19-Nov-15 17:34, Mark Nelson пишет:
This is actually the direction newstore is heading with the
newstore_min_alloc_size so that you can configure when to write into the
rocksdb WAL. By default it's set to 512k, but for SSDs we will almost
certainly want to go smaller.
On 11/19/2015 05:29 AM, Mike Almateia wrote:
Hello.
By now we have SSD disks with a great perfomance under O_DIRECT/O_SYNC
flags (and we recomended to use they for journal).
Why in a All-Flash type Ceph clusters we still use journal and them put
a data into OSD?
Why we can't just write a data into OSD with O_DIRECT/O_SYNC flags,
without journal?
Can we just switch off the journal functional for all-flash ceph
clusters?
Thanks for answer!
By now is it resonable to use NVMe Flash for OSD on Ceph? Overpower? Is
it possible to achive full speed NVMe Flash driver under Ceph?
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