On 9/23/11 9:43 AM, Eric Sandeen wrote: > On 9/23/11 4:52 AM, Andrey wrote: >> Thank you for reply, >> >> BTW, other webserver has almost the same bonnie results (10283ms and >> 5884ms) on ext3 partition with 45GB of data (1.5 millions of >> files)?! >> >> Hardware and RAID5(also hardware) are the same: HP Proliant DL380 G4 >> with SmartArray 6i controller (as I see it comes with 128MB BBWC >> enabler but not kit). >> >> I did not tried to mount fs with barriers disabled. Does it have any >> crititcal risks? > > Yes. If you have write caches on either the raid controller or on > the disks behind it which can be lost on a power outage, running > without barriers will potentially corrupt your filesystem if you lose > power, even though you have ext3's journaling. > > Journaling depends on write guarantees which are lost if drive > write caches evaporate. ... evaporate unexpectedly that is. barriers manage that cache. If write caches are battery-backed (or off), then nobarrier is safe. -Eric > -Eric _______________________________________________ Ext3-users mailing list Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
