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On Tuesday 19 May 2015 08:54:26 Rich Freeman wrote: |
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> On Tue, May 19, 2015 at 6:13 AM, Neil Bothwick <neil@××××××××××.uk> wrote: |
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> > On Tue, 19 May 2015 10:02:38 +0100, Peter Humphrey wrote: |
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> >> > skip mdadm and lvm ... and try btrfs as you have the chance on shiny |
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> >> > new hardware |
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> >> |
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> >> I also have a spare external hard disk, which I could experiment with |
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> >> for snapshots etc. |
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> > |
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> > Snapshots are subvolumes in btrfs, so they stay in the same filesystem. |
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> > That's why they are so fast. |
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> > |
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> > It's a similar situation with ZFS. |
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> |
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> Yup. In both cases they're copy-on-write, so they don't consume |
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> additional space except to the extent that things change. |
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> |
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> Also, in both cases you can serialize a snapshot (either in its |
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> entirety or as a diff vs a previous snapshot) and store it on separate |
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> storage. This is mainly done for backup (storing the serialized |
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> files) or replication (replaying them onto another server with the |
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> same filesystem). |
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> |
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> But, neither ZFS nor btrfs are without issue on Linux, so I'd use care |
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> in a production environment. The btrfs issues tend to revolve around |
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> stability, and the zfs issues tend to revolve around dealing with |
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> out-of-mainline code and legal/license issues. |
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Well, this is my toy desktop, so no risk to fame and fortune there. By /toy/, |
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of course, I mean I play with it, not that it's a Mickey-Mouse setup (which |
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some of you pros out there might think it is anyway, but that's another |
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story). |
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Some people will remember that I had a fling with f2fs on my little Atom LAN |
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server some months ago; I don't think I'll be using that this time! |
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Incidentally, what's the received wisdom on frequency of file-system trimming |
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on SSDs these days? I've seen values quoted between twice a day and once a |
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week. And how does trimming affect btrfs? |
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Hmm. Looks like I'm hijacking Nuno's thread. Apologies if that's ruffled any |
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feathers, but I think I'm still on-topic, more or less, and he may still be |
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interested in the conversation. |
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- |
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Rgds |
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Peter |
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