![]() ![]() There are differences in the architecture of SSDs and regular hard disks: What do you have to consider when using SSDs? Therefore, our application benefits from the use of SSDs. Since SSDs are now available on both consumer and enterprise markets, let us have a look at the different features of this technology.Īlmost all data that are processed in BMD NTCS are located in a database and, as previously mentioned, one of the most important factors for databases is I/O performance. Very low, failure of two disks does not cause data loss Low, read performance good (~ RAID 5), write performance poor Low, failure of one disk does not cause data loss (security 1 + x) Number of disks minus 2 disks times capacity of the smallest single disk Number of disks minus 1 disk times capacity of the smallest single diskĪverage, read performance good, write performance moderateįile server, test system, archiving, backup to disk Low, failure of one disk does not cause data loss (security is 1 + x) Very high, read performance very good, write performance good Operating system, database, high I/O load Low, failure of one disk does not cause data loss High, read performance very good, write performance same as single disk Half the number of disks times capacity of the smallest single disk Very high, failure of one disk causes loss of all data Very high, excellent write and read performance Number of disks times capacity of the smallest single disk Overview of the most common RAID levels 4.1. RAID 0 - Striping distributing operating system, log files and databases to separate controllers and separate RAIDsĤ. separating sequential and random I/O data to different RAID controllers and RAID levels.considerably higher random read performance.can be used as a substitute for BBWC/FBWC.Using 2.5” disks - smaller disks have shorter access times.Neutral for sequential data (good for short bursts).Efficient RAID levels and the “right” number of hard disks.RAID controller instead of onboard controller.Optimization strategies for the disk subsystem When using one single SAS hard disk drive, random I/O performance is up to four times higher than when using a SATA drive (access time)! Moreover, a SAS hard disk drive can perform read and write operations at the same time (duplex mode)!ģ. Already, the advantage of an SSD over an HDD is readily apparent.Īs for operating databases, only random I/O performance is relevant. For the use of database-oriented applications like BMD NTCS, critical factors include IOPS and latency of the respective media. For SSDs interfaces NVMe (especially for servers) and M.2 (for consumers) can also be used.īefore addressing the differences of SATA and SAS interfaces, let us have a look at a speed comparison between an HDD and an SSD. In this article we focus on SATA and SAS for HDDs. SQL and Oracle) → BMD NTCS!īy now there are various interfaces which can be used to connect hard disks and SSDs. a hard disk or an SSD) process per second? However, we should bear in mind that there are other vital factors for good performance than data throughput (bandwidth). ![]() ![]() How much traffic/how many operations can a medium (e. When it comes to running BMD NTCS, one of the most important factors is IOPS performance (input/output operations per second). Moreover, it deals with the question why the use of SSDs leads to an increase in performance in BMD NTCS. This article provides an overview of the differences between the two interfaces SATA and SAS. The difference between SATA and SAS and the use of SSDs ![]()
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