Berkeley CSUA MOTD:Entry 34409
Berkeley CSUA MOTD
 
WIKI | FAQ | Tech FAQ
http://csua.com/feed/
2024/11/23 [General] UID:1000 Activity:popular
11/23   

2004/10/28-29 [Computer/SW/Unix] UID:34409 Activity:high
10/28   I just built a terrabyte raid server using linux. The distro is
        an older version of RH 8 (need it to keep compatibility with certain
        apps). I formatted the raid to be XFS. The server is an NFS server,
        and I appear to be hitting the 2 gig file limit. According to the
        docs I'm supposed to be able to get beyond the 2 gig limit with
        RH8. I have compiled a new 2.4.27 kernel to replace the stock
        RH8 kernel to be sure. Is this perhaps a limitation of the NFS
        server? How can I tell and do I just need to recompile the
        NFS utils and server? Isn't the server somehow integrated with
        the kernel now? Or is this a limitation of the filesystem? -williamc
        \_ I have no problem using ext3 and NFS with the 2.4.20-30.8
           kernel. My guess is your filesystem. Does it have a largefiles
           option? (I'm not familiar with xfs except on SGI.)
           \_ Well, it should. XFS is supposed to handle large files
              rather well. Other than dumping a 2+ gig file on the drive
              is there a way to tell if the underlying filesystem supports
              2+ gigs? I also heard that there may be libc issues. What
              libc version are you using?
              \_ The question is "Does it by default?". What's wrong with
                 dumping a 2+ gig file to the drive? That will provide your
                 answer. I am using glibc-2.3.2-4.80.6, if it matters.
                 \_ The fact that it's two gigs? Why apply hammer if you
                    can just figure it out by some setting? -williamc
        \_ Are you having trouble with a particular application?  does dd
           create a file that large?  I've had some problems with some
           applications that don't deal with the largeness correctly (apache,
           squid)
           \_ I'm having trouble with it in general. I would like it to work
              with NFS. The applications run on Sun machines, so no
              2 gig barrier on the apps. -williamc
        \_ I would stay away from XFS if you care about your data. The XFS
           fsck code will corrupt your data if you lose power during a
           journal replay. This can happen if you crash due to a power failure,
           the power comes back on, you start the recovery, and the power
           fails again. We just did a paper on this:
           http://keeda.stanford.edu/~junfeng/papers/osdi04.pdf
           --twohey.
                \_ And ext3 or reiserfs is better? -williamc
                \_ And ext3 or reiserfs is better?  BTW, I read your paper,
                   you guys didn't test XFS... -williamc
                \-i have not throughly read this over (yet) but any plans
                  to look at non-linux (AssOS) filesystems? I've been so
                  frustrated with linux i couldnt bring myself to participate
                  in this thread. ObAndrewHumeonAssOS
2024/11/23 [General] UID:1000 Activity:popular
11/23   

You may also be interested in these entries...
2011/9/14-10/25 [Computer/HW/Drives] UID:54173 Activity:nil
9/13    Thanks to Jordan, our disk server is no longer virtualized. Our long
        nightmare of poor IO performance should hopefully be over. Prepare for
        another long nightmare of poor hardware reliability!
        ...
        Just kidding! (I hope)
        In any case, this means that cooler was taken out back and shot, and
	...
2010/4/28-5/10 [Computer/SW/OS/Windows] UID:53807 Activity:nil
4/28    Win 3.1 was more widely adopted than Win 3.0.  Win XP (5.1) was more
        widely adopted than Win 2k (5.0).  Now it looks like Win 7 (6.1) is
        going to be more widely adopted than Vista (6.0).  Is this a trend on
        Microsoft x.0 versions being bad?
        \_ duh.
        \_ "more widely adopted" ... well... what are you basing these numbers
	...
2010/3/8-30 [Computer/SW/Unix] UID:53745 Activity:nil
3/8     I have a mod_rewrite question that I think should be straight-
        forward but I think I'm not getting something.
        I have a virtual server with some root, say /home/user/public_html/
        and in there I have two subdirs, say /app1/ and /app2/
        and i want the following:
        http://mysite/app1   -->   /home/user/public_html/app1
	...
2009/2/26-3/5 [Computer/SW/Unix] UID:52653 Activity:nil
2/26    If I want to rsync a perforce or svn directory while users
        are checking things in, could I wind up with a corrupted copy?
        \_ sure why not.  if you are really cool, your copy of the svn
           repo is on LVM, and you snap the LVM to copy it.
           \_ It'll seem less cool when you realize you've taken a snapshot
              of a block level device, which only guarantees that this set of
	...
2008/11/29-12/6 [Computer/SW/OS/FreeBSD, Computer/SW/OS/VM] UID:52129 Activity:moderate
11/29   I'm experimenting with virtualization, and as a poor college student
        I'm wondering what the best alternatives for virtualization are, and
        how best to cut my teeth on messing with non-linux platforms (or I
        guess interesting stuff on Linux would work too). Right now I've got
        FreeBSD7 running on KVM on my home computer (on a Core 2 Quad), and am
        somewhat at a loss as to how to use it. (More details: bridged
	...
2008/8/27-9/3 [Computer/HW/Laptop, Computer/SW/OS/Linux] UID:50980 Activity:nil
8/27    I have a rather large linux partition.  I just got a new laptop
        and want to move all my settings and customization to that new
        computer.  how to do this?  I tried remastersys but it seems that it
        get stuck somewhere, and I am hoping it is not really trying to create
        a 26GB iso file.
        any ideas?  is there anyway i can back up my debian package database
	...
2008/5/5-9 [Computer/SW/OS/Windows] UID:49885 Activity:moderate
5/5     Any recommendations for data recovery software for NTFS partitions?
        I have an NTFS partition that produces this error in linux:
          "ntfs_read_inode_mount(): Couldn't find first extent of $DATA attribute
           in attribute list. $MFT is corrupt. Run chkdsk"
        \_ Eh... I'd try it with a real windows box before assuming the
           partition is bad.  NTFS itself is pretty solid.  How old is the
	...


	...
2008/4/29-5/5 [Computer/SW/Languages/Perl, Computer/SW/Languages/Python] UID:49852 Activity:moderate
4/29    Scaling your web app in the real world:
        http://teddziuba.com/2008/04/im-going-to-scale-my-foot-up-y.html
        \_ This article is crap.  While yes, 99.9% of all websites don't
           need any serious scalability plans, if any of them become worth
           anything they will need to scale.  If you write a web application
           without careing about scalability you are writing a webapp that can
	...