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.
Questions tagged [sas]
502 questions
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2 answers
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…
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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?
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cnst
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10
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1 answer
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
9
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5 answers
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…
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user1034912
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9
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3 answers
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?
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katie
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2 answers
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…
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sbrattla
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9
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5 answers
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…
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SyRenity
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8
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2 answers
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…
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Nubarke
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2 answers
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)…
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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…
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Anthony
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3 answers
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…
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Tonmoy
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3 answers
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…
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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…
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Benjamin Nolan
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3 answers
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…
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Jorne
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7
votes
3 answers
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?
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Jason
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