[linux-lvm] lvchange read ahead sectors
kpodesta at redbrick.dcu.ie
Mon Feb 26 11:33:50 UTC 2007
Does anyone know if I can change "read ahead sectors" to 1024 with LVM1 ?
I'm using lvm-1.0.5-129 on SUSE/SLES 8 - I have a logical volume with
"read ahead sectors" set to 1024, and another one with the value as
0 (i.e. disabled). When I try to set the latter one to 1024 using
"lvchange -r 1024", I get:
lvchange -- ERROR "Invalid argument" read ahead sector change
... and then in the lvchange man page I notice:
-r, --readahead ReadAheadSectors
Change read ahead sector count per logical between
2 and 120.
If I can only set the value to 120, how come I have a volume with 1024?
Is there a conversion needed between the two values?
If anyone could shed some light on this or point me in the right
direction, that would be great! Haven't had any joy looking through
stuff on the net, or on the archives of this list...
PS - I realise this list is hosted on redhat.com, so sorry for any
cross-distro pollination! :-)
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