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Ned Bass
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Some devices have exhibited sensitivity to the ending alignment of partitions. In particular, even if the first partition begins at 1 MiB, we have seen many sd driver task abort errors with certain SSDs if the first partition doesn't end on a 1 MiB boundary. This occurs when the vdev label is read during pool creation or importation and causes a delay of about 30 seconds per device. It can also be simulated with dd when the pool isn't imported: dd if=/dev/sda1 of=/dev/null bs=262144 count=1 For the record, this problem was observed with SMARTMOD SG9XCA2E200GE01 200GB SSDs. Unfortunately I don't have a good explanation for this behavior. It seems to have something to do with highly fragmented single-sector requests being issued to the device, which it may not support. With end-aligned partitions at least page-sized requests were queued and issued to the driver according to blktrace. In any case, aligning the partition end is a fairly innocuous work-around, wasting at most 1 MiB of space. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #574
Native ZFS for Linux! ZFS is an advanced file system and volume manager which was originally developed for Solaris. It has been successfully ported to FreeBSD and now there is a functional Linux ZFS kernel port too. The port currently includes a fully functional and stable SPA, DMU, and ZVOL with a ZFS Posix Layer (ZPL) on the way!
$ ./configure
$ make pkg
Full documentation for building, configuring, and using ZFS can be found at: http://zfsonlinux.org