search for: vdev_raidz

...ing like this: Disk 0 1 2 3 -------------------- LBA 0 A. A A A 1 A. A A A 2 A. A A B. 3 B B B B. 4 B B B B. 5 B B C. C etc. Where writing the 4k of B blocks starts at offset 5.5k and finishes at 9k. i.e for B (as seen in vdev_raidz_map_alloc): f = 11 % 4 == column 3 (0 indexed) q = 8 / (3) == 2 r = 8 - (2 * (4-1)) == 2 bc = 2 + 1 == 3 Then the for loop the first 3 columns (starting from column 3 and wrapping) will be marked as big columns (storing an extra block each) and the final column, column 2 will only store 2 blocks......

Yeah:) I''d like to work on this. Here are my first observations: - We need to call vdev_op_asize method with additonal ''offset'' argument, - We need to move data to new disk starting from the very begining, so we can''t reuse scrub/resilver code which does tree-walk through the data. Below you can see how I imagine to extend RAIDZ. Here is the legend:

.../src/uts/common/fs/zfs/sys/spa.h update: usr/src/uts/common/fs/zfs/sys/vdev.h update: usr/src/uts/common/fs/zfs/sys/zio.h update: usr/src/uts/common/fs/zfs/sys/zio_impl.h update: usr/src/uts/common/fs/zfs/vdev.c update: usr/src/uts/common/fs/zfs/vdev_mirror.c update: usr/src/uts/common/fs/zfs/vdev_raidz.c update: usr/src/uts/common/fs/zfs/vdev_root.c update: usr/src/uts/common/fs/zfs/zfs_ioctl.c update: usr/src/uts/common/fs/zfs/zio.c update: usr/src/uts/common/fs/zfs/zio_checksum.c update: usr/src/uts/common/sys/fs/zfs.h

If there were a ?zfs send? datastream saved someplace, is there a way to verify the integrity of that datastream without doing a ?zfs receive? and occupying all that disk space? I am aware that ?zfs send? is not a backup solution, due to vulnerability of even a single bit error, and lack of granularity, and other reasons. However ... There is an attraction to ?zfs send? as an augmentation to the

Apologies for the blank message (if it came through). I have heard here and there that there might be in development a plan to make it such that a raid-z can grow its "raid-z''ness" to accommodate a new disk added to it. Example: I have 4Disks in a raid-z[12] configuration. I am uncomfortably low on space, and would like to add a 5th disk. The idea is to pop in disk 5 and have