Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
> -----Original Message----- > From: Gerry Reno [mailto:greno at verizon.net] > Sent: Wednesday, February 21, 2007 5:07 PM > To: Ross S. W. Walker > Cc: drbd-user at lists.linbit.com > Subject: Re: [DRBD-user] [Fwd: Re: [Linux-HA] heartbeat > 2.0.8: lockups] kerneloops > > > > <snip> > > > > Are you per-chance doing "internal" storage of the > meta-data on these > > RAID-1 arrays? > > > > -Ross > > > > > Ross, > The DRBD metadata is stored in a separate logical volume on > the RAID-1 > arrays. 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 ______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.