Oracle Solaris ZFS File System (MOSC)

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Actual block read/write size per iop

edited Jul 17, 2018 5:12AM in Oracle Solaris ZFS File System (MOSC) 1 commentAnswered

Hi.

I was asked by out storage team to investigate "problem" with writes on our LUNs.

We're running Oracle DB on Solaris 11.3 and ZFS.

Everything is OK, but we're occuring problems with performance and redo is pointed as a source of our problems.

Storage teams points over 600KiB/IO writes. Other pools (for data, undo, arch etc) are not facing this kind of issue.

ZFS recordsize=128K on redo.

redo poll has log devices and logbias=latency and primary/secondarycache=all.

In /etc/system:

set zfs:zfs_prefetch_disable=1

set zfs:zfs_nocacheflush=1

Our DBA's says they cant control write/read block size (IDK, I'm not DBA).

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