Dell calls those sort of drives "Non-RAID" drives and that's what you would set them to be in either the iDRAC or the PERC BIOS.
Andrew Ferris Network & System Management UBC Centre for Heart & Lung Innovation St. Paul's Hospital, Vancouver http://www.hli.ubc.ca >>> Steven Vacaroaia <ste...@gmail.com> 1/31/2018 8:45 AM >>> Hi Sean, Thanks for your willingness to help I used RAID0 because HBA mode in not available on PERC H710 Did misunderstood you ? How can you set RAID level to NONE? Running fio with more jobs provide results closer to the expected throughput ( 450MB/s) for SSD drive fio --filename=/dev/sda --direct=1 --sync=1 --rw=write --bs=4k --numjobs=20 --iodepth=1 --runtime=60 --time_based --group_reporting --name=journal-test journal-test: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=sync, iodepth=1 ... fio-2.2.8 Starting 20 processes Jobs: 20 (f=20): [W(20)] [100.0% done] [0KB/400.9MB/0KB /s] [0/103K/0 iops] [eta 00m:00s] Steven On 31 January 2018 at 11:25, Sean Redmond <sean.redmo...@gmail.com> wrote: Hi Steven, Thats interesting, I use the same card, but I do use NONE RAID mode, this is a historical decision that was made so not much to share with you on that, maybe worth doing a fio test of RAID 0 vs NONE RAID mode to see what the difference is, if any. I have not used the SSD you are using, Did you manage to hunt out anyone else using the same one to compare the fio tests? Did you test the SSD in another HBA mode server / desktop to show this is only the case when using the PERC? Thanks On Wed, Jan 31, 2018 at 3:57 PM, Steven Vacaroaia <ste...@gmail.com> wrote: Raid0 Hardware Controller ProductName : PERC H710 Mini(Bus 0, Dev 0) SAS Address : 544a84203afa4a00 FW Package Version: 21.3.5-0002 Status : Optimal BBU On 31 January 2018 at 10:48, Sean Redmond <sean.redmo...@gmail.com> wrote: Hi, I have seen the Dell R730XD be using with a PERC controller extensively with ceph and not had any real performance issues to speak of. Can you share the exact model of PERC controller? Are you exposing the disks as individual RAID 0 or in NONE RAID mode? Thanks On Wed, Jan 31, 2018 at 3:39 PM, Steven Vacaroaia <ste...@gmail.com> wrote: 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 _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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