hello
my intention was to show , how you can tune up a pool of drives
(how much can you reach when using sas compared to 2 TB high capacity drives)
and now the other results with same config and sas drives:
<pre>
wd 2TB x 7, z3, dedup and compress on, no ssd
daten 12.6T start 2010.02.17 8G 202 MB/s 83
10 MB/s 4 4.436 MB/s 5 135 MB/s 87 761 MB/s
sas 15k, 146GB x 4, z3+dedup and compress off, no ssd:
z3nocache 544G start 2010.02.18 8G 71 MB/s 31
84 MB/s 15 47 MB/s 13 87 MB/s 55 113
MB/s
sas 15k, 146GB x 4, z3+dedup and compress on, no ssd:
z3nocache 544G start 2010.02.18 8G 218 MB/s 99
410 MB/s 92 171 MB/s 50 148 MB/s 92 578
MB/s
sas 15k, 146GB x 4, z3+dedup and compress on + ssd read cache:
z3cache 544G start 2010.02.17 8G 172 MB/s 77
205 MB/s 40 95 MB/s 27 141 MB/s 90 546
MB/s
##################### result ##################################
all pools are zfs z3
sas are Seagate 15K/m drives, 146 GB
seq-write-ch seq-write-block rewrite
read-char read-block
wd 2gb x7 202 MB/s 10 MB/s 4,4 MB/s 135
MB/s 761 MB/s
sas 15k x 4 no dedup: 71 MB/s 84 MB/s 47 MB/s 87
MB/s 113 MB/s
sas 15k x 4 +dedup+comp: 218 MB/s 410 MB/s 171 MB/s 148
MB/s 578 MB/s
sas 15k x 4 +ded+ssd: 172 MB/s 205 MB/s 95 MB/s 141
MB/s 546 MB/s
conclusion:
if you need performance:
use fast sas drives
activate dedup and compress (if you have enough cpu power)
ssd read cache is not important in bonnie test
high capacity drives are very well in reading and seq. writing
</pre>
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