1. 只有asmlib包才支持4k的sector size,也就是说---udev方式的asm diskgroup 不支持4k的sector size
asmlib包的新特性: ORACLEASM_USE_LOGICAL_BLOCK_SIZE
该特性适用的asmlib版本和UEK内核版本:This new feature is available in oracleasm-support-2.1.8-1 and kernel-uek 2.6.39-400.4.0 or later.
New Block Size Feature for OracleASM and oracleasm-support (文档 ID 1530578.1)
详见文档Bug 18799063 - PGA memory corruption / errors with ASM on disks with blocksize > 512 bytes (文档 ID 18799063.8)
3. 检查disk 的block size的方法:
[root@node1 ~]# grep "" /sys/block/*/queue/*block_size /sys/block/nvme0n1/queue/logical_block_size:512 /sys/block/nvme0n1/queue/physical_block_size:512 /sys/block/sda/queue/logical_block_size:512 /sys/block/sda/queue/physical_block_size:512 /sys/block/sdb/queue/logical_block_size:512 /sys/block/sdb/queue/physical_block_size:4096 [root@node1 ~]#参考文章:
Using 4k Redo Logs on Flash and SSD-based Storage (文档 ID 1681266.1)
Supporting ASM on 4K/4096 Sector Size (SECTOR_SIZE) Disks (文档 ID 1630790.1)--------->>>请仔细阅读该文章提到的pdf.
CRS Not Able to Discover Voting Disk after Kernel and Module kmod-oracleasm Upgrade (文档 ID 1994371.1)---->>值得一读
http://mt.sohu.com/20160405/n443331874.shtml
