Author(s):
1. Bojan Škorić, Serbia
2. Nikola Davidović, Elektrotehnički fakultet, Univerzitet u Istočnom Sarajevu::, Republic of Srpska, Bosnia and Herzegovina
3. Slobodan Obradović, Elektrotehnički fakultet, Univerzitet u Istočnom Sarajevu::, Republic of Srpska, Bosnia and Herzegovina
4. Borislav Đorđević, Institut Mihajlo Pupin, Serbia
5. Valentina Timčenko, Institut Mihajlo Pupin, Serbia

Abstract:
Magnetic disks (HDDs) are still the basis for storing large amounts of data. On the other hand, the dimensions have practically reached their theoretical limits. The requirements that are set are largely contradictory: the higher the speed, capacity and reliability, the lower the cost of memorized information. By using arrays of independent (and cheap) paired disks (RAID) it is possible to largely meet all these requirements. There are several ways to implement RAID arrays, but in practice, they are mostly used: RAID 0 to increase the capacity and speed of reading and RAID 5 which additionally ensures data reliability and the possibility of recovery in the event of a single disk failure. In practice, their combination is also used: RAID 50. The characteristics of the arrays of paired disks depend on many parameters: the size of the array (N, number of disks), the size of the data block on the disk (Stripe Unit, SU), workload, workload Queue Depth, QD). Final performance depends on the setting of these parameters and in case of poor selection, a number of disks may have poorer performance than a single disk. The paper presents comparative characteristics of read and write data speeds for paired disk arrays: RAID 0, RAID 5 and RAID 50. Measurements of write and read speeds for all three types of RAID arrays were made for different sizes of data blocks on the disk (SU): very small 8KB, medium 64KB and very large 1MB.

Key words:
RAID 0, RAID 5, RAID 50, data block, workload, queue depth, array size

Thematic field:
SYMPOSIUM A - Science of matter, condensed matter and physics of solid states

Date of abstract submission:
03.08.2020.

Conference:
Contemporary Materials 2020 - Savremeni materijali

Final paper