Heheheh, I figured. What about mounting OST targets from multiple hosts, i.e. OST0000 and OST0001 on both oss-0-0 and oss-0-1? Just as bad?
Klaus On 10/12/07 10:38 AM, "Kilian CAVALOTTI" <[EMAIL PROTECTED]>did etch on stone tablets: > Hi Klaus, > > On Friday 12 October 2007 10:18:49 am Klaus Steden wrote: >> > I have redundant MDS/MDT servers, and when generating their >> > /etc/fstab files, I have them both list the MDT volume under their >> > mounted drives (so that they both mount the metadata volume). Being a >> > bit of a neophyte, I¹m not sure if this is the right thing to do. Is >> > this going to cause a problem in future? What are the possible >> > consequences of both hosts mounting the same metadata volume >> > simultaneously? How do the OSTs handle this situation? > > I'm afraid mounting the MDT device on both hosts is a very bad idea. Not > only for Lustre, but in a general fashion, unless you're using some > specific filesystem which has been designed in that goal (like OCFS2 or > GFS). A 'standard' filesystem like ext3 can't handle simultaneous > writes from different hosts at the same time. It's likely to cause > heavy data corruption in the MDT filesystem, and the OSTs are not > supposed to deal with anything like that. > > You can still reference the MDT device in both MDS' fstab, but be sure > you add the "noauto" option so the volume won't be mounted at boot. It > will be the high-availability provider's job (likely heartbeat) to deal > with mounting the MDT device on the active MDS. > > See > http://manual.lustre.org/manual/LustreManual16_HTML/DynamicHTML-08-1.html#wp10 > 35482 > for more details. > > Cheers, > -- > Kilian >
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