MDS injectargs

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Hi,

I would like to reset "mds_cache_size" to its default value (0 in Luminous).

So I do :

    ceph tell mds.* injectargs '--mds_cache_size 0'

I also tried :

    ceph tell mds.* injectargs '--mds_cache_size = 0'

    ceph tell mds.* injectargs '--mds_cache_size=0'

But I always have errors like these for each MDS :

    2018-01-17 12:39:06.134654 7fdc557fa700  0 client.475461118
ms_handle_reset on 10.111.0.3:6800/2482597610
    Error EPERM: problem getting command descriptions from mds.host3
    mds.host3: problem getting command descriptions from mds.host3

My client.admin keyring is :

    client.admin
        key: XXXXXXXXXXXXX
        auid: 0
        caps: [mds] allow
        caps: [mgr] allow *
        caps: [mon] allow *
        caps: [osd] allow *

How can I change this value without restarting services ?

Thank you.

Florent

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