Kernel Log: Coming in 3.1 (Part 2) – Storage and filesystems

“The software RAID code now supports bad block management and
dm-crypt can notify SSDs about freed storage areas. The iSCSI
target framework LIO has been updated to Version 4.1 and the
default Ext3 settings make the filesystem more robust, but a bit
slower.

In Linux 3.1, the Ext4 filesystem will, for the first time,
remember which unused blocks it has already reported to underlying
storage media when requested to do so by Fstrim. On subsequent
calls to Fstrim, it then only needs to report blocks which have
been freed up in the interim, thus speeding up batched discard,
which is useful for SSDs and thinly provisioned storage.

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