On May 22, 2007 01:22 +0530, Kalpak Shah wrote: > __u16 s_raid_stride; /* RAID stride */ > - __u16 s_pad; /* Padding */ > + __u16 s_mmp_interval; /* Wait for # seconds in MMP > checking */ > + __u64 s_mmp_block; /* Block for multi-mount protection > */ Ted, I just noticed this updated patch w.r.t. your recent s_raid_stride addition. I also want to have a separate parameter for "s_raid_stripe_width" which is normally N * s_raid_stride, where N is the number of disks in a RAID 5 N+1 (or RAID 6 N+2) parity stripe. This is for delalloc+mballoc to allow it to align and size new allocations so that writes do not impose read-modify-write overhead on the RAID stripes. My understanding from the code is that s_raid_stride is to put the bitmaps for different groups on different disks to avoid always having a single disk busy with bitmap updates. Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc. - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
