.
> 

It appears you missed another occurrence (patch attached).

However, it got stuck after
mdadm: Need to backup 128K of critical section..

I did ctrl-c, and according to /proc/mdstat it was successfully
reshaped, nor can I restart the reshape.

But "umount /mnt/test" (/mnt/test is where /dev/md_d1p1 is mounted)
blocks, and this time it becomes unkillable.

/proc/mdstat reports:
md_d1 : active raid5 loop1[1] loop0[0]
      4992 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]


-- 
Anssi Hannula



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--- sysfs.c.old	2006-04-24 01:24:09.000000000 +0300
+++ sysfs.c	2006-04-24 01:33:48.000000000 +0300
@@ -69,7 +69,7 @@
 			sprintf(sra->name, "md%d", minor(stb.st_rdev));
 		else
 			sprintf(sra->name, "md_d%d",
-				minor(stb.st_rdev)/16);
+				minor(stb.st_rdev)/64);
 	} else {
 		if (devnum >= 0)
 			sprintf(sra->name, "md%d", devnum);