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Ceph needs quite many nodes to aggregate reasonable performance. If you only have two DRBD is your best friend.


The general advice for this is to maximize your system RAM (ARC), and then add L2ARC if the need is there. This can be measured using the arcstat command in your server. Something like: -f "time,read,hit%,hits,miss%,miss,arcsz,c" 1 Where the output shows the time number of reads/second, the hit ratio, the number of hits/misses, and the ...


Is there any impact on performance from a kvm guest if I create ext4 on this large drive directly, mount it up on the host like /mnt/kvms and then create raw kvm disk image on it? Every time, when your data have more layers to go through performance degradation and latency increase will appear. For example: Qemu RAW file -> Ext4 -> LVM -> RAID1 device -...


Your pool black currently consists of two mirrored WD10JFCX drives, which according to Western Digital's spec sheet are: 5400 rpm (rotational latency about 5 ms on average, 11 ms worst case) 16 MB cache 1 TB 2.5" form factor SATA 6 Gb/s (SATA 3) Neither the 5400 rpm rotation speed nor the puny 16 MB on-drive cache is conducive to highest performance, and ...

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