quick question – the xfs_freeze feature is really killer when one wants to do consistent snapshots/backup of database directories, etc. Is there anything similar in ext4 or is the benchmark of ext4 +lvm (which I know allows this) on par with xfs_freeze (without lvm) ?
Comment: How FLUSH TABLES WITH READ LOCK works with Innodb Tables
March 26, 2012 By 20 Comments
…. It might be related to Innodb itself or how XFS plays with LVM or something. As mark mentions – indeed there are known…
Post: SSD, XFS, LVM, fsync, write cache, barrier and lost transactions
March 2, 2009 By 32 Comments
… bad, we have no good replacement yet) and I tried LVM under XFS. With write-cache ON and default mount options (i… writes / s, this is because LVM ignores write barriers (see http://dammit.lt/2008/11/03/xfs-write-barriers/ ), but again with… what is good ones – another are for research 4. XFS without LVM is putting barrier option which decreases write performance a lot
Comment: Is your server's performance about to degrade?
May 19, 2010 By 13 Comments
Baron, I decided against XFS (picking JFS) for our servers when I bumped into these … XFS ‘without hesitation’ I thought I’d ask: Have you ever (more recently) run into problems like those two bugs with XFS/LVM/MD? Or is it that I should just give up on LVM for my db-servers…
Post: RAID vs SSD vs FusionIO
May 1, 2009 By 17 Comments
… the same from previous posts (100W, buffer_pool 3GB). Filesystem – XFS mounted with nobarrier option. Graphical results are here and average… my post http://www.mysqlperformanceblog.com/2009/03/02/ssd-xfs-lvm-fsync-write-cache-barrier-and-lost-transactions/). While results for…
Comment: Fast storage: 8 SSD Intel X-25M 80GB benchmarks
January 19, 2010 By 15 Comments
… mean this: http://www.mysqlperformanceblog.com/2009/03/02/ssd-xfs-lvm-fsync-write-cache-barrier-and-lost-transactions/ http://www.mysqlperformanceblog…
Comment: Fast storage: 8 SSD Intel X-25M 80GB benchmarks
January 19, 2010 By 15 Comments
… mean this: http://www.mysqlperformanceblog.com/2009/03/02/ssd-xfs-lvm-fsync-write-cache-barrier-and-lost-transactions/ http://www.mysqlperformanceblog…
Post: Aligning IO on a hard disk RAID – the Benchmarks
June 9, 2011 By 11 Comments
… added LVM on top however, I made the logical volume slightly below 1TB. Investigating this I found that 32-bit xfs inodes… still be unaligned, though xfs defragmentation may be able to fix that (not verified). 6. Added LVM on top of aligned partition…. Neither IO alignment nor file size made any difference. Adding LVM here reduced single-thread performance by 5-10%. Sequential write…
Comment: Disaster: LVM Performance in Snapshot Mode
February 9, 2009 By 55 Comments
… traditional filesystems use COW technology on various levels – volume manager (LVM, VXVM) or in the filesystem (VxFS). If you use LVM snapshots the choice of the filesystem can be quite important. … “randomio” benchmark on ext3 filesystem and compared it with xfs. The difference with LVM snapshot is big. “randomio” opens its target with…
Post: Aligning IO on a hard disk RAID – the Theory
June 9, 2011 By 15 Comments
… size, here’s how we would create the file system: xfs – mkfs.xfs -b 4k -d su=64k,sw=5 /dev/ice… point. Let’s get down one more level: LVM If you are using LVM, you want to make sure it does not… in the process when using pvcreate to initialize disk for LVM use, the two options you are interested in are –dataalignment…
