Dne 10.4.2017 v 13:16 lejeczek napsal(a):
On 10/04/17 12:03, Zdenek Kabelac wrote:
Dne 10.4.2017 v 11:29 lejeczek napsal(a):
hi there
I could not extend my stripped LV, had 3 stripes and wanted to add one more.
Only way LVM let me do it was where I ended up with this:
--- Segments ---
Logical extents 0 to 751169:
Type striped
Stripes 3
Stripe size 16.00 KiB
Stripe 0:
Physical volume /dev/sdd
Physical extents 0 to 250389
Stripe 1:
Physical volume /dev/sde
Physical extents 0 to 250389
Stripe 2:
Physical volume /dev/sdc
Physical extents 0 to 250389
Logical extents 751170 to 1001559:
Type linear
Physical volume /dev/sdf
Physical extents 0 to 250389
1st question - was this really the only way LVM would extend?
2nd - is there performance penalty with segments like above vs one stripped
segment?
Hi
Not really sure what you aim to do.
If you have LV segment with 3 stripes - you have to keep also extension
using 3 stripes - you can't have 1st. halve of LV spanning 3 disk and add
there a new LV segment as linear - as listed in this post.
Both segments must by striped.
Regards
Zdenek
I had 3 stripe LV, you know, three PVs, and wanted the LV to have 4 stripes,
wanted to add 4th PV, you can see it from above lvdisplay.
I tried these and each time it errored:
$ lvextend -v -i 4 -l+100%free dellH200.InternalB/0
$ lvextend -v -i 4 -l+100%pv dellH200.InternalB/0 /dev/sdf
You can't request stripe 4 (needs 4 disks) and pass just single /dev/sdf
device.
Zdenek
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