Enterprise SAS disks are your fastest and most resilient rotating media available at 10,000 and 15,000 RPM. Performance-optimized; Nearline or Midline SAS are usually mechanically-equivalent to 7,200 RPM SATA disks, but feature a SAS interface and offer the benefits of the SAS protocol. They are available in higher capacities than enterprise ...

2013年6月6日 · Expand your thinking beyond the "either Capacity or Performance" debate. Many of the storage manufacturers are moving toward a tiered storage solution mixing SSD, SAS, SAS-MDL/SATA. Most critical and frequently accessed data resides on the faster tiers, less accessed moved to lower tiers of storage.

Interface (SAS vs SATA) doesn't impact these numbers meaningfully. The RPMs are what determine the performance. Sequential I/O performance is a different number, but most server I/O these days is significantly random. As you can see, the performance difference between the two tiers of speed can be quite significant.

2015年3月20日 · SAS 10K 140 IOPS 198 MB/sec SATA 7.2K 75 IOPS 134 MB/sec When you look at transfer rate of disk it seems like just 48 SAS HDDs will saturate stack SAS ports. 48 * 198 = 9504 MB/sec. But majority of enterprise applications works with small block size (4KB, 8KB). And they are more sensitive to IOPS performance and latency.

Yes, we are thinking about NL-SAS - but as from my understanding, that is a SATA Drive with a SAS Interface. So it has some benefits - but the drive mechanics are the same. We are talking about 6-12 hard drives per server - more for the backup machine - the backup machine would be really impossible with SAS - but it is only for backup and must ...

2017年9月21日 · NL-SAS is basically a SAS disk with SATA construction (rotational speed and capacity) - it has a SAS interface and SCSI command set. As for 2-way mirrored Storage Spaces and SAS/SATA drives, everything depends on your needs. Performance wise - SAS drives, capacity - SATA.

2014年4月3日 · What is the expected performance difference in a storage backend scenario that is heavily parallellized in access (like a SAN, Virtualization host storage etc.) between SAS and SATA, all other things being equal? I Think it runs down to the impact of NCQ (32 command limit) to the MUCH higher oustanding command limit of SAS discs.

SAS uses higher signalling voltages than SATA so mixing those on the same backplane isn't the best of ideas, although you can get SATA interposer cards to allow SATA to be used on the same backplane. Near line SAS however uses a proper SAS interface so there should be no issue with your intended setup even if you put them all on the SAS 5iR.

But, to answer your question specifically, no you cannot connect a NL-SAS disk to a SATA controller. To answer some of the other post here, many controllers will allow you to connect SATA disks to a SAS controller, but many raid cards will not let you mix SAS and SATA in a virtual disk pool - NL-SAS could, but at possibly a significant ...

2014年12月18日 · I've been tasked with building some large storage and i'm first working to expand my SAS knowledge. As i consider transfer bottlenecks and SAS speeds, i can't help but wonder how 12 Gb/s SAS equates to 4800 MB/s of transfer. From a pure conversion standpoint those numbers don't equate, so i assume it has to do with theoretical vs actual speeds?