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On Mar 20, 2020, at 13:02, Mannthey, Keith <<a href="mailto:keith.mannthey@intel.com" class="">keith.mannthey@intel.com</a>> wrote:<br class="">
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<div class="">I am doing some work with Lustre 2.13 (Downloaded from Whamcloud) and DNE 2 there are 6 MDTs.
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[root@colts52-clx01 for-test]# lfs getdirstripe TEST<br class="">
lmv_stripe_count: 6 lmv_stripe_offset: 1 lmv_hash_type: fnv_1a_64<br class="">
mdtidx FID[seq:oid:ver]<br class="">
1 [0x2c0000400:0x5:0x0]<br class="">
5 [0x300000403:0x5:0x0]<br class="">
3 [0x340000403:0x5:0x0]<br class="">
0 [0x200000403:0x5:0x0]<br class="">
4 [0x240000402:0x5:0x0]<br class="">
2 [0x280000401:0x5:0x0]<br class="">
[root@colts52-clx01 for-test]# mkdir TEST/now<br class="">
[root@colts52-clx01 for-test]# lfs getdirstripe TEST/now/<br class="">
lmv_stripe_count: 0 lmv_stripe_offset: 2 lmv_hash_type: none<br class="">
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Directory stripping settings are not being propagated. Is this expected? <br class="">
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<div>Yes, this working as designed. It isn't necessarily good for all directories to be striped, as that adds overhead without necessary improving performance.</div>
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<div>The current recommendation is that DNE should be used for e.g. a top-level directory to distribute files and subdirectories across MDTs, or in the case of large directories with millions of files.</div>
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<div>Cheers, Andreas</div>
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<div>Andreas Dilger</div>
<div>Principal Lustre Architect</div>
<div>Whamcloud</div>
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