Re: [gentoo-user] extending /usr partition...

[Dirk Heinrichs <dirk.heinrichs@online.de>]

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Am Samstag, 21. März 2009 19:39:08 schrieb Jarry:

> And one more counter-argument: with traditional partitions I can select
> where a certain partition is (physically). Those partitions accessed
> frequently I put to the beginning of the disk with higher transfer-rate.
> In my case, it makes quite difference:
>
> obelix ~ # hdparm -t /dev/md2
>   Timing buffered disk reads:  252 MB in  3.02 seconds =  83.23 MB/sec
>
> obelix ~ # hdparm -t /dev/md9
>   Timing buffered disk reads:  150 MB in  3.02 seconds =  49.72 MB/sec

Who says you'd loose that ability with LVM? You could

1) Create two md devices and put one volume group on top of each calling them 
vg-fast and vg-slow, then put your logical volumes into either VG.

2) Keep your setup with 9 md devices and put one large VG on top, then for 
each LV tell LVM on which physical volume (PV) it should reside (don't know 
wether that really works, though. Just guessing that this is what the 
"PhysicalVolumePath" in lvcreate is meant for, the man page leaves it open).

Bye...

	Dirk



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