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Unix and Linux Stack Exchange

Questions tagged [redundancy]

20 questions
10
votes
3 answers

Protecting data against bit rot

I have realized that I need to protect all of my photographs against bit rot (file corruption occurring at random due to errors in hard drives or network transfer). I recently discovered par2 which seems like a great program to create redundancy…
Jonatan Kallus
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9
votes
2 answers

How to make systemd-resolved stop trying to use offline DNS servers?

I have configured my DHCP server to supply two nameservers for redundancy, so that if one is offline the other one can be used. I have configured my PCs with systemd-resolved and according to resolvectl status it has picked up all the DNS servers…
Malvineous
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7
votes
2 answers

Archiving program that adds redundancy

I'm looking for a archiving program that adds redundancy to an archive. Example : I've got 500MB of data, and a 700MB media to burn it. Rather than waste 200MB, I want to use them to add redundancy. Then if some data is damaged, the archiving…
color2v
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7
votes
2 answers

How to shard file into n-out-of-m redundancy (erasure code e.g. kind of reed solomon)?

How to shard file file into m files, so it can be recovered with any n of them ? It looks like Erasure Code, preferably "optimal erasure codes". (Example of another application and proposed programming library: "You need erasure code"…
Grzegorz Wierzowiecki
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4
votes
0 answers

Split file F into M parts, recover file F from N of those M parts

I want to split a file into M parts, such that I can recover the file from N of those M parts. (Where M>N, and I get to choose both M and N). For example: I have FILE.IMG I split FILE.IMG into M=3 parts. I set the split-time encoding to allow me to…
Rick Ramstetter
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3
votes
0 answers

LVM: on simple raid1 with two legs Cpy%Sync never reaches 100% and always stays at 99.99%

On simple lvm raid1 with two legs Cpy%Sync never reaches 100% and always stays at 99.99%. lvm> lvs -a -o name,raid_sync_action,sync_percent LV SyncAction Cpy%Sync safe idle 99,99 [safe_rimage_0] …
Pedro Rolo
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3
votes
1 answer

Using WiFi port as redundant link

I want to use WiFi port of my server as redundant link for copper connection to my home DSL router. My router if SAGEM 2704 with very limited functionality. So practically the only possibility is to configure something on the server. Is it possible…
mackowiakp
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2
votes
2 answers

What is a good way of layering zfs filsystems to manage unpredictable future workload that doesn't severely compromise performance?

I've been playing around with ZFS and using sparse files as virtual devices to learn how to use the zfs tools. It seems that there isn't much of a hit in performance by creating a raid pool out of sparse files which are on top of JBOD filesystems…
barrymac
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2
votes
1 answer

Configure SSH keys for production and DR server

Here is the case, we have successfully configured SSH keys (and hence password-less SFTP connection) between ProdServer-A to ProdServer-B. It works, or so I thought still yesterday. Yesterday ProdServer-B failed over to DisasterServer-B. When it…
Guru
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1
vote
0 answers

Create redundant grub bootloader on Debian

I have a Debian based server, where every partition is RAIDed, except the one that has /boot/efi. This means that I will still have all my data after a disk failure, but the system may be unable to boot. Is there a good way to create a redundant…
sfphoton
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1
vote
0 answers

OpenLDAP Cluster

Trying to implement an OpenLDAP cluster, I already managed to set up the two backend LDAP servers in mirroring mode. The application (iRedMail) using the LDAP service is running on the same systems as the LDAP servers. This applications needs the…
arminV
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1
vote
0 answers

Ucarp with 2 interfaces

I have a server that has 2 interfaces which works like a router and a firewall too on debian. I want to use ucarp for redundency purposes. Question is how do i configure ucarp for 2 interfaces?
user19215
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1
vote
2 answers

Most ironclad way to make root installation redundant and maximize uptime? RAID, ZFS or something else?

I would like to set up my desktop computer (which is actually a server for the KVM guests I do my actual work in) to have a redundant root installation. If one drive dies I want to quickly get back to work without doing a full restore from backup,…
Stonecraft
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1
vote
0 answers

ICMPv6 send Multicast Listener Report Message and Neighbor Solicitation

I am configuring ucarp on two on my pc router ie master and slave. Master is turned off and then turned on, recorded in tshark slave application there is icmpv6 multicast listener report message and neighbor solicitation. But I do not configure ipv6…
Reski Wahyuni
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1
vote
1 answer

How to use one path in heredocument

I wrote this here-document to source a few scripts under the path ~/own_scripts/ but I wrote it in a way that causes duplication of this path: source <<-EOF ~/own_scripts/1.sh ~/own_scripts/2.sh # More scripts under ~/own_scripts; EOF Setting…
Arcticooling
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