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Questions tagged [sas]

Serial Attached SCSI (SAS) is a computer bus used to move data to and from computer storage devices such as hard drives and tape drives. SAS depends on a point-to-point serial protocol that replaces the parallel SCSI bus technology that first appeared in the mid 1980s in data centers and workstations, and it uses the standard SCSI command set.

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How do you connect more than 4 drives to a LSI 9361-4i MegaRAID controller?

I’m fairly new to proper hardware RAID having only used it in pre-built server machines before, but on the recommendation of some friends who work for datacentres I’ve bought an LSI 9361-4i MegaRAID controller to install into my main storage box at…
Benjamin Nolan
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SAS Expander backplane performance drops when more than 8 drives are active?

We are using an LSI 9211-8i raid controller (flashed in IT mode) in a PCI-e 2.0 x8 slot. It's connected to a supermicro SAS 836EL1 backplane with 1 SFF-8087 cable. We have 16 drives installed. When we do a 'badblocks' test of one disk performance is…
Jorne
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replace controller, add second controller, or use expander?

I have a Proliant DL380 G6 that I am re-purposing as a Hyper-V host for a new, off-site data center that will host our DR services. The server currently has a P410i controller with the 512MB BBWC module. The drives installed are SFF 6G 10K drives. I…
longneck
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ML350 G5 - upgrade hot swap drives to 6 Gb/s?

I support a non profit. They got an ML350 G5 donated to them and I immediately put it to good use for them :) It came with four HP 300GB 15K SAS drives - and of course, they have all now failed. I have been replacing the drives and they are all…
EricEE
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LSI 9285-8e and Supermicro SC837E26-RJBOD1 duplicate enclosure ID and slot numbers

I am working with 2 x Supermicro SC837E26-RJBOD1 chassis connected to a single LSI 9285-8e card in a Supermicro 1U host. There are 28 drives in each chassis for a total of 56 drives in 28 RAID1 mirrors. The problem I am running in to is that there…
Andy Shinn
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Will any SAS drive work in a Dell PowerEdge server?

If I bought a Dell 2950 or 2650, for example, and it has no drives in it (from say an auction). Will any SAS drive I get work in it? I ask because they vary so much in price. Some drives are $150 some are $500. I know they are faster more space,…
johnny
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HP ProLiant DL380 G7 LFF - Is every SAS HDD compatible?

I am just starting to get into server hardware, so please bear with me. I bought a HP ProLiant DL380 Generation 7 with a LFF drive cage and I do not know which SAS drives are actually compatible. Does every SAS drive work? In particular i found…
Sandrogo
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Performance differences between 2.5" vs. 3.5" SAS

What real performance gains/losses are there on 2.5" vs. 3.5" 15k SAS drives. Are folks really seeing seek differences, &c?
Jé Queue
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How to connect two Dell storage arrays to a to a Dell Poweredge server (daisy chain vs direct)?

I purchased two Dell MD1000 storage arrays together with a Dell Poweredge 1950 server and need help setting them up (I am a complete novice to SAN/iSCSI). The Poweredge server has two SAS SFF-8470 connectors. Should the two storage arrays (which…
Greg
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What is a maximum useful length of a SATA/SAS cable?

The server in question is DELL PowerEDGE SC1435. I am thinking about buying a LSI 1068e based card with two internal SFF-8087 ports. I intend to use the machine with external multiple hard disk enclosure as a ZFS based file server. I would connect…
SaleB
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Mixing dual and single port SAS disks

I have a HP DL380 G5 with 8x146GB single port SAS SSF disks (DG146ABAB4). A couple of them have failed and I can't find any new single port disks anymore. They all seem to be dual port. I'm wondering if I can mix the two disk types? Are dual port…
Garry Harthill
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Dell MD1000 and an x4 SAS connector throughput / layout

I'm trying to get my head around how a multi lane x4 SAS connector works in a DAS system such as the Dell MD1000. I understand that each lane is 3Gbps, and that multiple hard drives can share a lane. What I'm having trouble finding information on…
Eric C. Singer
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SAS Expanders for DIY JBOD Arrays

I am researching making a DIY SAS array much like the Dell MD1000. My understanding is that these devices do not contain a RAID controller, instead they present all the drives on in SAS domain to the host. I would like to build the same type of…
Jacob Groundwater
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Are 6Gb/s SAS drives compatible with 3Gb/s SAS interfaces?

Are SAS 3Gb/s controllers (SAS1) forward compatible with newer SAS2 drives specified at 6Gb/s? The controller I have in mind is an LSI SAS1064. I know that SAS2 controllers are backwards compatible with SAS devices. I found some information in this…
Ryan
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What are SAS external storage options (Promise, Infortrend, SuperMircro, ...)?

We are looking for a ~32T external storage solution for two 48-core AMD servers. These will be used for a small Linux OpenVZ cloud for CPU intensive web-servers and data warehousing. Dual path with automatic fail-over is pretty much a must.…
Aleksandr Levchuk
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