On 12/30/2013 7:19 AM, Roger Willcocks wrote: > > On 30 Dec 2013, at 01:55, Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> wrote: > >> On 12/29/2013 3:50 AM, Dave Chinner wrote: >> ... >>> I think you are forgetting that developer time is *expensive* and >>> *scarce*. This is essentially a solved problem: An SSD in a USB3 >>> enclosure as a temporary swap device is by far the most cost >>> effective way to make repair scale to arbitrary amounts of metadata. >>> It certainly scales far better than developer time and testing >>> resources... >> >> Now this is an interesting idea Dave. I hadn't considered temporary >> swap. Would USB be reliable enough for this? I've seen lots problem >> reports with folks using USB storage with Linux, random disconnections >> and what not. >> > > I'll just chip in here and mention that we get around this problem by > exporting the broken xfs volume over iscsi and run xfs-repair on another > machine with more memory / swap space. Another interesting, actually excellent idea Roger. So Arkadiusz could get by with just one set of SSDs. Pulling ~40 GB of metadata over GbE iSCSI should take only about 7 minutes of wire time, assuming his hosts/net can sustain 100 MB/s. -- Stan _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
