NFS with a NAS: permanently inconsistent directory state across clients
Hi,
I am having some NFS directory consistency problems with the below setup on a local (192.) network:
1. Different permissions (chmod) for the same NFS dir are reflected on different clients.
2. (more serious) an NFS dir created on client1 cannot be accessed on client2; this applies to some directories, not others; when this problem applies to a directory, it is a consistent problem.
Setup:
NFS server: Thecus N8800, 16Tb raw, RAID6
Client1: Sun Fire V210, Solaris 5.10 Generic_139555-08
Client2: Sun Fire V100, Solaris 5.10 Generic_118822-23
Both clients nfs-mount. Flags: vers=3,proto=tcp,sec=sys,hard,intr,link,symlink,acl,rsize=32768,wsize=32768,retrans=5,timeo=600
Attr cache: acregmin=3,acregmax=60,acdirmin=30,acdirmax=60
Use case on Client1:
CD to an nfs subdir:
All good. CD to somedir1 works; can LS and see files. Same for somedir2. Note: somedir2 was mkdir'ed on Client1.
Use case On Client2:
CD to the same nfs subdir. Listing files works, but the permissions are different than what is listed on Client1: PROBLEM1: the group permission for the same dir is different on client1 vs. client2.
CD to somedir1 works; can LS and see files. PROBLEM2: *cannot* CD to somedir2:
On both clients, 'group' is defined in /etc/groups with the same id; 'user' is defined in /etc/passwd with the same id.
When I un-mount and re-mount the nfs dir on client2, I am able to access the directory in question (subdir2). Permissions, however, are still different across clients.
Does anyone have suggestions as to what is going wrong with my NFS setup? I'll be happy to post more information.
NFS server is a Thecus N8800 Network Attached Storage. It runs Linux and is configurable via a web interface. Unfortunately, I don't see much useful info via the web UI on NFS status. I also have not tried rooting the box.
"nfsstat -m" on the client is in my original post.
Umm, no you didn't provide nfsstat data in your original post:
Quote:
Originally Posted by cosmojetz
Hi,
I am having some NFS directory consistency problems with the below setup on a local (192.) network:
1. Different permissions (chmod) for the same NFS dir are reflected on different clients.
2. (more serious) an NFS dir created on client1 cannot be accessed on client2; this applies to some directories, not others; when this problem applies to a directory, it is a consistent problem.
Setup:
NFS server: Thecus N8800, 16Tb raw, RAID6
Client1: Sun Fire V210, Solaris 5.10 Generic_139555-08
Client2: Sun Fire V100, Solaris 5.10 Generic_118822-23
Both clients nfs-mount. Flags: vers=3,proto=tcp,sec=sys,hard,intr,link,symlink,acl,rsize=32768,wsize=32768,retrans=5,timeo=600
Attr cache: acregmin=3,acregmax=60,acdirmin=30,acdirmax=60
Use case on Client1:
CD to an nfs subdir:
All good. CD to somedir1 works; can LS and see files. Same for somedir2. Note: somedir2 was mkdir'ed on Client1.
Use case On Client2:
CD to the same nfs subdir. Listing files works, but the permissions are different than what is listed on Client1: PROBLEM1: the group permission for the same dir is different on client1 vs. client2.
CD to somedir1 works; can LS and see files. PROBLEM2: *cannot* CD to somedir2:
On both clients, 'group' is defined in /etc/groups with the same id; 'user' is defined in /etc/passwd with the same id.
When I un-mount and re-mount the nfs dir on client2, I am able to access the directory in question (subdir2). Permissions, however, are still different across clients.
Does anyone have suggestions as to what is going wrong with my NFS setup? I'll be happy to post more information.
Thanks a lot!
What's the inode number of the problem directories and/or files?
I suspect the problem is with the server - Solaris is VERY particular about NFS implementations being EXACTLY according to the NFS spec.
Can a 64-bit process access the files/directories?
Ensure the mount points are directories with 755 permission! (umount to check.)
That too.
I see that nfsstat data and I see non-zero values in NFSv2 stats. Is the server Linux-based? Or Irix-based - nothing like inode numbers greater than 2 gig - the files are invisible to 32-bit applications running on Solaris since an inode number above 2 gig violates the specs for a 32-bit system.
The inode number of the problem file in question is: 1080094
Yes, the NFS server is Linux-based.
Re. ensure mount points are 755: yes, they are; otherwise I wouldn't be able to create any directories/files. Note that the problem occurs only with some newly created directories, but when it does occur, it is consistent (directory can never be read).
Regarding the other problem (perhaps related): even with freshly mounted nfs dirs, the two clients show different group permissions for all files/dirs:
Example of same dir:
Client1:
drwxrwx---+ 58 user group
Client2:
drwx------+ 58 user group
Both user and group are defined with same ids in /etc/passwd, /etc/group. What config might be faulty to warrant this behavior?
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