SSD 因 NCQ hang，failed command: WRITE FPDMA QUEUED / tag 28 ncq 4096 out

最新推荐文章于 2024-02-26 14:53:35 发布

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最新推荐文章于 2024-02-26 14:53:35 发布

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原文链接：https://yq.aliyun.com/articles/15216

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在CentOS 7.2上，使用PostgreSQL的fsync测试工具时，SSD出现IO hang。问题与NCQ（Native Command Queuing）相关，建议关闭NCQ以提高稳定性。NCQ是为提升硬盘性能而设计的技术，但对SSD可能无效。解决方案包括在启动项中禁用NCQ或针对不同硬盘类型调整queue_depth。若同时拥有机械盘和SSD，可能需要代码修补以区别处理。

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新购入的建兴ZETA 256G，在CentOS 7.2中，用PostgreSQL自带的fsync测试工具pg_test_fsync测试IOPS时，突然IO hang住了。

dmesg报了一堆这样的超时：

         res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  895.604149] ata1.00: status: { DRDY }
[  895.606940] ata1.00: failed command: WRITE FPDMA QUEUED
[  895.609389] ata1.00: cmd 61/08:e0:38:bd:06/00:00:00:00:00/40 tag 28 ncq 4096 out
         res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  895.614144] ata1.00: status: { DRDY }
[  895.616516] ata1.00: failed command: WRITE FPDMA QUEUED
[  895.618665] ata1.00: cmd 61/10:e8:00:90:06/02:00:00:00:00/40 tag 29 ncq 270336 out
         res 40/00:01:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  895.622940] ata1.00: status: { DRDY }
[  895.625089] ata1.00: failed command: WRITE FPDMA QUEUED
[  895.627236] ata1.00: cmd 61/00:f0:00:8c:06/04:00:00:00:00/40 tag 30 ncq 524288 out
         res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[  895.631176] ata1.00: status: { DRDY }
[  895.633133] ata1: hard resetting link
[  895.937682] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[  895.940816] ata1.00: ACPI cmd ef/10:03:00:00:00:a0 (SET FEATURES) filtered out
[  895.940830] ata1.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) filtered out
[  895.941234] ata1.00: ACPI cmd ef/10:03:00:00:00:a0 (SET FEATURES) filtered out
[  895.941243] ata1.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) filtered out
[  895.941314] ata1.00: configured for UDMA/133
[  895.941356] ata1.00: device reported invalid CHS sector 0
[  895.941362] ata1.00: device reported invalid CHS sector 0
[  895.941366] ata1.00: device reported invalid CHS sector 0
[  895.941369] ata1.00: device reported invalid CHS sector 0
[  895.941374] ata1.00: device reported invalid CHS sector 0
[  895.941377] ata1.00: device reported invalid CHS sector 0
[  895.941381] ata1.00: device reported invalid CHS sector 0
[  895.941384] ata1.00: device reported invalid CHS sector 0
[  895.941388] ata1.00: device reported invalid CHS sector 0
[  895.941392] ata1.00: device reported invalid CHS sector 0
[  895.941395] ata1.00: device reported invalid CHS sector 0
[  895.941399] ata1.00: device reported invalid CHS sector 0
[  895.941403] ata1.00: device reported invalid CHS sector 0
[  895.941408] ata1.00: device reported invalid CHS sector 0
[  895.941434] ata1: EH complete

现象和网上描述的类似，很多SSD有这样的问题。

https://bugzilla.kernel.org/show_bug.cgi?id=15573