Date: Wed, 27 Jun 2012 12:15:10 +0300 From: Levent Serinol <lserinol@gmail.com> To: freebsd-fs@freebsd.org Subject: ZFS stalls on Heavy I/O Message-ID: <CACqg54Si-vHFAVkjpTS40MZt4E1Kn14kDUFKmVb8vx449fCnFw@mail.gmail.com>
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Hi, Under heavy I/O load we face freeze problems on ZFS volumes on both Freebsd 9 Release and 10 Current versions. Machines are HP servers (64bit) with HP Smart array 6400 raid controllers (with battery units). Every da device is a hardware raid5 where each one includes 9x300GB 10K SCSI hard drivers. Main of I/O pattern happens on local system except some small NFS I/O from some other servers (NFS lookup/getattr/ etc.). These servers are mail servers (qmail) with small I/O patterns (64K Read/Write). Below you can find procstat output on freeze time. write_limit is set to 200MB because of the huge amount of txg_wait_opens observed before. Every process stops on D state I think due to txg queue and other 2 queues are full. Is there any suggestion to fix the problem ? btw inject_compress is the main process injecting emails to user inboxes (databases). Also, those machines were running without problems on Linux/XFS filesystem. For a while ago, we started migration from Linux to Freebsd http://pastebin.com/raw.php?i=ic3YepWQ
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