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Questions tagged [ceph]

The tag has no usage guidance.

-2
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0answers
18 views

Can Ceph run on low RAM?

I have old servers which can host maximum 8gb of RAM. I would like to put 12TB disks into them and feed them to Ceph for cold storage. Ceph's manual says that there should be 1GB of RAM for every 1TB ...
1
vote
0answers
17 views

Open-iSCSI Target IQN Naming Case

I'm using LRBD to configure iSCSI targets from a Ceph cluster, LRBD uses Open-iSCSI/targetcli to configure the targets. When I use an uppercase letter in the unique part of the iqn (after the colon),...
0
votes
1answer
64 views

Ceph Monitor iptables rules strange behaviour

I'm trying to set up iptables for a Ceph cluster. I'm currently putting rules together for one of the monitor servers. The monitor daemon listens on tcp/6789 (ip address removed as it is a public ...
0
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1answer
41 views

Ceph filesystem from old pools

I have deleted a Ceph filesystem, and copied the metadata and data pools. Is it possible to recreate the filesystem from these copies?
0
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1answer
178 views

Is it possible to increase Ceph throughput with multi-port NICs without LACP?

My Ceph cluster consists of 3 rather old servers storage servers, and a Netgear GS724Tv1, which does not appear to support LACP. I have already set up a separate cluster network and public network, ...
1
vote
1answer
205 views

Ceph create pool / Crush map max_size

I have the default bucket types type 0 osd type 1 host ... type 10 root and three host buckets: host cluster01a { id -2 # do not change unnecessarily # weight 1.607 alg straw hash 0 # ...
1
vote
1answer
185 views

Ceph with many small monitors/mds

Ceph documentation (http://docs.ceph.com/docs/jewel/start/hardware-recommendations/) puts an emphasis on the need for more powerful hardware as the cluster scales. For instance hardware specs for ...
1
vote
0answers
330 views

Ceph for small files?

Currently I have 6 dedicated servers in a data center. Two Servers are Mailservers running exim and dovecot (Maildir) and 4 Webservers. Each Server has two 3TB HDDs. My current problem is, that we ...
1
vote
2answers
740 views

ceph luminous osd memory usage

I am trying to build small CEPH cluster on single box - testing in the lab, before switching bigger probject to it. Run into memory problems and can not find way to control it. We have old Core2Duo ...
0
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0answers
358 views

Change the subnet on which a Ceph cluster lives

Is there a way to change the subnet ("cluster network") used for a Ceph cluster without having to basically rebuild it from scratch? The Ceph cluster lives on the same machines that make up a PVE HA ...
1
vote
2answers
49 views

Running a program with autologin not working like running on bash

I wrote a program and its automatically installs ceph. This program works fine when I run manually But when I login automatically with getty (my conf below) and run the program as last line in /etc/...
0
votes
2answers
110 views

ceph-mon fails to start on rasberry pi (raspbian 8.0)

ceph-mon fails to start on rasberry pi (raspbian 8.0) I recently purchased 3 raspberry pi nodes to create a small storage cluster to test with at my home. I found a couple of procedures on setting ...
0
votes
1answer
128 views

how to check if two servers are replicated properly on ceph cluster

Recently I built ceph with two server configuration. most uneasy thing is that i don't know how to check if two servers are replicated properly on ceph cluster. Does anyone using ceph confirm that ...
1
vote
1answer
327 views

How to mount using ceph-fuse and specify IP in /etc/fstab?

My server configuration is as follows: A ceph cluster server(10.1.1.138) B ceph cluster server(10.1.1.54) C ceph client (10.1.1.238) I could mount using the following ceph-fuse command: sudo ceph-...
1
vote
1answer
445 views

mount cephfs failed because of failure to load kernel module

I got a confused issue in docker as below: After install ceph successfully, i want to mount cephfs but failed: [root@dbffa72704e4 ~]$ /bin/mount 172.17.0.4:/ /cephfs -t ceph -o name=admin,secretfile=...
1
vote
1answer
311 views

does CEPH RBD mount on Linux support boot device?

Does CEPH RBD mount on Linux support boot device? for RBD deployment, example would be like this: http://blog.programster.org/ceph-deploy-and-mount-a-block-device
1
vote
1answer
1k views

Comparison of Ceph vs btrfs for single node storage

Single Node Ceph: Your Next Home Storage Solution makes case for using Ceph over ZFS on a single node. This got me wondering about Ceph vs btrfs: What are the advantages / disadvantages of using ...
2
votes
1answer
3k views

Using ceph storage directly for docker volumes

Does Docker or Kubernetes support Ceph storage interfaces (objects, red, cephfs)?
0
votes
1answer
971 views

[ceph_deploy][ERROR ] RuntimeError: NoSectionError: No section: 'ceph'

Follow the official docs:http://docs.ceph.com/docs/master/start/quick-start-preflight/#rhel-centos I do the below configuration of the ceph.repo: [ceph-noarch] name=Ceph noarch packages baseurl=http:...
0
votes
3answers
898 views

Require liblttng when I install the ceph in CentOS7.2

When I install the ceph and ceph-radosgw in my CentOS 7.2: yum -y install ceph ceph-radosgw I get the below error: ...... --> Finished Dependency Resolution Error: Package: 1:ceph-base-10.2.9-0....
1
vote
2answers
526 views

RuntimeError: NoSectionError: No section: 'ceph-source'

When I use ceph-deploy to install the ceph to every node: ceph-deploy install node0 node1 node2 I get the below error: [node1][WARNIN] check_obsoletes has been enabled for Yum priorities plugin [...
2
votes
1answer
764 views

How to delete a invalid osd in ceph cluster?

[root@dev-master ceph-cluster]# ceph osd tree ID WEIGHT TYPE NAME UP/DOWN REWEIGHT PRIMARY-AFFINITY -1 0.01740 root default -4 0.00580 host osd2 0 0.00580 osd.0 down 0 ...
1
vote
1answer
785 views

Recover VM Images from dead ceph cluster

A few days ago our Ceph Cluster died - nobody knows why, but it seems that the monitors just got deleted. When trying to re-add them to the ceph.conf we get timeouts when starting ceph and these ...
4
votes
1answer
580 views

Ceph - Prepare Shared SSD For Journaling

The Ceph documentation for adding drives shows the use of the prepare statement twice, with the same drive for the journal as shown below (where /dev/ssd is the journal drive): Once the prepare ...
1
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0answers
1k views

ceph fs apply latency too high resulting in high load in VMs

I have some problems in a ceph cluster. The fs_apply_latency is too high which leads to high load and slow responding qemu VMs (which use ceph images as VHD). The setup is: 5 hosts with 4 HDDs and 1 ...
4
votes
2answers
1k views

Can I enable cephx authentication using a pool in qemu/kvm?

(CentOS 7, Ceph Incunabulus, everything patched up to date) Background I've got a working converged Ceph/qemu/kvm cluster with cephx enabled for authentication. I'm trying to use this to store block ...
2
votes
1answer
576 views

Problems with overall ceph performance with QEMU

I am experiencing some performance problems with my QEMU KVMs on my ceph cluster. The cluster has 4 nodes with 4x1TB drives each, 48/64GB RAM, Intel Xeon and AMD Opterons. They are interconnected by ...
1
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0answers
127 views

Remove orphaned rados block device

I'm testing ceph at the moment. Today I decided to start over with my cluster and deleted the old one to setup a new one. I forgot to unmap and delete a mapped rbd device from another host. Now I see ...
1
vote
1answer
553 views

Using a rados block device as block device in libvirt qemu

What is the difference between using a rados block device in libvirt qemu with disk type='network' and disk type='block'? The ceph guide tells me to do the following: <disk type='network' device='...