Hi, W dniu 12 lutego 2011 23:19 użytkownik Ric Wheeler <rwheeler@xxxxxxxxxx> napisał: > On 02/12/2011 05:12 PM, Michał Piotrowski wrote: >> >> Hi, >> >> I added a disc to my box. I wanted to use ext4. I run fs_mark to test >> speed, to my surprise I heard a really strange noises. >> >> It's very strange because the drive is new >> 9 Power_On_Hours 0x0032 100 100 000 Old_age >> Always - 12 >> >> >> # fs_mark -d test/ >> [..] >> FSUse% Count Size Files/sec App Overhead >> 0 1000 51200 22.8 54347 >> >> I decided to create an ext3 file system on this drive and everything works >> fine. >> >> # fs_mark -d test/ >> [..] >> FSUse% Count Size Files/sec App Overhead >> 0 1000 51200 103.7 57229 >> >> When I mount this ext3 fs as ext4 and run fs_mark I hear strange sounds >> again. >> >> I use F14 and self compiled kernel from rawhide 2.6.37-1.fc14.x86_64 + >> e2fsprogs-1.41.14-2.fc14.x86_64. >> >> I mount ecryptfs on top of this file system. >> >> Does anyone know what might be causing this strange ext4 behavior? >> > > Hi Michael, > > fs_mark run a fsync heavy test. What you might be hearing is the impact of > the fsync's. ext4 defaults to using "write barriers" enabled, ext3 does not. > Without write barriers, those fsync push data from the box to the write > cache on the drive only. With barriers, the disk will flush that cache to > the platter, so the platter moves and you probably hear the head, etc. > > You can test if this is the cause by mouting ext4 with "nobarrier" to see if > the noise goes away. I mounted fs with nobarrier and now it works just like ext3. Thanks! This solves the riddle :) > > Drives can be noisy, but occasionally, if they are over noisy (you hear > chattering when writing), it might just be a bad drive that has trouble > settling the heads after a seek. > > You might want to check with: > > smartctl -a /dev/sda > > To look for errors that the drive reports. I regularly test all drives that I use, this one is irreproachable 1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0 [..] Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Extended offline Completed without error 00% 10 - > > Good luck! > > Ric > > Thanks for your help! -- Best regards, Michal http://eventhorizon.pl/ -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
