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From: Sergey Matveev <stargrave@stargrave•org>
To: nncp-devel@lists.cypherpunks.ru
Subject: Re: NNCP discussion on comp.mail.uucp
Date: Tue, 5 Jan 2021 18:07:07 +0300 [thread overview]
Message-ID: <X/SAm1s5dInAlPcN@stargrave.org> (raw)
In-Reply-To: <87ble4mw85.fsf@complete.org>
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*** John Goerzen [2021-01-04 11:46]:
>I think that since UUCPNET has been dead for more
>than two decades now, the only remaining UUCP networks are the small
>friend-to-friend kind anyhow.
Seems so indeed.
>NNCP automatic tossing.
>also had automatic calling
Both of these looks like easy to add.
>BTW, I have another post on the topic of ZFS and non-ZFS backups over NNCP:
>https://changelog.complete.org/archives/10186-more-topics-on-store-and-forward-possibly-airgapped-zfs-and-non-zfs-backups-with-nncp
Here I just want to add trivial comments for https://floss.social/@jgoerzen/105499269925205743
* Protection against Silent Data Corruption. Just want to mention that
automatic self-healing (data correction) is performed also on a setup
with just single disk. "Data" blocks, by default has just single copy
and obviously they can not be repaired without redundancy. But metadata
blocks ("inodes", dataset/zvol descriptions, block pointers, and so on)
by default has copies=2 and physically they have two copies on the
disk. Very important metadata blocks (meta object set (MOS),
überblock) has copies=3. So metadata has (by default) redundancy and
can be repaired by reading the copy from another part of the disk
* Built-in #compression with fast algorithms. Compression (at least the
most simple rle one) should be enabled also because sparse
(zero-filled) blocks won't be allocated at all. If no compression is
enabled, then sparse files will be allocated and written to the disk
--
Sergey Matveev (http://www.stargrave.org/)
OpenPGP: CF60 E89A 5923 1E76 E263 6422 AE1A 8109 E498 57EF
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next prev parent reply other threads:[~2021-01-05 15:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-04 5:50 NNCP discussion on comp.mail.uucp John Goerzen
2021-01-04 8:36 ` Sergey Matveev
2021-01-04 17:46 ` John Goerzen
2021-01-05 15:07 ` Sergey Matveev [this message]
2021-01-05 16:01 ` John Goerzen