On 05/02/2015 02:53 AM, Matthew Monaco wrote: > It looks like you can get a pretty good performance benefit from using ext4 with > an "external" SSD journal. Has anyone tried this with ceph? Take, for example, a > system with a 3:1 HDD to SSD ratio. What are some of your thoughts? > > 3 ceph journal partitions + 3 ext4 journal partitions per SSD for the same set > of HDDs? Or maybe stagger it so hdd1,hdd2,hdd3 ceph journals are on ssd1, and > ext4 journals are on ssd2? > > Or perhaps drop ceph SSD journal and let it set on a partition at the start of > the HDD, with only ext4 SSD journals? > Sorry, I forgot to include a reference: http://www.raid6.com.au/posts/fs_ext4_external_journal/
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