p v wrote:
>
> Hello,
>
> I need to create large files fast without initializing them - in the
> past I used these steps -
>
> mkfs -t xfs -f -d unwritten=0 /dev/sda1 mount -t xfs -o noatime
> /dev/sda1 /hay touch /hay/foo xfs_io /hay/foo xfs_io> resvsp 0 1024g
> xfs_io> quit ls -i /hay/foo 131 /hay/foo umount /hay xfs_db -x
> /dev/sda1 xfs_db> inode 131 xfs_db> write core.size 1099511627776
> core.size = 1099511627776 xfs_db> q
Is there a reason that you don't want the unwritten flag set? (You know
that not using the unwritten extents feature exposes garbage from the
disk in this case?)
There may well be a legit reason but I just want to make sure you're
doing what you think you're doing :)
Thanks,
-Eric
> But unwritten=0 is failing as unrecognized option now (was it
> deprecated????) so I tried to clear the unwritten extent flag
> directly -
>
> xfs_db> a u.bmbt.ptrs[1] xfs_db> write recs[1].extentflag 0
> recs[1].extentflag = 1 xfs_db>
>
> It just won't change to 0 - any way to do this? Or is there any
> straightforward way to preallocate a large file and set it's file
> size without the unwritten flags being turned on?
>
> Thanks
>
> Peter Vajgel
>
>
>
>
>
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