Hi,
I'm planning to install a new Ceph cluster (Nautilus) using 8+3 EC,
SATA-only storage. We want to store here only big files (from 40-50MB to
200-300GB each). The write load will be higher than the read load .
I was thinking at the following Bluestore config to reduce the load
on the drives as much as possible and also to have a good storage
efficiency :
- stripe_unit for Jerasure EC profile = 256K
- bluestore_min_alloc_size_hdd = bluefs_alloc_size = 1M
- rados obj size = 4M
- rgw_max_chunk_size=4M = rgw_obj_stripe_size
What do you think ? Is there any gain in using a higher
rgw_max_chunk_size and/or rgw_obj_stripe_size (for example 20M instead
of 4M) ? What about bluestore_min_alloc_size and bluefs_alloc_size ?
Should I lower them to 512K or 256K ?
Thanks,
Adrian
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