Hi,
Is there anyone using DELL servers with PERC controllers willing to provide
advise on configuring it for good throughput performance ?
I have 3 servers with 1 SSD and 3 HDD each
All drives are Entreprise grade
Connector : 00<Internal><Encl Pos 1 >: Slot 0
Vendor Id : TOSHIBA
Product Id : PX04SHB040
State : Online
Disk Type : SAS,Solid State Device
Capacity : 372.0 GB
Power State : Active
Connector : 00<Internal><Encl Pos 1 >: Slot 1
Vendor Id : TOSHIBA
Product Id : AL13SEB600
State : Online
Disk Type : SAS,Hard Disk Device
Capacity : 558.375 GB
Power State : Active
Created OSD with separate WAL(1 GB) and DB (15 GB) partitions on SSD
rados bench is abysmal
The interesting part is that testing drives with fio is also pretty bad -
that is why I am thinking that my controller config might be the culprit
See below results using various config
Commands used
megacli -LDInfo -LALL -a0
fio --filename=/dev/sd[a-b] --direct=1 --sync=1 --rw=write --bs=4k
--numjobs=5 --iodepth=1 --runtime=60 --time_based --group_reporting
--name=journal-test
SSD drive
Current Cache Policy: WriteThrough, ReadAheadNone, Cached, No Write Cache
if Bad BBU
Jobs: 5 (f=5): [W(5)] [100.0% done] [0KB/125.2MB/0KB /s] [0/32.5K/0 iops]
[eta 00m:00s]
Current Cache Policy: WriteThrough, ReadAheadNone, Direct, No Write Cache
if Bad BBU
Jobs: 5 (f=5): [W(5)] [100.0% done] [0KB/224.8MB/0KB /s] [0/57.6K/0 iops]
[eta 00m:00s]
HDD drive
Current Cache Policy: WriteBack, ReadAdaptive, Direct, No Write Cache if
Bad BBU
Jobs: 5 (f=5): [W(5)] [100.0% done] [0KB/77684KB/0KB /s] [0/19.5K/0 iops]
[eta 00m:00s]
Current Cache Policy: WriteBack, ReadAdaptive, Cached, No Write Cache if
Bad BBU
Jobs: 5 (f=5): [W(5)] [100.0% done] [0KB/89036KB/0KB /s] [0/22.3K/0 iops]
[eta 00m:00s]
rados bench -p rbd 120 write -t 64 -b 4096 --no-cleanup && rados bench -p
rbd 120 -t 64 seq
Total time run: 120.009091
Total writes made: 630542
Write size: 4096
Object size: 4096
Bandwidth (MB/sec): 20.5239
Stddev Bandwidth: 2.43418
Max bandwidth (MB/sec): 37.0391
Min bandwidth (MB/sec): 15.9336
Average IOPS: 5254
Stddev IOPS: 623
Max IOPS: 9482
Min IOPS: 4079
Average Latency(s): 0.0121797
Stddev Latency(s): 0.0208528
Max latency(s): 0.428262
Min latency(s): 0.000859286
Total time run: 88.954502
Total reads made: 630542
Read size: 4096
Object size: 4096
Bandwidth (MB/sec): 27.6889
Average IOPS: 7088
Stddev IOPS: 1701
Max IOPS: 8923
Min IOPS: 1413
Average Latency(s): 0.00901481
Max latency(s): 0.946848
Min latency(s): 0.000286236
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