Date: Mon, 2 Apr 2012 22:39:15 +0400 From: Sergey Kandaurov <pluknet@gmail.com> To: "bsalinux@gmail.com" <bsalinux@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: Swap on ZFS / swap_pager: indefinite wait buffer Message-ID: <CAE-mSOKqdT=-v9btkBrknuLXNEmmXHpLeHXLOTCcmV4u00toHQ@mail.gmail.com> In-Reply-To: <CAB3Sx6f66QoT1jWY2eSxrB43X%2BSigTxEahTXL6ZGK8fFgSGHEQ@mail.gmail.com> References: <CAB3Sx6f66QoT1jWY2eSxrB43X%2BSigTxEahTXL6ZGK8fFgSGHEQ@mail.gmail.com>
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On 2 April 2012 22:13, bsalinux@gmail.com <bsalinux@gmail.com> wrote: > Hi, > > I have been running FreeBSD 9.0-RELEASE from a USB stick running ZFS. > I have created swap file on zfs volume using the md driver. > > Swapinfo shows > > Device =A0 =A0 =A0 =A0 =A01K-blocks =A0 =A0 Used =A0 =A0Avail Capacity > /dev/md0 =A0 =A0 =A0 =A0 =A04194304 =A0 =A0 =A0 =A00 =A04194304 =A0 =A0 0= % > > > The system has hung twice and all I can find in the log is > > Mar 22 03:17:30 server kernel: swap_pager: indefinite wait buffer: > bufobj: 0, blkno: 927, size: 4096 > Mar 23 09:00:26 server kernel: swap_pager: indefinite wait buffer: > bufobj: 0, blkno: 55, size: 4096 > Mar 23 22:01:26 server kernel: swap_pager: indefinite wait buffer: > bufobj: 0, blkno: 49, size: 4096 > Mar 24 04:00:38 server kernel: swap_pager: indefinite wait buffer: > bufobj: 0, blkno: 60, size: 4096 > That generally means that your storage is too slow (to handle swap). See also FAQ: http://www.freebsd.org/doc/en/books/faq/troubleshoot.html#INDEFINITE-WAIT-B= UFFER > As the swap is on zfs, I assume it is not failing. > > Do I need to move swap off of ZFS? > IIRC swap on ZFS is generally a bad idea. Search web for bad stories. --=20 wbr, pluknet
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