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Operating Systems Solaris What exactly does 'zpool iostat' measure? Post 302456483 by jlliagre on Friday 24th of September 2010 10:37:56 AM
Old 09-24-2010
You question seems to imply everything is written first to the ZIL which is incorrect. ZFS writes are usually asynchronous so are going straight to their destination. My understanding is 'zpool iostat -v' measures all read/writes to vdevs, regardless of what is written (metadata, zil, data, uberblock, ...). If you are using synchronous writes with no separated log devices, most of the data is written once too so the commits won't trigger a significant i/o load anyway.
 

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io_prep_pwrite(3)						       Linux							 io_prep_pwrite(3)

NAME
io_prep_pwrite - Set up iocb for asynchronous writes SYNOPSYS
#include <errno.h> #include <libaio.h> inline void io_prep_pwrite(struct iocb *iocb, int fd, void *buf, size_t count, long long offset); struct iocb { void *data; unsigned key; short aio_lio_opcode; short aio_reqprio; int aio_fildes; }; DESCRIPTION
io_prep_write is a convenicence function for setting up parallel writes. The first iocb->u.c.nbytes = count bytes of the file for which iocb->aio_fildes = fd is a descriptor are written from the buffer starting at iocb->u.c.buf = buf. Writing starts at the absolute position ioc->u.c.offset = offset in the file. This function returns immediately. To schedule the operation, the function io_submit must be called. Simultaneous asynchronous operations using the same iocb produce undefined results. RETURN VALUES
None. ERRORS
None. SEE ALSO
io(3), io_cancel(3), io_fsync(3), io_getevents(3), io_prep_fsync(3), io_prep_pread(3), io_queue_init(3), io_queue_release(3), io_queue_run(3), io_queue_wait(3), io_set_callback(3), io_submit(3), errno(3). Linux 2.4 2009-06-10 io_prep_pwrite(3)
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