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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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What is a RAID Controller's Sideband Cable used for?

I have some Adaptec SAS raid controllers and the fanout cable comes with an extra cable called a SideBand but I am curious what it does? I know it plugs into the backplane, but other than that I can't seem to find anything on google The adaptec site…
Chad Grant
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HDD: performance differences between 7.2k SATA and 15k SAS

What is the rule of thumb in performance characteristics and differences between 7200rpm (SATA/SAS) and 15000rpm (SAS) hard disc drives of the same generation?
cnst
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Improving SAS multipath to JBOD performance on Linux

I'm trying to optimize a storage setup on some Sun hardware with Linux. Any thoughts would be greatly appreciated. We have the following hardware: Sun Blade X6270 2* LSISAS1068E SAS controllers 2* Sun J4400 JBODs with 1 TB disks (24 disks per…
user36825
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Can we upgrade Dell's basic Server R240 (which still uses HDD 7200RPM) to an SSD?

Today I was shopping for the most basic dell rack server which is the R240. Ironically, they are still using HDD 7200 RPM, with no option for SSD in their selection; and we're approaching…
user1034912
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Why do servers have SAS instead of SSDs?

I was wondering why do servers still come with SAS disks instead of SSD disks? I know that SAS are faster than normal hard drives but they are still much slower than SSDs. I think they are more expensive too :s so what's the deal here?
katie
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Do SAS expanders work transparently with SAS controllers?

I'm new to SAS expanders and I'm trying to get things right. I understand that SAS expanders, when used with SAS controllers which supports expanders, allows you to utilise the full capacity of supported drives on a controller. However, say I've got…
sbrattla
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SAS or SATA for 3 TB drives?

We are looking to purchase new 3 TB enterprise-grade drives and can buy either SAS or SATA models. AFAIK, SAS generally gives better performance than SATA, but searching for benchmarks I found the article Seagate Constellation.2 and Constellation…
SyRenity
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Storage server - Swapping SAS HBA card for a different model

TL;DR Server's original SAS HBA (PCIe card) does not support transparent passthrough, which is desired, as I want the OS to manage the disks (ZFS). At my company, we have an Intel SSR212MC2 server (spec sheet) with SRCSAS144E RAID controller. The…
Nubarke
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Are branded backplanes useable without specific controllers?

I can't find a disk enclosure which I like, so I'm going to build a custom one (if nothing else, that'll teach me to be picky...). I've got a few HP SAS backplanes lying about, but I'm wondering if they would require the "right" (ie HP branded)…
carlpett
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Use of 2.5" Laptop Drives in a Server?

We're acquiring several 1U servers with (8) 2.5" drive slots. Although we can use either SATA or SAS, there is a large price variance as soon as you order 16 or 24 of these drives, so we are looking at the 2.5" SATA interfaced drives. I know that…
Anthony
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3Gbps SSDs in RAID1 VS 6Gbps SAS Drives in RAID1 - Performance Difference?

I have bought two Intel DC S4500 480 SSDs (comes with 5 year warranty) to use with a HP G7 DL360 1U Server in RAID1. Unfortunately after purchasing the disks, I figured out that the integrated P410i RAID Controller supports 6Gbps SAS but not 6Gbps…
Tonmoy
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SAS / SATA max number of connected disks vs performance

I would like to understand following things: When I have a motherboard with SATA 6Gb/s and 8 ports, does it mean that every single port is able to provide 6Gb/s speed to disk that is connected over SATA cable, or is 6Gb/s distributed evenly across…
Petr
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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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Can SAS drives be used with SATA controllers?

Can I buy SAS drives on my SATA Controller? What is the compatibility and restrictions about mixing these?
Jason
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