[ceph-users] НА: How to improve latencies and per-VM performance and latencies

Hi! 1. Use it at your own risk. I'm not responsible to any damage, you can get by running thos script 2. What is it for. Ceph osd daemon have so called 'admin socket' - a local (to osd host) unix socket, that we can use to issue commant to that osd. The script connects to a list od osd hosts

Re: [ceph-users] OSD unable to start (giant - hammer)

Ok, just to update everyone, after moving out all the pg directories on the OSD that were no longer valid PGs I was able to start it and the cluster is back to healthy. I'm going to trigger a deep scrub of osd.3 to be safe prior to deleting any of those PGs though. If I understand the gist of

Re: [ceph-users] radosgw performance with small files

My hardware setup One OSD host - EL6 - 10 spinning disks with configuration - sda (hpsa0): 450GB (0%) RAID-0 == 1 x 450GB 15K SAS/6 - 31GB Memory - 1Gb/s ethernet line Monitor and gateway hosts have the same configuration with just one disk. I am benchmarking newstore

[ceph-users] PG object skew settings

Hi Is it safe to tweak the value of `mon pg warn max object skew` from the default value of 10 to a higher value of 20-30 or so. What would be a safe upper limit for this value? Also what does exceeding this ratio signify in terms of the cluster health? We are sometimes hitting this limit in

Re: [ceph-users] QEMU Venom Vulnerability

On 05/20/2015 11:02 AM, Robert LeBlanc wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA256 I've downloaded the new tarball, placed it in rpmbuild/SOURCES then with the extracted spec file in rpmbuild/SPEC, I update it to the new version and then rpmbuild -ba program.spec. If you install the

[ceph-users] HDFS on Ceph (RBD)

Hi Warren, Following our brief chat after the Ceph Ops session at the Vancouver summit today, I added a few more notes to the etherpad (https://etherpad.openstack.org/p/YVR-ops-ceph). I wonder whether you'd considered setting up crush layouts so you can have multiple cinder AZs or volume-types

Re: [ceph-users] How to improve latencies and per-VM performance and latencies

Hi, Just to add, there’s also a collectd plugin at https://github.com/rochaporto/collectd-ceph https://github.com/rochaporto/collectd-ceph. Things to check when you have slow read performance is: *) how much defragmentation on those xfs-partitions? With some workloads you get high values

Re: [ceph-users] QEMU Venom Vulnerability

On 05/21/2015 08:47 AM, Brad Hubbard wrote: On 05/20/2015 11:02 AM, Robert LeBlanc wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA256 I've downloaded the new tarball, placed it in rpmbuild/SOURCES then with the extracted spec file in rpmbuild/SPEC, I update it to the new version and then

[ceph-users] Three tier cache setup

Could be a stupid/bad question; is a three tier cache/mid/cold setup supported? Example would be: 1. Fast NVME drives — (write-back)— 2. Mid grade MLC SSD for primary working set —(write-back)— 3. Super-Cold EC Pool for cheapest-deepest-oldest data Theoretically, that middle tier of quality

Re: [ceph-users] QEMU Venom Vulnerability

Hi Brad! Thanks for pointing out that for CentOS 6 the fix is included! Good to know that! But I think that the original package doesn't support RBD by default so it has to be built again, am I right? If that's correct then starting from there and building a new RPM with RBD support is

Re: [ceph-users] radosgw performance with small files

On 05/19/2015 11:31 AM, Srikanth Madugundi wrote: Hi, I am seeing write performance hit with small files (60K) using radosgw. The radosgw is configured to run with 600 threads. Here is the write speed I get with file sizes of 60K # sudo ceph -s cluster