[Lustre-discuss] lfs_migrate for rebalancing
Andrus, Brian Contractor
bdandrus at nps.edu
Sat Jul 16 09:30:45 PDT 2011
All,
Am I incorrect in the way I read that lfs_migrate can be used to rebalance a filesystem after adding OSTs?
Here is some output on a 22M file that was all on one OST and we now have 9:
[root at compute-3-1 ps2]# lfs getstripe PS01-071.xml
PS01-071.xml
lmm_stripe_count: 1
lmm_stripe_size: 1048576
lmm_stripe_offset: 6
obdidx objid objid group
6 4411098 0x434eda 0
[root at compute-3-1 ps2]# lfs_migrate -y PS01-071.xml
PS01-071.xml: done
[root at compute-3-1 ps2]# lfs getstripe PS01-071.xml
PS01-071.xml
lmm_stripe_count: 1
lmm_stripe_size: 1048576
lmm_stripe_offset: 4
obdidx objid objid group
4 50856625 0x30802b1 0
[root at compute-3-1 ps2]# cp PS01-071.xml PS01-071.xml.tmp
[root at compute-3-1 ps2]# lfs getstripe PS01-071.xml.tmp
PS01-071.xml.tmp
lmm_stripe_count: 9
lmm_stripe_size: 1048576
lmm_stripe_offset: 2
obdidx objid objid group
2 73524719 0x461e5ef 0
5 4389362 0x42f9f2 0
3 53566843 0x3315d7b 0
0 47139754 0x2cf4baa 0
6 4411100 0x434edc 0
1 56746451 0x361e1d3 0
8 4416089 0x436259 0
7 4411127 0x434ef7 0
4 50856626 0x30802b2 0
[root at compute-3-1 ps2]#
So it moved the file to another OST, but left the strip count as 1.
But when I cp'ed the file, it properly striped it across all the OSTs.
This doesn't seem all that useful for rebalancing.
Brian Andrus
ITACS/Research Computing
Naval Postgraduate School
Monterey, California
voice: 831-656-6238
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