Neil Brown wrote:
On Wednesday October 4, mickg@xxxxxxxxx wrote:
I have been trying to run:
mdadm --grow /dev/md0 --raid-devices=6 --backup-file /backup_raid_grow
I get:
mdadm: Need to backup 1280K of critical section..
mdadm: /dev/md0: Cannot get array details from sysfs
It shouldn't do that....
Can you
strace -o /tmp/trace -s 300 mdadm --grow .....
and send a copy of /tmp/trace. I'd like to see how far it gets at
reading information from sysfs.
Would it need to be unmounted to work properly (It is currently mounted
under lvm)?
No. unmounting isn't needed and won't make any difference.
NeilBrown
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strace mdadm --grow /dev/md0 --raid-devices=6 --backup-file /backup_raid_grow
execve("/sbin/mdadm", ["mdadm", "--grow", "/dev/md0", "--raid-devices=6", "--backup-file", "/backup_raid_grow"], [/* 68 vars */]) = 0
brk(0) = 0x8076000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=107351, ...}) = 0
mmap2(NULL, 107351, PROT_READ, MAP_PRIVATE, 3, 0) = 0xa7fa8000
close(3) = 0
open("/lib/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\300Y\1"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1404242, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xa7fa7000
mmap2(NULL, 1176988, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xa7e87000
madvise(0xa7e87000, 1176988, MADV_SEQUENTIAL|0x1) = 0
mmap2(0xa7fa0000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x118) = 0xa7fa0000
mmap2(0xa7fa4000, 9628, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xa7fa4000
close(3) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xa7e86000
set_thread_area({entry_number:-1 -> 6, base_addr:0xa7e866b0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1,
seg_not_present:0, useable:1}) = 0
mprotect(0xa7fa0000, 8192, PROT_READ) = 0
munmap(0xa7fa8000, 107351) = 0
time(NULL) = 1160052126
getpid() = 8461
brk(0) = 0x8076000
brk(0x8097000) = 0x8097000
open("/etc/mdadm.conf", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=154, ...}) = 0
mmap2(NULL, 131072, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xa7e66000
read(3, "DEVICE partitions\nARRAY /dev/md0"..., 131072) = 154
read(3, "", 131072) = 0
read(3, "", 131072) = 0
close(3) = 0
munmap(0xa7e66000, 131072) = 0
open("/dev/md0", O_RDWR) = 3
fstat64(3, {st_mode=S_IFBLK|0640, st_rdev=makedev(9, 0), ...}) = 0
ioctl(3, 0x800c0910, 0xafc4a024) = 0
ioctl(3, 0x80480911, 0xafc4a0a8) = 0
fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 3), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xa7fc2000
write(1, "mdadm: Need to backup 1280K of c"..., 50mdadm: Need to backup 1280K of critical section..
) = 50
fstat64(3, {st_mode=S_IFBLK|0640, st_rdev=makedev(9, 0), ...}) = 0
open("/sys/block/md0/md/component_size", O_RDONLY) = -1 ENOENT (No such file or directory)
write(2, "mdadm: /dev/md0: Cannot get arra"..., 53mdadm: /dev/md0: Cannot get array details from sysfs
) = 53
exit_group(1) = ?
Process 8461 detached
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