disk busy 100% 解决及调优 [复制链接]

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61楼 [报告]

发表于 2008-12-28 11:52 |只看该作者

回复 #57 Charlemagne 的帖子

mServer1/#fget_config -A -v

---dar0---

User array name = ''
dac2 ACTIVE dac3 ACTIVE

Disk    DAC LUN Logical Drive
utm          31
hdisk4 dac3 0 mail2-disk1
hdisk5 dac3 1 mail2-disk2
hdisk6 dac3 2 mail2-disk3
hdisk7 dac3 3 mail2-disk4
hdisk8 dac3 4 mail2-disk5
hdisk9 dac3 5 mail2-disk6

这个命令的含义我待会查查。。  存储方面我很菜
网上没查到详细解释 - -
能不能麻烦你讲细点。。怎么操作。。我把结果贴出来请你分析。

mServer1/#lsdev -C |grep hdisk
hdisk0       Available 03-08-00-5,0  16 Bit LVD SCSI Disk Drive
hdisk1       Available 03-08-00-8,0  16 Bit LVD SCSI Disk Drive
hdisk2       Defined 05-08-02    MPIO Other FC SCSI Disk Drive
hdisk3       Defined 05-08-02    MPIO Other FC SCSI Disk Drive
hdisk4       Available 06-08-02    1814    DS4700 Disk Array Device
hdisk5       Available 06-08-02    1814    DS4700 Disk Array Device
hdisk6       Available 06-08-02    1814    DS4700 Disk Array Device
hdisk7       Available 06-08-02    1814    DS4700 Disk Array Device
hdisk8       Available 06-08-02    1814    DS4700 Disk Array Device
hdisk9       Available 06-08-02    1814    DS4700 Disk Array Device
hdisk10       Available 05-08-02    MPIO Other FC SCSI Disk Drive
hdisk11       Available 05-08-02    MPIO Other FC SCSI Disk Drive
hdisk12       Available 05-08-02    MPIO Other FC SCSI Disk Drive

[ 本帖最后由 vanvesee 于 2008-12-28 17:49 编辑 ]

实战分享：从技术角度谈机器学习入门| 【大话IT】RadonDB低门槛向MySQL集群下战书 | ChinaUnix打赏功能已上线！ | 新一代分布式关系型数据库RadonDB知多少？

vanvesee

白手起家

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发表于 2008-12-28 11:54 |只看该作者

回复 #58 zlwww1227 的帖子

服务器参数配置什么的都没有变
既然主机部坚持说问题源自我们的应用
目前仅仅是从应用层进行优化
不过效果一般  待会我把这周的监控情况整理下发上来

一周的I/O wait% 平均仍为60%
只能说应用层的问题也排除了  这下不知道主机部的家伙会怎么说

[ 本帖最后由 vanvesee 于 2008-12-28 17:20 编辑 ]

实战分享：从技术角度谈机器学习入门| 【大话IT】RadonDB低门槛向MySQL集群下战书 | ChinaUnix打赏功能已上线！ | 新一代分布式关系型数据库RadonDB知多少？

Nikolai

丰衣足食

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63楼 [报告]

发表于 2008-12-30 13:46 |只看该作者

原帖由 vanvesee 于 2008-12-28 11:45 发表
mServer1/#ioo -a
      j2_atimeUpdateSymlink = 0
j2_dynamicBufferPreallocation = 16
         j2_inodeCacheSize = 400
         j2_maxPageReadAhead = 128
         j2_maxRandomWrit ...

可以考虑j2_nBufferPerPagerDevice=2048
# ioo -po j2_nBufferPerPagerDevice=2048

# ioo -h j2_nBufferPerPagerDevice
Help for tunable j2_nBufferPerPagerDevice:
Specifies the number of file system bufstructs for Enhanced JFS. Default: 512. File system must be remounted. This tunable only specifies the number of bufstructs that start on the paging device. Enhanced JFS will allocate more dynamically. Ideally, this value should not be tuned, and instead j2_dynamicBufferPreallocation should be tuned. However, it may be appropriate to change this value if, when using vmstat -v, the number of "external pager filesystem I/Os blocked with no fsbuf" increases quickly (and continues increasing) and j2_dynamicBufferPreallocation tuning has already been attempted. If the kernel must wait for a free bufstruct, it puts the process on a wait list before the start I/O is issued and will wake it up once a bufstruct has become available. May be appropriate to increase if striped logical volumes or disk arrays are being used.

一般来说, 对于磁盘阵列, 提高该值是有帮助的, 具体可以分析为
# vmstat -v |grep "external pager"
如果很busy的时候, external pager增加得很快, 你就有必要增加j2_nBufferPerPagerDevice.

另外, 从vmstat来看, memory应该是足够的.
当idle<10时, 线程一般是大于16, 而且user使用的cpu不高, 说明这个时候cpu都在忙于系统, 而不是在干活. 可以考虑优化应用, 减少线程. 当然io也是一个问题..