[DRBD-user] DRBD w/RAID5 - Ubuntu Server

Todd Denniston Todd.Denniston at ssa.crane.navy.mil
Tue Aug 12 15:54:44 CEST 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Stefan Seifert wrote, On 12/23/-28158 02:59 PM:
> Also: never put a drbd meta disk on a MD RAID 5. Its painfully slow (and may 
> be a reason for what you see). RAID 1 should be ok.

Can you clarify, please?


don't seem to backup your assertion, and I'm curious due to the fact I am 
planning to use a Linux software RAID 5 with drbd in the near future.

I would think that putting the meta data in a separate partition, which is not 
in the data disk (array) would be sensible even if using no RAID, as seeking 
issues seem to have been a common thread in many of the recent 'how do I speed 
up drbd' list messages.  Or is this what you meant by 'never put a drbd meta 
disk on a MD RAID..."?

Thanks for helping me understand.

Todd Denniston
Crane Division, Naval Surface Warfare Center (NSWC Crane)
Harnessing the Power of Technology for the Warfighter

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