Robert Milkowski wrote:
Hello zfs-discuss,
A file system with a lot of small files.
zfs send fsA | ssh [EMAIL PROTECTED] zfs recv fsB
On a sending site nothing else is running or touching the disks.
Yet still the performance is far from being satisfactionary.
When serving data the same pool/fs can read over 100MB/s.
This is s10u3.
Maybe it's due that zfs send is single threaded and traversing lot
of small blocks just take a time and can't saturate underlying LUNs?
Yes, there are two problems:
1. as you noticed, zfs send only issues one read i/o at a time.
2. there are some inefficiencies with the way we process the files, so
that many small files is considerably slower than a few large files
(even with the same size and number of blocks)
We're working on these...
--matt
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