A file system can only be extended to a size within the limits of the region size (blocks). The default region size of 8192 blocks supports a max file system size of 3.984375 TB (4177920 MB).
The following table provides max file system sizes for several combinations of Region Size in blocks and SMBitmap size in bytes. The SMBitmap size is set to 131072 bytes and should never be changed.
|
Region Size (blocks) |
Region Size (MB) |
SMBitmap Size (bytes) |
Max File System Size (MB) |
Max File System Size (TB) |
|---|---|---|---|---|
|
8192 |
4 |
131072 |
4177920 |
3.984375 |
|
16384 |
8 |
131072 |
8355840 |
7.96875 |
|
32768 |
16 |
131072 |
16711680 |
15.9375 |
|
65536 |
32 |
131072 |
33423360 |
31.875 |
If a protected file system needs to be extended, verify the following.
-
The RegionSize will not be exceeded.
The RegionSize for a protected LV can be checked using the command
/usr/scrt/bin/rtattr -C 1 -o smf_<LV> -a RegionSizeThe unit of the region size is the number of blocks. Each block is 512 bytes. If the RegionSize will be exceeded, refer to Extending a protected file system beyond the limit of the region (block) size.
-
The protected LV "MAX LPs:" will not be exceeded.
-
The replica LV ("pt" LV) "MAX LPs:" will not be exceeded.
-
There is enough free space in the protected and replica VGs.
Assure MIMIX for AIX-protected file systems can be extended when Assure MIMIX for AIX is active using the smit chfs command. When the file system is extended:
-
On the production server, the replica ("pt" LV) is automatically extended when data is written to the expanded area.
-
On the recovery server, the write journal associated with the file system is not extended.