There are some incompatibilities with the following functions compared to 4.1A20:
Number | Item |
|---|---|
1 | Changes operation of truncate(2), ftruncate(2), creat(2), and open(2) specified with O_TRUNC from the other node to the file where mmap(2) is being executed |
2 | Changes port numbers reserved by GFS |
3 | Changes the type of a special file specified for the GFS command argument |
4 | Change in error message of sfcdf(8) |
5 | Change in error message of sfcfsck(8) |
6 | Check strengthening of parameter specified for -o specific_options option of sfcmkfs(8) |
7 | Changes allocated reserved area size by writing operations |
8 | Add the upper limit of concurrently open files |
9 | Addition of the i-node's cache memory release function at the time of accessing many files |
10 | Omitted value of the communication timeout between nodes |
11 | Deletion of the sfcfrmd information message |
12 | Change in operation at the time of specifying the mount option atime |
13 | Cannot create sockets |
14 | Cannot create named pipes |
GFS : Global File Services
Incompatibility description
When the following system calls are issued on another node for a file within mmap(2) on the GFS Shared File System, action of them is changed.
truncate(2)
ftruncate(2)
creat(2)
open(2) specified with O_TRUNC
Before change: Normal exit
After change: Abnormal exit (return code: -1, errno: EBUSY)
Corrective action
None.
Incompatibility description
Port numbers reserved by GFS in the /etc/services file have been changed.
Before change: 9200 - 9300
After change: 9200 - 9263, 9300
Corrective action
No corrective action is required.
Incompatibility description
The type of special files has been changed in the following commands:
sfcdf(8)
sfcfsck(8)
sfcmkfs(8)
sfcadm(8)
sfcgetconf(8)
sfcnode(8)
sfcsetup(8)
Before change: Specify a character special file
After change: Specify a block special file. A character special file cannot be specified.
Corrective action
If a special file is specified for the argument of the above command, specify a block special file. If a character special file is specified, the commands will output error messages and abnormal exit.
Incompatibility description
In the sfcdf(8) command, the error message output at the following conditions has been changed.
1) -m option is specified. And,
2-1) A special file name which does not exist is specified for the argument. Or,
2-2) A special file name other than the GFS Shared File System is specified for the argument.
Before change:
For 2-1)
sfcdf: ERROR: cannot open special: errmsg
For 2-2)
sfcdf: ERROR: invalid device: special
After change:
sfcdf: ERROR: special is not a sfcfs file system
Corrective action
None.
Incompatibility description
In the sfcfsck(8) command, the error message output at the following conditions has been changed.
A special file name other than the GFS Shared File System is specified for the argument.
Before change:
device-name is not for sfcfs
After change:
Can't check device-name
Corrective action
None.
Incompatibility description
The operation of sfcmkfs(8) for the following conditions was changed.
1) Any of the following -o specific_options options is specified.
free=n
logsz=n
maxnode=n
metasz=n
mfree=n
nbpi=n
nblkpext=n
2) The first character of n is a digit. And,
3) When characters other than the figure are included since the second character of n.
Before change:
The string only of a digit consecutive from the first character in n is recognized as a parameter.
Example) "-o free=9a0" is considered to be "-o free=9".
After change:
The following error messages are output, and it terminates abnormally.
sfcmkfs:ERROR: Illegal option : value
Corrective action
Please specify the string only of the digit for the parameter.
Incompatibility description
When executing write processing for a file on the GFS Shared File System, reserve area size by a node basis was increased. Within this change, used data area that is obtained by df(1), sfcdf(8), or statfs(2) is increased, after executing write processing.
As the example, an output result of df(1) is shown below in case an 1 kilobyte file is created on a GFS Shared File System just after making.
Before change:
Filesystem 1K-blocks Used Available Use% Mounted on /dev/sfdsk/c1/dsk/vol1 56569128 5200 50907016 1% /mnt/gfs1 |
After change:
Filesystem 1K-blocks Used Available Use% Mounted on /dev/sfdsk/c1/dsk/vol1 56569128 20480 50891736 1% /mnt/gfs1 |
Reserve area is increased because it is interpreted as used date area (column of "Used"), and available data area (column of "Available") is decreased.
Corrective action
None.
Incompatibility description
When 5000 different files are being concurrently opened on a GFS Shared File System, it was changed that operation of open(2) or creat(2)'s execution for 5001th file.
Before change: Normal exit
After change: Abnormal exit (return code: -1, errno: ENFILE)
Corrective action
Please check the following message in /var/log/messages.
kernel: VFS: file-max limit number reached |
If this message is not output, 5000 different files are already being opened on the GFS Shared File System where the file tried to open exists.
Please execute close(2) to files that are being opened and can be closed (have already been transacted).
If you need to open 5000 and over files on the GFS Shared File System, please disperse the target files to multiple GFS Shared File Systems.
Incompatibility description
When the amount of i-node's cache memory used by MDS exceeded 30000, processing that decreases the amount of i-node's cache memory from 30000 to 22000 was added.
Before change:
The function of releasing i-node's cache memory used by MDS doesn't work.
After change:
When the amount of i-node's cache memory used by MDS exceeds 30000, the following message is output and release processing of i-node's cache memory will be started.
NOTICE: sfcfs_mds:3020: mountpoint: The total number of vnodes used reached the upper bound. vnodes used=totalnum: upper bound=30000: lower bound=22000 |
When the i-node's cache memory used by MDS has been released until 22000, release processing will stop with the following indication.
NOTICE: sfcfs_mds:3021: mountpoint: The total number of vnodes used(=totalnum) is the lower bound(=22000). |
Corrective action
None.
But the i-node's cache memory release is in progress in the period of between the two message indications, "NOTICE : sfcfs_mds:3020" and "NOTICE : sfcfs_mds:3021". During release processing, file accessibility on the file system will be affected. Please minimize file access.
Incompatible contents
In the monitoring of the node by communication, the default of timeout value is changed after a communicative response is lost until it estimates a partner node to be an abnormal state.
Before change: 60 seconds
After change: 180 seconds
Corrective action
No corrective action is required
Information
You do not have to change the communication timeout between nodes. The value can be changed.
See
Please refer to "14.1.2 Communication timeout value", "10.1.2 Change (in file system attributes)" and "11.1.2 Change (in file system attributes)" about the change method of the communication timeout value between nodes.
Incompatibility description
The information message output at the time of starting sfcfrmd is deleted.
Before change: The following messages are output.
sfcfrmd[pid]: INFO: sfcfrmd:0001: set number of threads 16 sfcfrmd[pid]: INFO: sfcfrmd:0002: set service port number 9300 sfcfrmd[pid]: INFO: sfcfrmd:0003: set connection timeout value 30 [sec] |
After change: The above message is not output.
Corrective action
No corrective action is required.
Incompatibility description
Operation at the time of specifying the mount option atime has been changed.
Before change:
The last access time of a file is updated for each file access.
After change:
The last access time of a file is updated when the previous last access time is the same as or older than the last modify time or the last change time. Also, when the previous last access time of a file is old for over a day, it is updated.
Corrective action
To execute the operation performed before change, change the mount option which is described in /etc/fstab from atime to strictatime.
Incompatibility description
Operation when creating sockets on the GFS Shared File System by specifying S_IFSOCK in the second argument of mknod(2) has been changed.
Before change: Normal exit
After change: Abnormal exit (return code: -1, errno: EPERM)
Corrective action
None.
Incompatibility description
Operation when creating named pipes on the GFS Shared File System by specifying S_IFIFO in the second argument of mknod(2) has been changed.
Before change: Normal exit
After change: Abnormal exit (return code: -1, errno: EPERM)
Corrective action
None.
