JBOD = Just a Bunch of Disks right? Given when the unit connects on our work computers over USB3 and shows up as a single volume doesn't that mean the raid is not a JBOD?
Clearly I'm not up on configuring raid towers as it's never been something I had to do. I'm okay setting up an MacPro internal software raid but the rest is generally handled by the techs that set up the storage networks etc... So much to learn and so little time to tinker when it comes to storage.
---In Avid-L2@yahoogroups.com, <bogdan_grigorescu@...> wrote :
One more thing - even with an enclosure RAID controller, there is an instance where port multiplier ability is mandatory: when the RAID is configured as JBOD.
BG
www.finale.tv
From: "Bogdan Grigorescu bogdan_grigorescu@... [Avid-L2]" <Avid-L2@yahoogroups.com>
To: "Avid-L2@yahoogroups.com" <Avid-L2@yahoogroups.com>; "bigfish@..." <bigfish@...>
Sent: Thursday, September 22, 2016 10:21 AM
Subject: Re: [Avid-L2] OT: Esata port does not support port multipliers?
You can check in disk utility which drives the OS is capable of seeing, even if it cannot mount them.
Now if there is a RAID controller inside the enclosure, there is a chance you may simply need to install a driver/app for the enclosure from the Areca website, but it needs to be an exact match to what you have.
This does not explain though how the MBP is able to mount the volume, unless by conincidence, it has the drivers already installled.
BG,
www.finale.tv
From: "bigfish@... [Avid-L2]" <Avid-L2@yahoogroups.com>
To: Avid-L2@yahoogroups.com
Sent: Thursday, September 22, 2016 10:12 AM
Subject: Re: [Avid-L2] OT: Esata port does not support port multipliers?
I believe the tower unit has a raid card so all the drives show green after it goes through the startup cycle. They are green even with nothing plugged in. Now I understand the reason it won't connect because it is a port multiplied enabled enclosure.
I thought given it was a raid card setup that the hardware would provide the configuration of all 8 drives and then present that as one volume to the USB3 or Esata or any of the other ports. When plugged in on the work computers through USB3 it shows up as a single drive.
Not being someone who spends time setting up raid enclosures I don't follow all the specifics in the log in configuration menu but it seems that the enclosure would allow all kinds of ways to divide up the drives and have certain ones appear on one port, say USB, and other drives could appear on other ports like the eSata port. Seems very flexible but not novice user friendly.
I thought given it was a raid card setup that the hardware would provide the configuration of all 8 drives and then present that as one volume to the USB3 or Esata or any of the other ports. When plugged in on the work computers through USB3 it shows up as a single drive.
Not being someone who spends time setting up raid enclosures I don't follow all the specifics in the log in configuration menu but it seems that the enclosure would allow all kinds of ways to divide up the drives and have certain ones appear on one port, say USB, and other drives could appear on other ports like the eSata port. Seems very flexible but not novice user friendly.
---In Avid-L2@yahoogroups.com, <bogdan_grigorescu@...> wrote :
if the card is not port-multiplier enabled, then you can see only one drive out of 8 on your host system.
Usually the top drive in the enclosure. That should be confirmed by the drive status LEDs(1 active, 7 inactive).
BG
www.finale.tv
From: "John Moore bigfish@... [Avid-L2]" <Avid-L2@yahoogroups.com>
To: yahoogroups <avid-l2@yahoogroups.com>; "editing-list@yahoogroups.com" <editing-list@yahoogroups.com>
Sent: Wednesday, September 21, 2016 2:01 PM
Subject: [Avid-L2] OT: Esata port does not support port multipliers?
Trying to hook up an raid tower that seems to be made from Arcea parts given that's what the devices Log in says. The white box tower has no markings on it so I think it is some sort of home made kit. I'm hooking the unit up to an esata port on my 960GB OWC Mercury Accelsior_E2 PCI Express SSD with two eSATA Expansion ports. Up to 5x faster performance than an internal SATA drive with speeds up to 811MB/s read and 687MB/s write. Plug and Play*. 3 Year OWC Limited Warranty. (OWCSSDPHWE2R960)
I can't get it to mount MacPro but it will mount to MacBookPro using and express 34 to esata adapter.
Our tech person pointed out that this card has the following restriction"
Not compatible with port-multiplier enclosures"
Apparently that is the issue. I've been using these ports on Voyager dock and various Graid drives. I'm curious if it's uncommon to support port multiplier enclosures? Am I correct in assuming that a port multiplier enclosure would allow for multiple devices to be controlled down one eSata cable. In the case of this raid tower it looks like I could create various drive groups if I wanted. Right now the 8 drives are in one raid but if I were to configure the box to have say 4 2 drive raids is that when I would use the port multiplier function so that connecting one eSata cable would mount the 4 different raids? It reminds me of SCSI ID numbers but this is not an area I deal with often so I'm flying blind with a little help from our tech support.
John Moore Barking Trout Productions Studio City, CA bigfish@...
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