Aktuell gibt es bei NetCup wieder Sonderangebote, wie es sie bei NetCup häufiger gibt.
Einerseits kann man zwischen verschiedenen Größenpaketen wählen, als auch zwischen jeweils zwischen einer SSD und einer normalen SAS HDD.
Leider hab ich selbst keine Benchmarks dazu gefunden, beziehungsweise dann nur entweder von unterschiedlichen Servern oder sie waren sich selber nicht ganz sicher ob die Werste so stimmen können.
Also ganz einfach: selber messen. Dazu verwende ich die aktuellen Server (RS 2000) mit und ohne SSD, als auch meinen alten NetCup Server (M SSD v6) der ein Jahr alt ist.
Zuerst mit hdparm, mit und ohne Cache (-t -T), mit und ohne Kernel Page cache (–direct).
SAS – RS 2000 SAS G7SEa1
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root@SAS:~# hdparm -tT --direct /dev/sda1 /dev/sda1: Timing O_DIRECT cached reads: 2676 MB in 2.00 seconds = 1337.91 MB/sec Timing O_DIRECT disk reads: 8 MB in 0.05 seconds = 148.82 MB/sec |
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root@SAS:~# hdparm -tT /dev/sda1 /dev/sda1: Timing cached reads: 13612 MB in 2.00 seconds = 6811.80 MB/sec Timing buffered disk reads: 8 MB in 0.19 seconds = 41.73 MB/sec |
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root@SAS:~# hdparm -tT --direct /dev/sda1 /dev/sda1: Timing O_DIRECT cached reads: 2780 MB in 2.00 seconds = 1390.03 MB/sec Timing O_DIRECT disk reads: 8 MB in 0.09 seconds = 85.27 MB/sec |
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root@SAS:~# hdparm -tT /dev/sda1 /dev/sda1: Timing cached reads: 15900 MB in 2.00 seconds = 7956.80 MB/sec Timing buffered disk reads: 8 MB in 0.21 seconds = 38.39 MB/sec |
SSD – RS 2000 SSD G7SEa1
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root@SSD:~# hdparm -tT --direct /dev/sda1 /dev/sda1: Timing O_DIRECT cached reads: 1974 MB in 2.00 seconds = 986.61 MB/sec Timing O_DIRECT disk reads: 4450 MB in 3.00 seconds = 1482.72 MB/sec |
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root@SSD:~# hdparm -tT /dev/sda1 /dev/sda1: Timing cached reads: 13782 MB in 2.00 seconds = 6898.12 MB/sec Timing buffered disk reads: 2052 MB in 3.00 seconds = 683.34 MB/sec |
old SSD – Root-Server M SSD v6
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root@SSD:~# hdparm -tT --direct /dev/vda1 /dev/vda1: Timing O_DIRECT cached reads: 938 MB in 2.01 seconds = 467.00 MB/sec Timing O_DIRECT disk reads: 66 MB in 3.13 seconds = 21.07 MB/sec |
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root@SSD:~# hdparm -tT /dev/vda1 /dev/vda1: Timing cached reads: 16792 MB in 2.00 seconds = 8404.16 MB/sec Timing buffered disk reads: 22 MB in 3.52 seconds = 6.25 MB/sec |
Anschließend messen wir noch mal etwas genauer nach mit fio (Optionen aus dem Netcup-Thread genommen).
SAS – RS 2000 SAS G7SEa1
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root@SAS:~# fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=64 --size=4G --readwrite=randrw --rwmixread=75 test: (g=0): rw=randrw, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=64 fio-2.1.11 Starting 1 process Jobs: 1 (f=1): [m(1)] [100.0% done] [5454KB/1726KB/0KB /s] [1363/431/0 iops] [eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=2012: Sat Jan 21 14:18:58 2017 read : io=3071.7MB, bw=6406.4KB/s, iops=1601, runt=490984msec write: io=1024.4MB, bw=2136.4KB/s, iops=534, runt=490984msec cpu : usr=1.37%, sys=6.95%, ctx=890167, majf=0, minf=7 IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=0.1%, >=64=100.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.1%, >=64=0.0% issued : total=r=786347/w=262229/d=0, short=r=0/w=0/d=0 latency : target=0, window=0, percentile=100.00%, depth=64 Run status group 0 (all jobs): READ: io=3071.7MB, aggrb=6406KB/s, minb=6406KB/s, maxb=6406KB/s, mint=490984msec, maxt=490984msec WRITE: io=1024.4MB, aggrb=2136KB/s, minb=2136KB/s, maxb=2136KB/s, mint=490984msec, maxt=490984msec Disk stats (read/write): sda: ios=786285/262345, merge=0/72, ticks=30897848/1451668, in_queue=34153792, util=100.00% |
SSD – RS 2000 SSD G7SEa1
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old SSD – Root-Server M SSD v6
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root@SSD:~# fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=64 --size=4G --readwrite=randrw --rwmixread=75 !1839 test: (g=0): rw=randrw, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=64 fio-2.1.11 Starting 1 process test: Laying out IO file(s) (1 file(s) / 4096MB) Jobs: 1 (f=1): [m(1)] [100.0% done] [1188KB/388KB/0KB /s] [297/97/0 iops] [eta 00m:05s] test: (groupid=0, jobs=1): err= 0: pid=2742: Sat Jan 21 23:44:40 2017 read : io=3071.7MB, bw=266816B/s, iops=65, runt=12071512msec write: io=1024.4MB, bw=88977B/s, iops=21, runt=12071512msec cpu : usr=0.04%, sys=0.09%, ctx=35579, majf=0, minf=6 IO depths : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=0.1%, >=64=100.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.1%, >=64=0.0% issued : total=r=786347/w=262229/d=0, short=r=0/w=0/d=0 latency : target=0, window=0, percentile=100.00%, depth=64 Run status group 0 (all jobs): READ: io=3071.7MB, aggrb=260KB/s, minb=260KB/s, maxb=260KB/s, mint=12071512msec, maxt=12071512msec WRITE: io=1024.4MB, aggrb=86KB/s, minb=86KB/s, maxb=86KB/s, mint=12071512msec, maxt=12071512msec Disk stats (read/write): vda: ios=786522/269049, merge=0/6, ticks=579569992/187883904, in_queue=767498600, util=100.00% |
Vielen Dank an den Besitzer des SSD Servers für die Benchmarks.