Initial ΔV4 numbers

Thought a few people would like to see this. 8GB RAM machine, 24 drives, 36TB raw, 31.5 raw after RAID6 with 1 hot spare. 29TB usable (there is some serious rounding error in many of the tools as I have discovered last night 🙁 1 TiB = 1.0995 1TB, and 29T = 31.8 TB … go figure …)



root@dv4:~# df -h /data
Filesystem Size Used Avail Use% Mounted on
/dev/md0 29T 24G 29T 1% /data

and the file

root@dv4:~# ls -alFh /data/big.file
-rw-r--r-- 1 root root 24G 2008-12-18 17:59 /data/big.file

and the read performance with large blocks …

root@dv4:~# dd if=/data/big.file of=/dev/null ...
1024+0 records in
1024+0 records out
25394413568 bytes (25 GB) copied, 29.4996 s, 861 MB/s

and with smaller blocks

root@dv4:~# dd if=/data/big.file of=/dev/null bs=256k
96872+0 records in
96872+0 records out
25394413568 bytes (25 GB) copied, 25.4089 s, 999 MB/s

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