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Diffstat (limited to 'system/bcache-tools/README')
| -rw-r--r-- | system/bcache-tools/README | 27 |
1 files changed, 14 insertions, 13 deletions
diff --git a/system/bcache-tools/README b/system/bcache-tools/README index 7db39a5263..251f258a39 100644 --- a/system/bcache-tools/README +++ b/system/bcache-tools/README @@ -1,20 +1,21 @@ These are the userspace tools required for bcache. -Bcache is a patch for the Linux kernel to use SSDs to cache other block -devices. For more information, see http://bcache.evilpiepirate.org. -Documentation for the run time interface is included in the kernel tree, in -Documentation/bcache.txt. +Bcache is a patch for the Linux kernel to use SSDs +to cache other block devices. For more information, see +http://bcache.evilpiepirate.org. Documentation for the run time +interface is included in the kernel tree, in Documentation/bcache.txt. Included: make-bcache -Formats a block device for use with bcache. A device can be formatted for use -as a cache or as a backing device (requires yet to be implemented kernel -support). The most important option is for specifying the bucket size. -Allocation is done in terms of buckets, and cache hits are counted per bucket; -thus a smaller bucket size will give better cache utilization, but poorer write -performance. The bucket size is intended to be equal to the size of your SSD's -erase blocks, which seems to be 128k-512k for most SSDs; feel free to +Formats a block device for use with bcache. A device can be +formatted for use as a cache or as a backing device (requires yet +to be implemented kernel support). The most important option is for +specifying the bucket size. Allocation is done in terms of buckets, +and cache hits are counted per bucket; thus a smaller bucket size +will give better cache utilization, but poorer write performance. The +bucket size is intended to be equal to the size of your SSD's erase +blocks, which seems to be 128k-512k for most SSDs; feel free to experiment. bcache-super-show @@ -22,9 +23,9 @@ Prints the bcache superblock of a cache device or a backing device. Udev rules The first half of the rules do auto-assembly and add uuid symlinks -to cache and backing devices. If util-linux's libblkid is +to cache and backing devices. If util-linux's libblkid is sufficiently recent (2.24) the rules will take advantage of -the fact that bcache has already been detected. Otherwise +the fact that bcache has already been detected. Otherwise they call a small probe-bcache program that imitates blkid. The second half of the rules add symlinks to cached devices, |