On Mar 20, 2020, at 13:02, Mannthey, Keith
<keith.mannt...@intel.com<mailto:keith.mannt...@intel.com>> wrote:
I am doing some work with Lustre 2.13 (Downloaded from Whamcloud) and DNE 2
there are 6 MDTs.
"
[root@colts52-clx01 for-test]# lfs getdirstripe TEST
lmv_stripe_count: 6 lmv_stripe_offset: 1 lmv_hash_type: fnv_1a_64
mdtidx FID[seq:oid:ver]
1 [0x2c0000400:0x5:0x0]
5 [0x300000403:0x5:0x0]
3 [0x340000403:0x5:0x0]
0 [0x200000403:0x5:0x0]
4 [0x240000402:0x5:0x0]
2 [0x280000401:0x5:0x0]
[root@colts52-clx01 for-test]# mkdir TEST/now
[root@colts52-clx01 for-test]# lfs getdirstripe TEST/now/
lmv_stripe_count: 0 lmv_stripe_offset: 2 lmv_hash_type: none
"
Directory stripping settings are not being propagated. Is this expected?
Yes, this working as designed. It isn't necessarily good for all directories
to be striped, as that adds overhead without necessary improving performance.
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.
Cheers, Andreas
--
Andreas Dilger
Principal Lustre Architect
Whamcloud
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