Public bug reported: On a Bionic server (Cisco UCS C240 M5) with a MegaRaid controller (Cisco 12G Modular Raid Controller UCSC-RAID-M5), I can observe very slow writes on the RAID 10 device that was created. A simple test: dd if=/dev/zero of=out bs=1M count=100 Outputs a 35MB/s speed.
The RAID 10 is composed of 4 HDDs (TOSH MG04SCA60EA T0A0CAF8YC 6TB) was configured with the default settings [0]: Strip size: 64K Access Policy: RW Read Policy: Normal Write Policy: Writethrough IO Policy: Direct Disable BGI: No uname -a 4.15.0-48-generic #51-Ubuntu SMP [0] https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c/sw/raid/configuration/guide/RAID_GUIDE/MegaRAID.html ** Affects: linux (Ubuntu) Importance: Undecided Status: Incomplete ** Tags: bionic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1828351 Title: RAID 10 with MegaRaid controller gives poor write performance To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1828351/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
