Re: Re: NFS reexport status

Brent A Nelson <brent@xxxxxxxxxxxx> · Fri, 3 Aug 2007 15:33:25 -0400 (EDT)

I do have a workaround which can hide this bug, thanks to the wonderful 
flexibility of GlusterFS and the fact that it in itself is POSIX.  If I mount 
the GlusterFS as usual, but then use another glusterfs/glusterfsd pair to 
export and mount it and NFS reexport THAT, the problem does not appear.

Presumably, server-side AFR instead of client-side would also bypass the issue 
(not tested)...

Thanks,

Brent

On Fri, 3 Aug 2007, Brent A Nelson wrote:

I turned off self-heal on all the AFR volumes, remounted and reexported (I 
didn't delete the data; let me know if that is needed).

du -sk /tmp/blah/* (via NFS)
du: cannot access `/tmp/blah/usr0/include/c++/4.1.2/\a': No such file or 
directory
171832  /tmp/blah/usr0
109476  /tmp/blah/usr0-copy
du: cannot access `/tmp/blah/usr1/include/sys/\337O\004': No such file or 
directory
du: cannot access 
`/tmp/blah/usr1/src/linux-headers-2.6.20-16/include/asm-ia64/\v': No such 
file or directory
du: cannot access 
`/tmp/blah/usr1/src/linux-headers-2.6.20-16/include/asm-ia64/&\324\004': No 
such file or directory
du: cannot access `/tmp/blah/usr1/src/linux-headers-2.6.20-16/drivers/\006': 
No such file or directory
117472  /tmp/blah/usr1
58392   /tmp/blah/usr1-copy

It appears that self-heal isn't the culprit.

Thanks,

Brent

On Fri, 3 Aug 2007, Krishna Srinivas wrote:

Hi Brent,

Can you turn self-heal off (option self-heal off) and see how it
behaves?

Thanks
Krishna

On 8/3/07, Brent A Nelson <brent@xxxxxxxxxxxx> wrote:
A hopefully relevant strace snippet:

open("share/perl/5.8.8/unicore/lib/jt",
O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
fstat64(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
mmap2(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb7c63000
getdents64(3, /* 6 entries */, 1048576) = 144
lstat64("share/perl/5.8.8/unicore/lib/jt/C.pl", {st_mode=S_IFREG|0644,
st_size=220, ...}) = 0
lstat64("share/perl/5.8.8/unicore/lib/jt/U.pl", {st_mode=S_IFREG|0644,
st_size=251, ...}) = 0
lstat64("share/perl/5.8.8/unicore/lib/jt/D.pl", {st_mode=S_IFREG|0644,
st_size=438, ...}) = 0
lstat64("share/perl/5.8.8/unicore/lib/jt/R.pl", {st_mode=S_IFREG|0644,
st_size=426, ...}) = 0
getdents64(3, /* 0 entries */, 1048576) = 0
munmap(0xb7c63000, 1052672)             = 0
close(3)                                = 0
open("share/perl/5.8.8/unicore/lib/gc_sc",
O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
fstat64(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
mmap2(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xb7c63000
getdents64(3, 0xb7c63024, 1048576)      = -1 EIO (Input/output error)
write(2, "rsync: readdir(\"/tmp/blah/usr0/s"..., 91rsync:
readdir("/tmp/blah/usr0/share/perl/5.8.8/unicore/lib/gc_sc"): Input/output
error (5)) = 91
write(2, "\n", 1
)                       = 1
munmap(0xb7c63000, 1052672)             = 0
close(3)                                = 0

Thanks,

Brent

On Thu, 2 Aug 2007, Brent A Nelson wrote:

NFS reexport of a unified GlusterFS seems to be working fine as of TLA 
409.
I can make identical copies of a /usr area local-to-glusterfs and
glusterfs-to-glusterfs, hardlinks and all.  Awesome!

However, this is not true when AFR is added to the mix (rsync
glusterfs-to-glusterfs via NFS reexport):

rsync: readdir("/tmp/blah/usr0/lib/perl/5.8.8/auto/POSIX"): Input/output
error (5)
rsync: readdir("/tmp/blah/usr0/share/perl/5.8.8"): Input/output error (5)
rsync: readdir("/tmp/blah/usr0/share/i18n/locales"): Input/output error 
(5)
rsync: readdir("/tmp/blah/usr0/share/locale-langpack/en_GB/LC_MESSAGES"):
Input/output error (5)
rsync: readdir("/tmp/blah/usr0/share/groff/1.18.1/font/devps"): 
Input/output
error (5)
rsync: readdir("/tmp/blah/usr0/share/man/man1"): Input/output error (5)
rsync: readdir("/tmp/blah/usr0/share/man/man8"): Input/output error (5)
rsync: readdir("/tmp/blah/usr0/share/man/man7"): Input/output error (5)
rsync: readdir("/tmp/blah/usr0/share/X11/xkb/symbols"): Input/output error
(5)
rsync: readdir("/tmp/blah/usr0/share/zoneinfo/right/Africa"): Input/output
error (5)
rsync: readdir("/tmp/blah/usr0/share/zoneinfo/right/Asia"): Input/output
error (5)
rsync: readdir("/tmp/blah/usr0/share/zoneinfo/right/America"): 
Input/output
error (5)
rsync: readdir("/tmp/blah/usr0/share/zoneinfo/Asia"): Input/output error 
(5)
rsync: readdir("/tmp/blah/usr0/share/doc"): Input/output error (5)
rsync: readdir("/tmp/blah/usr0/share/consolefonts"): Input/output error 
(5)
rsync: readdir("/tmp/blah/usr0/bin"): Input/output error (5)
rsync:
readdir("/tmp/blah/usr0/src/linux-headers-2.6.20-16/include/asm-sparc64"):
Input/output error (5)
rsync: 
readdir("/tmp/blah/usr0/src/linux-headers-2.6.20-16/include/linux"):
Input/output error (5)
rsync:
readdir("/tmp/blah/usr0/src/linux-headers-2.6.20-16/include/asm-mips"):
Input/output error (5)
rsync:
readdir("/tmp/blah/usr0/src/linux-headers-2.6.20-16/include/asm-parisc"):
Input/output error (5)
file has vanished:
"/tmp/blah/usr0/src/linux-headers-2.6.20-16/include/asm-sparc/\#012"
rsync:
readdir("/tmp/blah/usr0/src/linux-headers-2.6.20-16-server/include/config"):
Input/output error (5)
rsync:
readdir("/tmp/blah/usr0/src/linux-headers-2.6.20-16-server/include/linux"):
Input/output error (5)
...

Any ideas? Meanwhile, I'll try to track it down in strace (the output will 
be
huge, but maybe I'll get lucky)...

Thanks,

Brent

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