/sys/block/sdc linux,disable,sata,ncq,performancethis,disabling,libata,noncq,kernel,queue,depth,doesn,sdc,officebox,echo,sys,queue_depth,errors,indicate,dmesg,relating,centos,login,console,ssh,immediatelyin,initial,install,rsync,preserving,ownership,permissions,raid,partition,booted,selinux,pam_unix,user,uid,drdy,err,icrc,abrt,fpdma,queued,mcp,ata,swncq,mode,qc,qc_active,sactive,defer_bits,last_issue_tag,dhfis,dmafis,sdbfis,ata_reg,err_reg,exception,emask,sact,serr" />
- rtt - IT Resource
This is the closest way to disabling it without using the "libata.force=noncq" kernel boot option is to set the queue to a depth of 1 which doesn't actually disable it.
Change the sdc below to match the device you want to disable NCQ for.
[root@officebox ~]# echo "1" > /sys/block/sdc/device/queue_depth
Errors that indicate you are having a performance issue are these in messages or dmesg relating to N........
In my case I could login with the initial install but I rsync'd everything over while preserving ownership and permissions to another RAID partition and booted from that.was fine before. The problem is that you are kicked out the second you login and the problem was SELINUX for some reason (perhaps it noticed something strange when it was moved to the new partition)
login: pam_unix(login:session): session opened for user root by LOGIN(uid=0)
login: ROOT LOG........
[ 2868.041375] ata1: EH in SWNCQ mode,QC:qc_active 0x40 sactive 0x40
[ 2868.041554] ata1: SWNCQ:qc_active 0x40 defer_bits 0x0 last_issue_tag 0x6
[ 2868.041556] dhfis 0x40 dmafis 0x40 sdbfis 0x20
[ 2868.041874] ata1: ATA_REG 0x41 ERR_REG 0x84
[ 2868.042013] ata1: tag : dhfis dmafis sdbfis sactive
[ 2868.042163] ata1: tag 0x6: 1 1 0 1
[ 2868.042301] ata1.00: exception Emask 0x1 SAct 0x40 SErr 0x400000 action 0x6 frozen
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