Unsubscribing field-critical and marking as invalid. The main reason of
this was that bcache was not tuned automatically.
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1828351
Title:
RAID 10 with MegaRaid controller gives poor write performance
Status in linux package in Ubuntu:
Invalid
Bug description:
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
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