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io: increase the default io memory from 4 to 8 MiB

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This is the default bcache size that is created at the
start of the command.  It needs to be large enough to
hold a single copy of metadata for a given VG, or the
VG cannot be read or written (since the entire VG would
not fit into available memory.)

Increasing the default reduces the chances of anyone
needing to increase the default to use their VG.

The size can be set in lvm.conf global/io_memory_size;
the lower limit is 4 MiB and the upper limit is 128 MiB.
This commit is contained in:
David Teigland 2019-03-04 11:18:34 -06:00
parent 3584e0c0d5
commit 7edbf8a441
2 changed files with 2 additions and 2 deletions
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2
lib/config/defaults.h
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@ -314,6 +314,6 @@
#define DEFAULT_HINTS "all"
#define DEFAULT_IO_MEMORY_SIZE_KB 4096
#define DEFAULT_IO_MEMORY_SIZE_KB 8192
#endif /* _LVM_DEFAULTS_H */

2
lib/label/label.c
View File

@ -794,7 +794,7 @@ out:
* the metadata size.)
*/
#define MIN_BCACHE_BLOCKS 32 /* 4MB, currently matches DEFAULT_IO_MEMORY_SIZE_KB */
#define MIN_BCACHE_BLOCKS 32 /* 4MB */
#define MAX_BCACHE_BLOCKS 1024
static int _setup_bcache(int num_devs)