Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hey list, did anybody of you guys recently play around with the blockdev --setra command? My setup (software-raid/drbd/lvm/iscsi/xen) is rather complex stacked and I was wondering if I am able to gain a performance boost at all here. Would I have to apply the "blockdev --setra xy" to all of the involved physical devices? e.g. blockdev --setra 1024 /dev/sd[a-d] blockdev --setra 1024 /dev/md3 blockdev --setra 1024 /dev/vg_storage/volume (well and also on the iscsi blockdevice on the xen server AND on the virtual device inside the xen DomU..?) The only block device I did not touch at all was /dev/drbd0 because it already had a non-standard setting (786 in my case) Comparing the bonnie results, setting the read-ahead value on some or all of the above mentioned did not change much (values varied by 1-4mb/sec) Mit freundlichen Grüßen / with kind regards Rudolph Bott -- Megabit Informationstechnik GmbH Karstr.25 41068 Moenchengladbach Tel:02161/30898-0 Fax:-18 AG MG HRB 10141, GF: Dipl.-Ing. Thomas Tillig, Michael Benten