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Hi, I am trying to educate myself on prefetching/readahead algorithm for Lustre''s read. For a starter I only have two simple questions. 1 - Does Lustre detect linear or random I/O pattern or it always triggers readahead? 2 - If readahead is triggered, how many pages are read in addition to what is necessary? Thanks, Arifa.

Hello! I need to write a user space tool that can dump logical block addresses used by every file in a ext3 file system. For example, if file foo uses LBAs 2,3 and file bar uses LBAs 100,102,156, then the ouptut should read: FILENAME LBAs foo 2, 3 bar 100,102,156 Is there a tool that exists that can do this? If not, what would be a good strategy to write this tool. I am

Hi! Is there a way to view ext3 filesystem's maintained journal (in a human-readable-format)? I ask, because i have had a server crash before and now i'm wondering if i might take a look at last things that my server did straight before crash. I guess clarifying log insertions might be lost before buffers were flushed to disk. Thx.

I need to find out what the maximum file size in an ext2/3 file system. It appears from the definition of the ext2_inode structure that since the i_size field is a 32 bit integer that the file would be limited by that. Thanks, Jason

* Andreas Dilger <adilger@dilger.ca> hat geschrieben: > You can see in the ext4 superblock the amount of data that has been > written to a filesystem over its lifetime: > > Note that this number isn't wholly accurate, but rather a guideline. Is is more like a completely bogus value at best:...

Could someone tell me what could be causing this failure on my system and a way to get around/fix it? Your help is very much appreciated. I'd just finished running lvm lvextend. "lvextend -L+L1G /dev/VolGroup00/LogVol00", after adding a new 1G partition (/dev/sda4) to /dev/VolGroup00. [root at ppstest13 ~]# ext2online -d -v /dev/VolGroup00/LogVol00 ext2online v1.1.18 -

...dev/{mdtdev} | grep ''Inode count''" on the MDT. If there are issues with privacy, please email me directly. Otherwise, I think people would be interested to know what the larger MDT sizes are (even if they aren''t as high as 2B inodes). Cheers, Andreas -- Andreas Dilger Sr. Staff Engineer, Lustre Group Sun Microsystems of Canada, Inc.

...dev/{mdtdev} | grep ''Inode count''" on the MDT. If there are issues with privacy, please email me directly. Otherwise, I think people would be interested to know what the larger MDT sizes are (even if they aren''t as high as 2B inodes). Cheers, Andreas -- Andreas Dilger Sr. Staff Engineer, Lustre Group Sun Microsystems of Canada, Inc.

Hi All, I am trying to read group descriptor from disk. I am able to read the superblock structure successfully. But I am not getting successful to get the group descriptor. Here is my code. Please check out what is missing. #include<linux/ext3_fs.h> #include<sys/types.h> #include<sys/stat.h> #include<stdio.h> #include<unistd.h> #include<fcntl.h>

Andreas, why is it relevant only in case of RAID5 or RAID6? regards, Martin On Fri, Mar 7, 2014 at 5:57 PM, Andreas Dilger <adilger@dilger.ca> wrote: > Note that stride and stripe width only make sense for RAI-5/6 arrays. > For RAID-1 it doesn't really matter. > > Cheers, Andreas > >> On Mar 6, 2014, at 13:46, Martin T <m4rtntns@gmail.com> wrote: >> >> Hi, >> >&...

hello, does lustre support OSD T10 standard? Can it be used with IBM''s/Intel''s OSD initiator and target? Thanks, Ashish -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.lustre.org/pipermail/lustre-discuss/attachments/20071128/c2de31a6/attachment-0002.html

Are we likely to see patches to allow 16TB ext3 in the mainstream kernel any time soon? I am working with a storage box that has 16x750GB drives RAID5-ed together to create a potential 10.5TB of potential storage. But because ext3 is limited to 8TB I am forced to split into 2 smaller ext3 filesystems which is really cumbersome for my app. Any ideas anybody?

Will lustre-1.5.95 build with 2.6.18-vanilla kernel? Which_patch doesn''t contain this kernel but I could see them in the series files. Do somebody have experience in building the same? I tried to do it but lot of errors after applying the patches in 2.6.18-vanilla series. Thanks, Venkat

...d code-specific discussions on lustre-devel, and the usage questions and general discussion on lustre-discuss. I think we all agree that maintaining the quality of the Lustre codebase going forward is important to everyone, so I hope we can have a productive discussion. Cheers, Andreas -- Andreas Dilger Lustre Technical Lead Oracle Corporation Canada Inc.

...d code-specific discussions on lustre-devel, and the usage questions and general discussion on lustre-discuss. I think we all agree that maintaining the quality of the Lustre codebase going forward is important to everyone, so I hope we can have a productive discussion. Cheers, Andreas -- Andreas Dilger Lustre Technical Lead Oracle Corporation Canada Inc.

...d code-specific discussions on lustre-devel, and the usage questions and general discussion on lustre-discuss. I think we all agree that maintaining the quality of the Lustre codebase going forward is important to everyone, so I hope we can have a productive discussion. Cheers, Andreas -- Andreas Dilger Lustre Technical Lead Oracle Corporation Canada Inc.

...ne so it is more specific > than "Re: Contents of Ext3-users digest..." > > > Today's Topics: > > 1. User space tool to extract ext3 inode information > (Aravindan Raghuveer) > 2. Re: User space tool to extract ext3 inode information > (Andreas Dilger) > 3. Re: User space tool to extract ext3 inode information > (Aravindan Raghuveer) > 4. [About kjournald] (Forrest Wang) > > > ---------- Forwarded message ---------- > From: Aravindan Raghuveer <aravindan_raghu at yahoo.com> > To: ext3-users at redhat.com &g...

I want to have a lustre client running on a system with 2.6.23.12 kernel. (The reason is that there is a special patch that is required for these 60+ Quad-Core AMD Opteron systems that we have and the patch is currently only available for this 2.6.23.12 kernel). Does anyone have a recommendation of how I should get a client and then a compatible server? For the server, we only need minimal

...for small or unaligned writes. Cheers, Andreas > On Mar 7, 2014, at 19:23, Martin T <m4rtntns@gmail.com> wrote: > > Andreas, > > why is it relevant only in case of RAID5 or RAID6? > > > regards, > Martin > >> On Fri, Mar 7, 2014 at 5:57 PM, Andreas Dilger <adilger@dilger.ca> wrote: >> Note that stride and stripe width only make sense for RAID-5/6 arrays. >> For RAID-1 it doesn't really matter. >> >> Cheers, Andreas >> >>> On Mar 6, 2014, at 13:46, Martin T <m4rtntns@gmail.com> wrote: >>&...

...t at lists.lustre.org You can reach the person managing the list at lustre-discuss-owner at lists.lustre.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Lustre-discuss digest..." Today''s Topics: 1. Re: OSS not healty (Andreas Dilger) 2. Re: e2scan for backup (Andreas Dilger) 3. Howto map block devices to Lustre devices? (Chris Worley) 4. Re: e2fsck mdsdb: DB_NOTFOUND (Aaron Knister) 5. Re: e2fsck mdsdb: DB_NOTFOUND (Karen M. Fernsler) 6. Re: Howto map block devices to Lustre devices? (Klaus Steden) -----------...