If I have multiple Areca controllers, is it possible to make a volume that spans boards?
No, not possible.
Depends what he means by "spans".
Two HBAs can share a SAS target. They can even trade off the target (usually done as a LUN, but RAID volumes can work as well) if one is having problems. Most high end SANs pack multiple SAS HBA/RAID devices that share all the LUNs dynamically as needed. In fact, it's required for redundancy and performance issues.
The key is, that only one HBA can control a target at a time. So no matter how many volumes you have, and which card has them, only one card is running a volume at the time. And even if one of the cards flat out dies, the other card will pick up the volume.
In a nut shell, a volume can be used by multiple boards, targeted by multiple boards, and swapped between boards. However it can't be managed by multiple boards at the same time.
Keep in mind that HBAs and volumes don't play by the same rules at the iSCSI, SAN, or other levels as they do with local RAID.
Habey DS-1280 is done, what to replace with? The verdict from Habey tech support is that the backplane is failing. Symptoms: Fan light on although fans are good, a recent drive disconnect trigging a RAID & filesystem rebuild.
What to replace it with? I've invested in 3T HGST and plan to start replacing them with the 8T He models. I'm leary of Habey, NORCO & Sans Digital based on various reviews. Not looking to abandon the SuperServer 5026T-T server that runs the array, but will be glad to upgrade the Areca 1680X to a SATA III card. Ideas?
Yeah, Gmail is a bit of a pain with that. Google has a number of restrictions in place. I have a tiny VM (64mb of RAM) set to be a mail relay for mine.
No, just a minimal Debian installation with Exim. 64mb of RAM and 1-2gb disk space is all it needs.
cert = stunnel.pem
socket = l:TCP_NODELAY=1
socket = r:TCP_NODELAY=1
client = yes
accept = 110
connect = pop.gmail.com:995
accept = 143
connect = imap.gmail.com:993
accept = 25
connect = smtp.gmail.com:465
Yes, CPU fan RPM is present on my 1882i.
Anyone know how to get rid of this annoying thing? http://faq.areca.com.tw/index.php?solution_id=1071
I get ~50 alerts daily from this and their solution doesn't work. This is with one of the Supermicro SAS2 backplanes and an 1882i.
I checked my 1880i and no RPM on it either, so guess not. If the Chenbro expander doesn't pass temperatures, you might be out of luck. My LSI ones do.
Yes, I did try the solution they posted (with many reboots).
Rebuild performance probably won't be improved. Your sequential data transfer rates won't go up. If you're doing random access, you'll get an improvement proportional to the number of cache hits you get. If you have a BBU, you can enable write-back and get some improvement on random and bursty sequential writes; the amount of improvement you see will be dependent on your workload.