- Work: Measuring the performance of a RAID 1 series of SSDs

Measuring the performance of a RAID 1 series of SSDs

1. Nikola Davidović, Elektrotehnički fakultet, Univerzitet u Istočnom Sarajevu::, Republic of Srpska, Bosnia and Herzegovina
2. Slobodan Obradović, Elektrotehnički fakultet u Istočnom Sarajevu, Republic of Srpska, Bosnia and Herzegovina

Of all the RAID arrays, RAID 0 and 1 are the most widespread. With falling prices and mass production, SSDs have become very affordable for the average user as well. Thanks to this, this RAID combination often finds its application even on home computers. There are several reasons: they are the simplest, cheap to implement, they can work with at least 2 devices, they are not too complex to understand, set up and use, and they also give very concrete and usable results. RAID 0 applies striping, and RAID 1 applies mirroring. While RAID 0 does not provide any data protection in the event of a device failure, RAID 1 ensures data integrity. Namely, data is written to two or more SSD devices at the same time, which directly affects the performance of the array in relation to the characteristics of one SSD device. Namely, the total capacity of the array is equal to the capacity of one device and theoretically, it is expected that there will be no reduction in write speed, but it is expected to double or multiply (depending on the number of disks in RAID) a higher read speed. It is possible to read different blocks of data from independent devices in RAID at the same time. In case of failure of one SSD device, copies of all data exist and after replacing the defective device with a new one, a copy of the data is restored on it. System performance depends on parameter settings. RAID 1 was implemented through SSD disks and write and read speeds were measured depending on the size of the strip block, the size of the workload, and the queue depth.

Key words: RAID 1; data integrity; write speed; read speed; stripe unit; workload size; queue depth

Thematic field: SIMPOZIJUM A - Nauka materije, kondenzovane materije i fizika čvrstog stanja

Date: 03.07.2020.

Contemporary Materials 2020 - Savremeni Materijali

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