reiser4 - slow copying to USB drive
Hello, I encountered another problem which seems to be related to flushing: When there runs an application which does very little but contiguous writes (like bittorrent client), copying from disk to a thumb drive fills the memory with the data to be written to fat32 fs, and it seems that the memory pressure causes the reiser4 writes to be flushed immediately, which results in a huge slowdown. In my case the thumb drive is able to write about 10MB/s, but after a while, when the RAM fills up, the speed drops to 3MB/s, because the hard drive is busy writing. Regards, -- Jindrich Makovicka
Re: reiser4 resize
Hello On Tuesday 19 September 2006 05:12, Jack Byer wrote: Short summary: Will a resize program for reiser4 be available within the next six months? Currently nobody works on that. So, I guess it is not very likely that reiser4.resize will be created within next six months. Long explanation: I use a 3ware SATA raid card for the main storage on my home network. I currently have 8 250 GB drives in a raid 5 + hot spare configuration. I chose this card because it allows for online capacity expansion. My plan was to wait until a few generations of hard drives emerged then upgrade them one at a time in cycles. This way my storage will periodically expand without any major downtime. When I first created the filesystem, there was a reiser4 resize program. This is no longer the case. that was not a working program. I've began my next upgrade cycle with the purchase of two 750 GB drives. I plan to buy one each month until all eight are replaced. Now I need to make a decision. Do I backup my raid onto the new drives and reformat my raid with another filesystem (xfs, reiser3, jfs), or do I put these new drives into the array and assume that when the time comes to resize the filesystem that a working program will exist? I think you should change to a filesystem which has resize.
Re: reiser4 resize
Vladimir V. Saveliev wrote: Hello On Tuesday 19 September 2006 05:12, Jack Byer wrote: Short summary: Will a resize program for reiser4 be available within the next six months? Currently nobody works on that. So, I guess it is not very likely that reiser4.resize will be created within next six months. Not even an expand? I know a shrink depends on a working repacker (even an offline one), but I'd think expanding it would be simple enough, so long as there's a big warning of You cannot undo this (can't shrink)! When I first created the filesystem, there was a reiser4 resize program. This is no longer the case. that was not a working program. Yes, I remember that, it was a stub. I think you should change to a filesystem which has resize. Alternately, how much would it cost to implement basic resizefs.reiser4? There are other reasons that make me wish I'd stayed away from reiser4 for awhile. Mainly, right now, I need a repacker, and the system seems to have become absurdly slow when it's fragmented. When I have over a gig of RAM free (not even buffer/cache, but _free_), and am trying to download anything over BitTorrent, even if it's less than 200 megs, the disk thrashes so badly that the system is really only usable for web and email. Even movies will occasionally stall when this is happening, and by occasionally, I mean every minute or so. I believe there was a patch to address the thrashing, so I'm eagerly awaiting 2.6.18, but the lack of a repacker bothers me.
Re: reiser4 resize
that was not a working program. I never looked too far into that issue, because I didn't need it back then. I think you should change to a filesystem which has resize. I guess this means that I'll won't use reiser4 again until 2 TB drives come out and I upgrade. Maybe by then reiser4 will be included in the kernel and files-as-directory will work :)
