> -----Original Message----- > From: Nathaniel Rutman [mailto:[EMAIL PROTECTED] > Sent: Wednesday, February 07, 2007 12:22 PM > To: Lin Shen (lshen) > Cc: [email protected] > Subject: Re: [Lustre-discuss] disk space needed to run MDS > > Lin Shen (lshen) wrote: > > > > > > > >> -----Original Message----- > >> From: Andreas Dilger [mailto:[EMAIL PROTECTED] > >> Sent: Monday, February 05, 2007 9:03 AM > >> To: Lin Shen (lshen) > >> Cc: [email protected] > >> Subject: Re: [Lustre-discuss] disk space needed to run MDS > >> > >> On Feb 02, 2007 10:25 -0800, Lin Shen (lshen) wrote: > >> > >>> Could you explain a bit more how the number 400M was > decided? Ext3 > >>> itself won't need that much disk space, right? Also, is > this number > >>> related to the total capacity of the Luster filesystem? In other > >>> words, will the MDS always need 400M to work properly for a > >>> > >> filesystem > >> > >>> of size 1T or just 1G? By switching to a different underline > >>> filesystem (i.e., from ext3 to ext2), can this number be lowered? > >>> > >> In fact you do NOT need the full 400MB of journal space, and lconf > >> will not create a journal that large if you have a smaller > >> filesystem. > >> > > > > With 1.6beta, I guess the journal is created by mkfs.lustre > --mdt. How > > does it know the size of the file system? > > > > > mkfs.lustre uses the BLKGETSIZE64 ioctl for the disk size.
That's only the size of the disk for running mdt, right? It's not the file system size since maybe it's unknown at the time that mkfs.lustre --mdt is issued (OSTs could be added in the future). > _______________________________________________ Lustre-discuss mailing list [email protected] https://mail.clusterfs.com/mailman/listinfo/lustre-discuss
