Are stride settings needed for Hardware RAID devices? For example, if I do a RAID 5 on a HP-P800 I get a 9.1TB filesystem. Should I worry about stride in that case? On Wed, Mar 16, 2011 at 2:02 PM, David Shaw <dshaw@xxxxxxxxxxxxxxx> wrote: > On Mar 15, 2011, at 6:53 PM, Eric Sandeen wrote: > >> On 3/15/11 5:42 PM, David Shaw wrote: >>> Hello, >>> >>> I understand the need for a proper stride setting when formatting a >>> filesystem on a RAID device. ÂHowever, is there any problem in using >>> a stride setting when formatting a filesystem on a regular non-RAID, >>> non-SSD, just plain-vanilla-single-disk block device? ÂI'm sure there >>> isn't any benefit to it, but I'm curious if there is any harm. >>> >>> The reason I ask is I'm looking at some code here that can be used on >>> either RAID or non-RAID devices. ÂThe stride setting it has is >>> correct for the particular RAID setup it is intended for, but it also >>> uses those settings when formatting a non-RAID device. >>> >>> David >> >> just FWIW, recent kernels & e2fsprogs will just automatically pick >> stride based on storage geometry - for md/lvm at least, and for >> scsi devices that export this geometry as well. >> >> ext4 has a little stripe-awareness in its allocator; otherwise, stride >> just staggers bitmap starts so they don't all end up on the same spindle; [1] >> Offhand I don't think it'd cause any harm to set stride on non-raid. > > Thanks very much for your pointers. ÂIt's a nice enhancement that this is done automatically now. > > David > > > _______________________________________________ > Ext3-users mailing list > Ext3-users@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/ext3-users > _______________________________________________ Ext3-users mailing list Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
