Administrator Guide

Performance characterization
35 Dell EMC Ready Solution for HPC PixStor Storage | Document ID
limiting the performance to some degree. Since the inode size is 4KiB and it still needs to store metadata,
only files around 3 KiB will fit inside and any file bigger than that will use data targets.
Summary
The current solution was able to deliver fairly good performance, which is expected to be stable regardless of
the used space (since the system was formatted in scattered mode), as can be seen in
Benchmark
Peak Performance
Sustained Performance
Write
Read
Write
Read
Large Sequential N clients to N files
16.7 GB/s
23 GB/s
16.5 GB/s
20.5 GB/s
Large Sequential N clients to single shared file
16.5 GB/s
23.8 GB/s
16.2 GB/s
20.5 GB/s
Random Small blocks N clients to N files
15.8KIOps
20.4KIOps
15.7KIOps
20.4KIOps
Metadata Create empty files
169.4K IOps
127.2K IOps
Metadata Stat empty files
11.2M IOps
3.3M IOps
Metadata Read empty files
4.8M IOps
2.4M IOps
Metadata Remove empty files
194.2K IOps
144.8K IOps
Metadata Create 4KiB files
55.4K IOps
55.4K IOps
Metadata Stat 4KiB files
6.4M IOps
4M IOps
Metadata Read 4KiB files
37.3K IOps
37.3K IOps
Metadata Remove 4KiB files
1M IOps
219.5K IOps
Table 7. Furthermore, the solution scales in capacity and performance linearly as more storage nodes
modules are added, and a similar performance increase can be expected from the optional high demand
metadata module.
Table 7 Peak & Sustained Performance
Benchmark
Peak Performance
Sustained Performance
Write
Read
Write
Read
Large Sequential N clients to N files
20.4 GB/s
24.2 GB/s
20.3 GB/s
24 GB/s
Large Sequential N clients to single shared file
19.3 GB/s
24.8 GB/s
19.3 GB/s
23.8 GB/s
Random Small blocks N clients to N files
40K IOps
25.6K IOps
40K IOps
25.6KIOps
Metadata Create empty files
169.4K IOps
123.5K IOps
Metadata Stat empty files
11M IOps
3.2M IOps
Metadata Read empty files
4.7M IOps
2.4M IOps
Metadata Remove empty files
170.6K IOps
156.5K IOps
Metadata Create 4KiB files
68.1K IOps
68.1K IOps
Metadata Stat 4KiB files
8.2M IOps
3M IOps
Metadata Read 4KiB files
44.8K IOps
44.8K IOps
Metadata Remove 4KiB files
400K IOps
280K IOps