Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Ross S. W. Walker wrote: > There is a known bug in the current implementation of MD raid, > specifically for raid-1 based arrays. The current MD code fails to > preserve the BIO_RW_BARRIER flag on cloned bios. > > What this translates to in DRBD is severe performance penalties and > possible meta-data integrity issues for meta-data stored on MD raid-1 > volumes. > > Please use an alternate location for your meta-data then an MD RAID-1. I > recommend hardware raid, or LVM-mirror, or standalone disk. > > -Ross > > Do you think this would result in the lockups I'm seeing? I haven't noticed any performance issues. Resyncs proceed at about 12MB/s which is about all you can get out of gigabit (not) networking. Are there any patches for the md flag issue? I can move the metadata if necessary but a patch to fix the problem would be ok too. I'll probably just move it to the root disk. Although, now that I'm looking root directory is on a RAID-1 array also. In fact, the whole machine is RAID-1 arrays including /boot! Now what do I do? Gerry