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On 09/15/2017 02:43 PM, Alan Mackenzie wrote: |
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> On Fri, Sep 15, 2017 at 23:38:21 +0200, Marc Joliet wrote: |
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>> Am Freitag, 15. September 2017, 23:15:05 CEST schrieb Alan Mackenzie: |
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>>> Yes, but do I want it to go away? What is it, what does it do? |
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> |
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>>> OK, let's try emerge -s thin-provisioning-tools. We get back only |
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>>> patronising garbage, namely "A suite of tools for thin provisioning on |
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>>> Linux" - well, duh! Who write's this stuff? |
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> |
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>>> So, WTF is thin provisioning? |
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> |
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>> I'm tempted to ask whether google is down or something, but I'm tired and |
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>> waiting for 7z to finish so here you go anyway: |
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> |
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> For me, google is permanently down. |
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> |
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>> https://en.wikipedia.org/wiki/Thin_provisioning |
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> |
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> Yes, I've read it, thanks. My question above was somewhat rhetorical. |
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> |
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>> I would say you probably don't need to care about it. |
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> |
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> I do. I need to spend time and effort removing it. It sounds like |
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> something only useful in servers, yet I have a desktop profile installed. |
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> |
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> There's something not quite right, here. |
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> |
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>> HTH |
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>> -- |
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>> Marc Joliet |
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>> -- |
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>> "People who think they know everything really annoy those of us who know we |
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>> don't" - Bjarne Stroustrup |
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> |
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The USE flag is likely enabled by default so users won't have to rebuild |
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all of lvm2 in order to get one small feature that may be useful in |
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self-hosting or experimental/learning scenarios. That is, the feature |
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seems useful enough to add as a default. But the default is in |
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sys-fs/lvm2, not in a profile: |
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|
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''' |
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# Assume gentoolkit is present |
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$ grep "+thin" $(equery w sys-fs/lvm2) |
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IUSE="readline static static-libs systemd clvm cman corosync lvm1 |
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lvm2create_initrd openais sanlock selinux +udev +thin device-mapper-only" |
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''' |
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|
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If you have app-portage/gentoolkit (I highly recommend it) you can run |
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`equery d sys-block/thin-provisioning-tools` to find what's pulling it |
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in. It's probably lvm2, which is expected if you use LVM for anything. |
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If you don't have any need for it: |
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|
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* Add `USE="-lvm"` to make.conf to ensure you don't get LVM through IUSE |
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* Add `sys-fs/lvm2` to package.mask, but realize you may lose partial |
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functionality with some things, like net-fs/nfs-utils NFS v4.1 support. |
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* emerge --changed-use --ask @world |
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* emerge --ask --depclean |
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|
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or |
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|
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* Put `sys-fs/lvm2 -thin` in package.use, run `emerge --changed-use |
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--ask @world`, and go about your day. |
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|
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If you want to learn what thin provisioning is, you'll have to do |
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research on it. Manpages, project pages, fora, tutorials, etc. A good |
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way to find detailed information is to look up support threads and see |
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what difficulties other people are having, so you can go straight to |
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useful advice. (search terms like "problem lvm thin provision") If the |
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software's remotely popular, you'll get some good results. Since we've |
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already established lvm2 uses it, you can consult its documentation |
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(usually found from HOMEPAGE) and get an idea for what it is. Some |
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terminology is understood differently in specialized scenarios, so the |
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only way to learn it is to read it. |
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|
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A Web search for 'lvm thin provisioning' turned up results from Red Hat, |
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tech blogs, and other sources. This information is easily available, if |
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you're willing to seek it. |
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-- |
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Daniel Campbell - Gentoo Developer, Trustee, Treasurer |
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OpenPGP Key: 0x1EA055D6 @ hkp://keys.gnupg.net |
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fpr: AE03 9064 AE00 053C 270C 1DE4 6F7A 9091 1EA0 55D6 |
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