Tests performed.

For the tests that were performed:

• Write tests using the command
  • The command was used:
    • dd if=/dev/zero of=/filesystemtotest/iotest.log bs=64k count=8k conv=fdatasync
  • Write tests using directory objects
    • 50,000 objects were modified only by changing the description attribute.
    • The write/read Azure cache is left on.
    • Three control tests were performed only using a single p10-type disk
    • Three control tests were performed using the 5-disk p10 array.

Control test

Write test dd command:

/home/novell # dd if=/dev/zero of=/mnt/iotest.log bs=64k count=8k conv=fdatasync

8192 0 records in

8192 0 records out

536870912 bytes (537 MB, 512 MiB) copied, 5.685 s, 94.4 MB/s

Proof of writing objects tothe directory

Stripped test

Write test dd command:

/home/novell # dd if=/dev/zero of=/nds/iotest.log bs=64k count=8k conv=fdatasync

8192 0 records in

8192 0 records out

536870912 bytes (537 MB, 512 MiB) copied, 0.429201 s, 1.3 GB/s

Conclusion

Using thetripped array s in conjunction with the caches on shows an undeniable improvement. But this improvement should always be accompanied by backups via  dsbk  or azure images.

It is always important to validate that Azure caches are turned on.