Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi, Besides bug-fixes this release brings support for FLUSH/FUA for the layers that get stacked on top of DRBD. Talking of bugs of previous releases: It needs to be pointed out that as the barrier-support was removed in upstream kernel (2.6.36), it was no longer save to run DRBD in protocol A or B with barriers enabled. In case you... * use protocol A or B AND * have a kernel >= 2.6.36 (or 2.6.32 if it is RHEL6/CentOS6 or other clone) AND * have DRBD <= 8.3.13 AND * do not have the option "no-disk-barrier" set. (= barriers enabled) THEN you might get write reordering on secondary, which is bad. Your possible ways out: * Add "no-disk-barrier" to your config OR * Upgrade to drbd-8.3.14 Note: You are only affected if all of the 4 conditions are true. You solved the issue if you take _one_ of the two described ways out. Best, Phil 8.3.14 (api:88/proto:86-97) -------- * No longer support write-ordering "barrier" on kernels newer than 2.6.36 (or RHEL's 2.6.32), since it is no longer supported by the kernel's IO-layer * Fixed the cause of the "ASSERT FAILED tl_hash..." messages * Fixed an OOPS in case a on-congestion policy was set and the node becomes disk less * Fixed a list corruption for read requests that complete with an error after they were aborted * Fixed a kernel panic if the device size was an exact multiple of 128MiB * Finish requests that completed while IO on DRBD was frozen. Before such requests where never completed by DRBD * Fixed a potential memory allocation during deadlock online resize * Online resize with internal meta data failed to write the bitmap to the new on-disk-location after the resize operation. This issue was introduced with 8.3.10 * Do not go through NetworkFailure state during a regular disconnect * Improve the handling of read-errors: Make sure that sectors that had a read error are overwritten with data from the peer on the next resync * Expose the data-generation-uuids through /sys/block/drbdXX/drbd/ * Add a stop-sector to the online verify feature * Support FLUSH/FUA for layers above DRBD * The new flag --peer-max-bio-size for drbdmeta create-md is of use if you plan to use the device for long time without peer http://www.linbit.com/support/drbd-8.3.14/ http://oss.linbit.com/drbd/8.3/drbd-8.3.14.tar.gz http://git.drbd.org/gitweb.cgi?p=drbd-8.3.git;a=tag;h=refs/tags/drbd-8.3.14 best, Phil