[Lustre-discuss] Redundant mkfs.lustre options?

[Charland, Denis]

It looks like the two following mkfs.lustre options are the same:

--mountfsoptions="stripe="  and  --mkfsoptions "-E stripe-width="

>From documentation:

--mountfsoptions="stripe=<stripe_width_blocks>"

where <stripe_width_blocks> = <stripe_width> / 4K

we known that <stripe_width> = <chunksize> * <number of data disks>

so <stripe_width_blocks> = <chunksize> * <number of data disks> / 4k

we also know that <stride-size> = <chunksize> / 4K

that gives <chunksize> = <stride-size> * 4K

so <stripe_width_blocks> = <stride-size> * 4K *<number of data disks> / 4K = <stride-size> * <number of data disks>

Finally we have

mkfs.lustre . . . --mountfsoptions="stripe=<stride-size>*<number of data disks>"

And from mkfs.lustre and mke2fs man pages, we have:

mkfs.lustre . . . -mkfsoptions "-E stripe-width=<stride-size>*<number of data disks>"

Are these two options redundant and only one of them should be specified?

Denis Charland
UNIX Systems Administrator
National Research Council Canada
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