Re: Very slow disk I/O

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]



On 2/2/2015 8:11 PM, Jatin Davey wrote:
disk 252:1 | 0-0-0 | 9XG7TNQVST91000640NS CC03 | Online, Spun Up
disk 252:2 | 0-0-1 | 9XG4M4X3ST91000640NS CC03 | Online, Spun Up
disk 252:3 | 0-1-1 | 9XG4LY7JST91000640NS CC03 | Online, Spun Up
disk 252:4 | 0-1-0 | 9XG51233ST91000640NS CC03 | Online, Spun Up
End of Output **************************

Let me know if i need to change or configure anything else to make the I/O a bit faster than what it currently does. I cannot go in for using SSD's due to budget constraints. Need to make the best use of the SATA disks that i have currently.

so, you have 2x2 ST91000640NS
http://www.seagate.com/products/enterprise-servers-storage/nearline-storage/enterprise-capacity-2-5-hdd/

those are "Nearline" disks, 7200RPM. They are intended for bulk secondary storage, archives, backups and such.

you said you have a number of virtual machines all attempting to access this raid10 at once? I'm not surprised that it is slow. You're probably limited by random IO/second, that raid likely does around 250 random operations/second. share that between 6-7 virtual systems and if they are all doing disk IO, they are going to slow down each other.




--
john r pierce                                      37N 122W
somewhere on the middle of the left coast

_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
http://lists.centos.org/mailman/listinfo/centos




[Index of Archives]     [CentOS]     [CentOS Announce]     [CentOS Development]     [CentOS ARM Devel]     [CentOS Docs]     [CentOS Virtualization]     [Carrier Grade Linux]     [Linux Media]     [Asterisk]     [DCCP]     [Netdev]     [Xorg]     [Linux USB]
  Powered by Linux