One thing that is important to note here is that the syntax of "conf_param" is
not the same as "set_param" and "get_param". The conf_param syntax is what
sets the parameters permanently in the configuration log, while {get,set}_param
run on the local node only.
There is a newer "lctl set_param -P" interface that was added, to allow
permanently setting parameters using the (IMHO more familiar) "set_param"
syntax, but it has some problems that currently prevent it from being used more
widely. There is a Jira ticket open for this that has been getting some
attention recently, and hopefully the "set_param -P" functionality will be able
to replace conf_param completely in the future.
Cheers, Andreas
On Jun 6, 2017, at 05:41, Gibbins, Faye <[email protected]> wrote:
>
> Hi,
>
> I think I’ve found a bug in the manual:
> https://build.hpdd.intel.com/job/lustre-manual/lastSuccessfulBuild/artifact/lustre_manual.xhtml#dbdoclet.50438221_48757
> I’ve included it below in case this is the correct place to report it. If
> not please let me know and I’ll submit it elsewhere.
>
> In section 25.2.2. Enabling and Tuning Root Squash, the bit that says:
>
> Snip---
> Root squash parameters can also be changed with the lctl conf_param command.
> For example:
>
> mgs# lctl conf_param testfs.mdt.root_squash="1000:101"
> mgs# lctl conf_param testfs.mdt.nosquash_nids="*@tcp"
> Snip---
>
> Should be IMHO:
>
> Snip---
> Root squash parameters can also be changed with the lctl conf_param command.
> For example:
>
> mgs# lctl conf_param mdt.testfs-MDT0000.root_squash="1000:101"
> mgs# lctl conf_param mdt.testfs-MDT0000.nosquash_nids="*@tcp"
> Snip---
>
> Here is an example of me using my version compared to the documentation
> version using Lustre 2.8 on RHEL 7:
>
> Snip---
> 0 edi-vf-1-5:audiodb-MDT0000# lctl get_param mdt.audiodb-MDT0000.root_squash
> mdt.audiodb-MDT0000.root_squash=0:0
> 0 edi-vf-1-5:audiodb-MDT0000# lctl set_param
> mdt.audiodb-MDT0000.root_squash="0:1"
> mdt.audiodb-MDT0000.root_squash=0:1
> 0 edi-vf-1-5:audiodb-MDT0000# lctl get_param mdt.audiodb-MDT0000.root_squash
> mdt.audiodb-MDT0000.root_squash=0:1
> 0 edi-vf-1-5:audiodb-MDT0000# lctl set_param
> mdt.audiodb-MDT0000.root_squash="0:0"
> mdt.audiodb-MDT0000.root_squash=0:0
> # Using the documented version.
> 0 edi-vf-1-5:audiodb-MDT0000# lctl set_param audiodb.mdt.root_squash="0:1"
> error: set_param: param_path 'audiodb/mdt/root_squash': No such file or
> directory
> 0 edi-vf-1-5:audiodb-MDT0000#
> Snip---
>
> Yours
> Faye Gibbins
> Snr SysAdmin, Unix Lead Architect
> Software Systems and Cloud Services
> Cirrus Logic | cirrus.com | +44 (0) 131 272 7398
>
> <image001.png>
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Cheers, Andreas
--
Andreas Dilger
Lustre Principal Architect
Intel Corporation
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