Hi,
Our VM has been using ceph as block storage for both system and data
patition.
This is what dd shows,
# dd if=/dev/zero of=test.file bs=4k count=1024k
1048576+0 records in
1048576+0 records out
4294967296 bytes (4.3 GB) copied, 16.7969 s, 256 MB/s
When dd again with fdatasync argument,the result is similar.
# dd if=/dev/zero of=test.file bs=4k count=1024k conv=fdatasync
1048576+0 records in
1048576+0 records out
4294967296 bytes (4.3 GB) copied, 17.6878 s, 243 MB/s
My questions include,
1. for a cluster which has more than 200 disks as OSD storage (SATA
only), both the cluster and data network are 10Gbps, does the
performance from within the VM behave well as the results above?
2. is "dd" suitable for testing a block storage within the VM?
3. why "fdatasync" influences nothing on the testing?
Thank you.
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