Just a reminder folks, when you bring online a new Ceph node with a bunch of new(Or existing) OSD's you might see it blocking IO's for some reason. This might show as "Requests are blocked > 32 sec" or simply as the VM's accessing the cluster are stalling and or reporting their own IO issues. FIREWALL!! …

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To show what routes you are receiving from a particular peer on Mikrotik 1ip route print detail where received-from={PeerName} OR 1ip route print detail where bgp-as-path=123456

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Lots of talk but not a lot of info online. This worked for me I'm enabling replication t pool level here. Not only images that have the 'journaling' feature enabled will be mirrored irrespective of the state of your pool. So to clarify, you need to enable replication on the pool AND enable the journaling feature on the …

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RBD export works great, sometimes too great and can overload the disks it's writing too, if those disks happen to be serving say VM's then goodnight VM. Solution - Use throttle Example - Export at 50MB\s 1rbd export volumes/volume-371b6662-1bc2-4dad-8545-c30ec1f0bfce - | python /root/throttle.py --bandwidth=52428800 …

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From http://www.kontron.com/downloads/software/fastpath-configuration-guide-v1.2.pdf?product=89439 3.2.1.2 Example 2: Set Up VLAN Routing for the VLANs and the Switch. The following code sequence shows how to enable routing for the VLANs: 1(Ethernet Fabric) #vlan database 2(Ethernet Fabric) (Vlan) #vlan routing 10 …

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A quick little script to generate a random string in the right format for a S3 style Secret and Access Key 1SYSTEM_ACCESS_KEY=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 20 | head -n 1) 2SYSTEM_SECRET_KEY=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 40 | head -n 1) 3 echo "Access Key - …

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Check replication See how much journal data is yet to be replicated, where 'sas' is the pool containing the journal data 1rados ls -p sas | grep journal | wc -l Enable mirroring for an image Step 1 - Enable journaling feature for the image(You can place the journal data on a separate pool) 1rbd feature enable …

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1qemu-img info -f rbd rbd:volumes/CW-ICE-Linux1.raw:conf=/etc/ceph/adleast.conf 1qemu-img convert -f vhdx -O raw server.vhdx rbd:volumes/TS11.raw:conf=/etc/ceph/adleast.conf 1qemu-img resize -f rbd "rbd:rbd/myrbd" 600G http://cephnotes.ksperis.com/blog/2013/06/11/ceph-rbd-online-resize

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1ceph -n osd.10 --show-config --cluster=adleast Something like this might be useful 1ceph -n osd.10 --show-config --cluster=adleast | grep backfillđ See here for an awesome cheatsheet

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Installation 1Yum install Lib_Utils-1.00-08.noarch.rpm MegaCli-8.01.06-1.i386.rpm (i386 binary works ok on x64 servers) List all controllers 1/opt/MegaRAID/MegaCli/MegaCli64 -AdpAllInfo -aALL List all physical disks 1/opt/MegaRAID/MegaCli/MegaCli64 -PDlist -a0 | grep -e '^Enclosure Device ID:' -e '^Slot …

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