Addonics Controller – 2 Disk RAID 1
Let’s switch our two disk arrangement from "performance" to "resiliency".
Theoretically a perfect RAID 1 set would provide double the throughput of a single disk for reads (and as low as half for writes), and depending on the number of requests outstanding, anywhere from the same latency to half that of the single disk.
Let’s see what ATTO makes of our two disk RAID 1 set:
Latency hasn’t changed, but the throughput dropped back to that of a single disk.
HDTach shows a similar result. Compared to the single disk environment, neither latency nor throughput has been affected (in either direction, positive or negative). We've gained resilience but there's no performance advantage.
Consistency is a wonderful thing. HDTune demonstrates clearly that there is no performance advantage to the RAID 1 environment, but at least we've managed resiliency.
Without the label in the drop down list, you'd be hard pressed trying to figure out which of the two results was the single disk and which was the RAID 1 set.
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|70.114.239.xxx |2009-12-30 06:46:59 outcast2k - product review gaps?good start on covering some of the basics. some other detais that would be good to know:
1) how long does a RAID rebuild take?
2) how do you tell how far a rebuild has left?
3) how do you tell which disk failed?
4) does the software UI handle 2+ HDM-XA's in the system?
5) how do you recover the RAID if the HDM-XA itself has failed and needs to be replaced?
6) what's the biggest sized drives supported? 2TB?
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|219.90.134.xxx |2010-03-07 23:17:32 TERRABYTEONE - ?? 3132 pciex1 card max output is 190mb/seciv tested this.. etc..
sil 3132 pci-e x1 card )(addtronics one) or jmb 363 or highpoint 4 port x1 2300 raid card.
max oot put is 190mb sec total.. and if using 2 ports its 95mb/sec..
tested this using 4x volir wd 300g hdd
(they get each 109mb/sec)
so if using both e-sata ports.. transfer maxes out at 190mb.sec..
if using 4 hdd in raid 0 etc... max output for 4x vr 300 on intel on-board raid (x48 chipset) 500+mb/sec..
on sil using this product is.. 90mb/sec.
als tryed 4x 1.5 tb 7200.11 hdd..max out at 90mb/sec
also tryed raid 5.. 90mb/sec.
2tb hdd supported. but hardware or nonhardware raid the sil raid gear does not support partitions bigger than 2tb.(old design)
to get 6 tb hdd spac out of in i raid 0 (4x 1.5tb)
i hd to make 4 partitions .. the software is limited in what size to make. it..it was tricky.. i had to make partitin/volumns 2+ then delet and recreat smaller ones. in aparticular order.
they need to update thar raid cards. (chan...
Thanks for the great write up!