On the test track: New JackRabbit, open the throttle wide …

I know, I know, I really should wait until the drive build is done. I know I should do that.
[root@Mj?lnir ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/md0 89G 6.8G 77G 9% /
tmpfs 127G 0 127G 0% /dev/shm
/dev/sdc 48T 393G 47T 1% /data/3
/dev/sdb 48T 395G 47T 1% /data/2
/dev/sdd 33T 367G 33T 2% /data/4
/dev/sda 48T 374G 47T 1% /data/1
I called it Mj?lnir, as I liked this quote:

Mj?lnir is depicted in Norse mythology as one of the most fearsome weapons, capable of leveling mountains.

(or as I like to think of it)
… of data.
But I gotta know. How fast can this system run?
Start up our 1TB write. This is simply streaming 1TB of data out to the drives. Thats it. Only a file system. Simple stream. Uncached. So this is really … really streaming.
And its being burdened by the volume build. So we aren’t at maximum speed.
Light up fio with our test, and …
… start up dstat in another window, give it some time, and then …

  1   2  90   7   0   0|   0  6482M| 240B 1048B|   0     0 |  19k 6228
  1   2  90   7   0   0|   0  5908M|   0     0 |   0     0 |  18k 5523
  1   2  90   8   0   0|   0  5667M|4970B   11k|   0     0 |  18k 5565
  1   2  88  10   0   0|   0  6042M|   0     0 |   0     0 |  16k 5902
  1   2  90   8   0   0|   0  6663M|5894B   11k|   0     0 |  21k 6567
  1   2  90   7   0   0|   0  6479M|   0     0 |   0     0 |  20k 6229
  1   2  90   7   0   0|   0  6808M|7118B   14k|   0     0 |  22k 6660
----total-cpu-usage---- -dsk/total- -net/total- ---paging-- ---system--
usr sys idl wai hiq siq| read  writ| recv  send|  in   out | int   csw
  1   2  90   7   0   0|   0  6517M|   0     0 |   0     0 |  20k 6234
  1   2  90   7   0   0|   0  6905M|5090B   11k|   0     0 |  21k 6588
  1   2  90   7   0   0|   0  6696M|   0     0 |   0     0 |  23k 6331
  1   2  89   9   0   0|   0  6668M|1284B 2797B|   0     0 |  19k 6202
  1   1  89   9   0   0|   0  5301M|   0     0 |   0     0 |  15k 5020
  1   2  90   7   0   0|   0  5979M| 240B 1048B|   0     0 |  18k 5876

Yeah, its like that.
Imagine what this baby could do when its done with the build.
Imagine.
I’ll try to show you in a few hours.

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