SAS vs SATA

SAS vs SATA: The Key Differences That You Should Know

SAS is an acronym for Serial Attached SCSI or Serial Attached Small Computer System Interface. And SATA is an acronym for Serial ATA or Serial Advanced Technology Attachment.

SAS and SATA connectors are used for connecting the components of the computer to motherboards, like hard drives and media drives. However, hard drives which are based on SAS are quicker as well as more reliable than the hard drives which are based on SATA. But, SATA drives offer significantly higher storage capacity. SAS drives are utilized for servers because they are fast and dependable, whereas SATA drives are utilized for personal computing and are less expensive.

In this blog, we will discuss about some differences between SAS vs SATA that are essential ones. So, before going deeper, Let’s start with a short introduction to each of these terms.

What is SAS Storage?

SAS (Serial Attached SCSI) is the recent evolution of the SCSI interface drives that are utilized in higher-end workstations and servers. Most current servers use HDD or SSD drives, just like consumer computers, but they’re quicker and more reliable.

Enterprises utilize it as the de facto standard (including EuroVPS).

Benefits / Advantages of SAS storage

1. Faster Throughput

SAS drives can read/write and process data in a fraction of the time it takes SATA drives, especially for random reads/writes and with the newest 12 Gbps disks and RAID hardware controllers. And at sequential data, SATA is a good one, but it is terrible at random IOPS.

2. Better suited to 24/7 workloads:

For servers, SAS is designed and frequently has 100% duty cycles. SAS is designed to read/write data every day, unlike SATA drives for your home desktop, which have 20-30% duty cycles.

Disadvantages of SAS Storage

1. Less storage capacity

SAS disks come in smaller size formats than SATA.

The following are the most common SAS storage sizes:

  • 73GB
  • 146GB
  • 300GB
  • 450GB
  • 600GB
  • 900GB
  • 1.2TB
  • 3.8TB

SATA is usually preferable for data archives, backups, or file storage, whereas SAS is better for production websites content.

2. SAS drives have a higher cost

SAS drives are around four times more costly than SATA drives. And the cost for the SAS enterprise starts at $1/GB, it’s simple to see why most hosts only provide SATA as a default option for dedicated servers.

3. Higher electricity consumption

SAS consumes more electricity than SATA. In comparison to a SATA or ATA disc, a SAS drive can need at least twice as much signaling voltage.

More electricity equates to higher operating expenses.

What is SATA Storage?

SATA (Serial ATA) is the recent evolution of the ATA hard drive. It is done in the 1990s and early 2000s and moreover, it is utilized in the PC desktop computers. Today’s PCs always come with SATA-II or SATA-III ports, and SSDs are becoming more common.

Benefits / Advantages of SATA storage

1. Cheaper than SAS

As compared to SAS drives, SATA drives are 75% less expensive. As a result, hosting companies provide more storage space at cheaper prices – or at a bigger profit margin.

Customers that have a dedicated server can take benefit of additional storage, such as backup drives.

2. Sequentially fast

SATA is excellent at writing in sequential order and it has a throughput of 6 Gbps and can write at that rate if no random reads/writes are present.

3. Good storage for infrequently-accessed data

SATA is ideal for file, picture, and video storage, as well as for backup snapshots. Because the writes/reads are primarily sequential, a big RAID-protected SATA-based array will work sufficiently.

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Disadvantages of SATA Storage

1. Bad random read/write performance:

Random read/write seek and storage delay are comparable to a racing car’s cornering abilities on a track.

Taking the bend is more difficult than going straight (sequential). And random read/write requests cause a SATA drive to crawl.

2. Uses the CPU

SAS has an enterprise-class data management system, whereas SATA does not. Data flow management is delegated to the CPU through SATA. As a result, disc I/O spikes have a significant influence on the system load average.

Customers who use shared hosting will notice the sluggishness of a SATA server the most since dozens or hundreds of clients use it at the same time. On the other hand, SAS employs command queuing, which is significantly quicker.

3. Lower MTBF

Lower is worse.

SATA drives have a shorter MTBF (mean time before failure) than SAS drives. 

At a relatively cool 25 °C, a standard SATA drive lasts 700,000 hours, whereas a SAS drive lasts 1.2 to 1.6 million hours at a warmed 45 °C.

4. Slower RPM

SATA is slower, which has an impact on performance.

You can read/write data quicker if a disc platter rotates faster.

At 5400-7200 rpm, consumer-level SATA operates, and enterprise-class SAS operates at 10000-15000 rpm. 

SAS vs SATA: In Tabular Form

Here you can see some differences between SAS vs SATA in tabular form.

Basis For ComparisonSASSATA
Stands ForSerial Attached SCSI / Serial Attached Small Computer System InterfaceSerial ATA or Serial Advanced Technology Attachment
UsesIt uses in enterprise, serversIt uses for personal computing, storage
SpeedIt is faster than SATA and data transfers at the rate of 6 Gb/s. Also, if the SAS connection of dual-port is used, transfer speeds will be 2 x 6 Gb/s.In SATA, the data transfers at the rate of up to 6 Gb/s
Speed over CapacityIn SAS, it prioritizes speed over the capacity.In SATA, it prioritizes capacity over speed.
Data cableSAS can be up to 10m (33ft) long, and the data and power are fused into one connections.It can be up to a meter (roughly 3ft) long, and the data and power are split into two connections.
PriceApprox. 100$Approx. 90$
ReliabilityIt can be used 24/7.After use for a long period, it may fail.
AdvantagesIts data transfer rate is fast. It has a higher MTBF than SATA, longer cables, and sometimes higher rpm.SATA is inexpensive and has a large storage capacity.
DisadvantagesIt is expensive and uses power to operate, and also it has less storage capacity. It has lower MTBF than SAS, and it is less suited for servers.

SAS vs SATA: The Key Differences

There are so many differences between SAS vs SATA, Let’s discuss some key differences:

Speed

The quantity of data that can be transferred, processed, or read and written in a certain length of time is referred to as throughput. Drive throughput is benchmarked or measured to determine drive speeds. SAS drives often have better throughput than SATA drives since there are fewer delays in general. However, in the slower SAS and faster SATA drives, there is some overlap between them. 

Throughput is affected by the number of rpm (revolutions per minute) that a drive can complete. Several factors impact the overall speed of the drive. Normally, the greater the rpm, the faster the drive’s throughput and other performance functions. Most SATA-based consumer drives operate at 5400 rpm and up to 7200 rpm, whereas most of the SAS-based drives operate at 7200 rpm and up to 15000 rpm.

When working with huge files, the difference in performance is most obvious. A 500GB file will most likely be read and written faster on a 15000 rpm SAS drive than on a 7200 rpm SATA drive.

In both SAS and SATA, the hard drives transfer rate of data is closely related to the connector type used. A SATA cable transfers the data at around 150 MB/s, compared to 300 MB/s for SATA-II and 600 MB/s for SATA-III. In contrast, SAS cables are used to transport data at up to 600 MB/s, while current versions can transfer data at up to 1500 MB/s.

Storage Capacity

SAS gives priority to speed over storage. As a result, the majority of SAS drives on the market have less than 500GB of hard disk space. Those with more than 500GB of storage capacity might be rather costly. 

On the other hand, SATA emphasizes storage; therefore, finding a cheap SATA drive with 1TB or more capacity is simple.

Reliability

SAS is built for 24/7 use in companies, such as datacenters, which is a key distinction between SAS and SATA. While SATA drive is used technically in the same way as a SAS drive and it would be slower and more likely to fail. Organizations that rely on trustworthy hard drives this is an expensive problem. A SAS drive’s MTBF (mean time between failures) is 1.2 to 1.6 million hours of use at 45 °C, whereas a SATA drive’s MTBF is 700,000 to 1.2 million hours at 25 °C.

A hard drive can live for years, regardless of the activities, it is used for. And the statistics of all the performance and reliability are based on a bell curve, with the performance of some drives better or worse than others. When looking for the most reliable drive, brand matters, whether it’s SAS or SATA. Backblaze, a backup service, examined the three common hard drive brands’ reliability in 2013, including Hitachi, Western Digital, and Seagate. Hitachi and Western Digital proved to be the most reliable, whereas over 30% of Seagate drives failed after usage of three years.

Power Consumption

If we talk about power consumption, SAS consumes more power than SATA, allowing for server backplane support and longer cables. The signaling voltage used by a SAS drive is at least double that of a SATA drive.

SAS vs SATA: Uses/Applications

Personal Computing

For personal computing, both SAS and SATA drives are used. And most small businesses and individuals will not employ the transmission capabilities of data daily. In almost all circumstances, sacrificing the storage space of a SATA drive, which normally offers at least twice the hard disc space of a SAS drive cost fraction, is not an adequate trade-off.

Servers

SAS is the preferable choice for delivering web pages on a web server or hosting games on a game server due to its low failure rate and high-speed data transfer capabilities.

Conclusion: SAS vs SATA

In this blog, we have discussed SAS vs SATA. And, for the students to understand the essential differences between the terms SAS vs SATA is very useful. And we hope that now you have got all the information related to SAS vs SATA. 

But if in any case, you want our SAS Assignment Help. Then, feel free to contact us. We are available 24*7 to help you.

FAQs Related To SAS vs SATA

What is better SAS or SATA?

SATA devices offer significantly higher storage capacity, and SAS-based hard drives are more reliable and quicker than SATA-based hard drives. And drives used for servers are SAS drives as they are fast and dependable. And SATA drives are used for home computers as they are less expensive.

Is SAS same as SATA?

Both technologies roughly do the same things. However, they are created on distinct hardware. SAS is more costly, and it’s better suitable for servers usage or workstations with a lot of processing power. SATA is less costly, and it’s better for storing files on a desktop.

Can a SAS drive be connected to SATA?

Both use the same infrastructure and have similar functionality, allowing SATA hard drives to be used with SAS controllers. SAS controllers allow SATA drives to be plugged in, whereas SAS drives can’t be plugged into the SATA controllers.

Why are SAS drives more expensive?

The SCSI storage protocol contains more advanced directives for improving data transmission from drives to controllers and vice versa. This boost in efficiency would make an otherwise identical SAS drive intrinsically quicker than a SATA drive, especially under heavy workloads; nevertheless, it would also raise the cost.

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