Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Where does applying blockdev --setra fit in regard to drbd, particularly if one is running drbd over lvm? The post below (from the LVM mailing list) says it must be set across the entire I/O subsystem. (A later post clarified that optimum performance occurred when it was set to > 0 at the lv layer and zero for both device and md layers.) Also, does anyone know where the values get stored when they are applied to the device itself? > >>Hi Guys, >>> >>>Should one set blockdev --setra on the lvm device, on the individual >>>block devices making up the lvm device or both? >>> >>> >>> >>> >> >>Interesting question. Answer to that IMHO depends on the internal kernel >>structures. >> >>Isn't the easisest aproach to try and see what happens ? >> >>Regards, >> >>Branko >> >> > > From experimentation: set it on everything. >device, md, lv > >David -- Maurice Volaski, mvolaski at aecom.yu.edu Computing Support, Rose F. Kennedy Center Albert Einstein College of Medicine of Yeshiva University