July 15, 201213 yr Hi All, Many of you already know the AOC-SAS2LP-MV8 (http://www.supermicro.com/products/accessories/addon/aoc-sas2lp-mv8.cfm), it's becoming quite popular lately. This controller's bus is PCI-E x8 vs the previous version AOC-SASLP-MV8 (http://www.supermicro.com/products/accessories/addon/AOC-SASLP-MV8.cfm) which was PCI-E x4. My current board has 2 PCI-E 2.0 x4 ports and 2 PCI-E 3.0 x8 ports. All of them are in x8 slots. Since unRAID v5 will have support for 24 drives, I'm thinking of adding a third AOC-SAS2LP-MV8 which will go in a PCI-E 2.0 x4 (slot x8). Will be the drop in speed noticeable? Regards, daniel
July 15, 201213 yr Hi All, Many of you already know the AOC-SAS2LP-MV8 (http://www.supermicro.com/products/accessories/addon/aoc-sas2lp-mv8.cfm), it's becoming quite popular lately. This controller's bus is PCI-E x8 vs the previous version AOC-SASLP-MV8 (http://www.supermicro.com/products/accessories/addon/AOC-SASLP-MV8.cfm) which was PCI-E x4. My current board has 2 PCI-E 2.0 x4 ports and 2 PCI-E 3.0 x8 ports. All of them are in x8 slots. Since unRAID v5 will have support for 24 drives, I'm thinking of adding a third AOC-SAS2LP-MV8 which will go in a PCI-E 2.0 x4 (slot x8). Will be the drop in speed noticeable? Regards, daniel If you're using spinning disks, no. A 4X slot has way more bandwidth than a spinning disks could saturate.
July 15, 201213 yr Author If you're using spinning disks, no. A 4X slot has way more bandwidth than a spinning disks could saturate. I'm using WD green drives, so that answers it. Actually, another reason to add a third card is to keep on-board sata ports for EXSi datatores and adding drives through SNAP. I use SSD drives for these. Thanks mrow, that was fast!! :)
July 15, 201213 yr I'll confirm, you should not feel any any slowdown even with 8 mechanical disks on it.. Keep in mind the SASLP-MV8 is Gen 1 and the SAS2LP-MV8 is Gen 2. on your board, a SAS2LP-MV8 will still be running twice as fast as an older SASLP-MV8. I personally am running M1015's (PCIe V2 8X cards) in PCIe V2 4x slots and am still getting full disk speeds.
July 15, 201213 yr Author I'll confirm, you should not feel any any slowdown even with 8 mechanical disks on it.. Keep in mind the SASLP-MV8 is Gen 1 and the SAS2LP-MV8 is Gen 2. on your board, a SAS2LP-MV8 will still be running twice as fast as an older SASLP-MV8. I personally am running M1015's (PCIe V2 8X cards) in PCIe V2 4x slots and am still getting full disk speeds. Thanks Johnm, I'm actually following your post to build an ESXi server. I'm planing a built with the supermicro X9SCM-F-O board, E3-1240 Xeon and 3 SAS2LP-MV8 cards. daniel
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