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: drbd-user-bounces at lists.linbit.com > [mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of Ross > S. W. Walker > Sent: Wednesday, February 21, 2007 5:14 PM > To: Gerry Reno > Cc: drbd-user at lists.linbit.com > Subject: RE: [DRBD-user] [Fwd: Re: [Linux-HA] heartbeat > 2.0.8: lockups]kerneloops > > > -----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. Ooops I meant BIO_RW_SYNC flag. > 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. > ______________________________________________________________________ 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.