Hello Christo, On Jan 31, 2010, at 4:07 PM, Christo Kutrovsky wrote:
> Hello All, > > I am running NTFS over iSCSI on a ZFS ZVOL volume with compression=gzip-9 and > blocksize=8K. The server is 2 core P4 3.0 Ghz with 5 GB of RAM. > > Whenever I start copying files from Windows onto the ZFS disk, after about > 100-200 Mb been copied the server starts to experience freezes. I have iostat > running, which freezes as well. Even pings on both of the network adapters > are reporting either 4000 ms or timeouts for when the freeze is happening. > > I have reproduce the same behavior with a 1 GB test ZVOL. Whenever I do > sequential writes of 64 Kb with compression=gzip-9 I experience the freezes. > With compression=off it's all good. > > I've also experienced similar behavior (short freezes) when running zfs > send|zfs receive with compression on LOCALLY on ZVOLs again. I think gzip in ZFS have a reputation being somewhat heavy on system resources, that said it would be nice if it did not have such a large impact on low level functions. Have a look in the archive, search for example death-spriral or Death-spriral revisited. Have you tried using the default compression algorithm also (lzjb, compresison=on)? Regards Henrik http://sparcv9.blogspot.com
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