ms_nocrc options is changed to the following in Hammer..
ms_crc_data = false
ms_crc_header = false
Rest looks good , you need to tweak the shard/thread based on your cpu complex and total number of OSDs running on a box..
BTW, with latest Intel instruction sets crc overhead is reduced significantly and you may want to turn back on..
Thanks & Regards
Somnath
-----Original Message-----
From: Stefan Priebe - Profihost AG [mailto:s.priebe@xxxxxxxxxxxx]
Sent: Sunday, January 24, 2016 11:48 PM
To: ceph-users@xxxxxxxxxxxxxx
Cc: Somnath Roy
Subject: optimized SSD settings for hammer
Hi,
is there a guide or recommendation to optimized SSD settings for hammer?
We have:
CPU E5-1650 v3 @ 3.50GHz (12 core incl. HT) 10x SSD / Node journal and fs on the same ssd
currently we're runnig:
- with auth disabled
- all debug settings to 0
and
ms_nocrc = true
osd_op_num_threads_per_shard = 2
osd_op_num_shards = 12
filestore_fd_cache_size = 512
filestore_fd_cache_shards = 32
ms_dispatch_throttle_bytes = 0
osd_client_message_size_cap = 0
osd_client_message_cap = 0
osd_enable_op_tracker = false
filestore_op_threads = 8
filestore_min_sync_interval = 1
filestore_max_sync_interval = 10
Thanks!
Greets,
Stefan
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