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08-23-2011 04:56 AM
08-23-2011 04:56 AM
Hi
Primary swap is 8GB
added a sec swap of 8Gb(this entry is there in fstab) a few months back
now if i want o increase swap again...
then do I need to create a new lv and add it?
or can i lvextend the secondary swap? Thanks.
VG00 has enough space..to add/create LVs etc
# swapinfo -tam
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 8192 0 8192 0% 0 - 1 /dev/vg00/lvol2
dev 8192 0 8192 0% 0 - 2 /dev/vg00/sec_swap
reserve - 16384 -16384
memory 46705 19962 26743 43%
total 63089 36346 26743 58% - 0 -
#
Solved! Go to Solution.
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- swap
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08-23-2011 05:04 AM
08-23-2011 05:04 AM
Re: extend a swap
Hi:
You can extend your secondary swap as long as you have immediately adjacent, free physical extents such that the 'contiguous' property is maintained for the logical volume.
Otherwise, add a new logical volume as swap.
Regards!
...JRF...
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08-23-2011 05:21 AM
08-23-2011 05:21 AM
Re: extend a swap
Good point indeed.
Please let me know how to determine If i have such Contiguous space. Thank you
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08-23-2011 05:36 AM
08-23-2011 05:36 AM
Re: extend a swap
@silusan wrote:Good point indeed.
Please let me know how to determine If i have such Contiguous space. Thank you
Hi (again):
The output of 'pvdisplay -v <device>' will show you the distribution of used (current) and free extents.
Regards!
...JRF...
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08-23-2011 06:19 AM
08-23-2011 06:19 AM
Re: extend a swap
JRF..
What I understand is....
55 PEs are free between sec swap LV and some other LV(lv10).
PEs from 968 till 1023 are free.
PE size is 64MB
55PE x 64MB = 3520MB
sec swap can be extended by just 3520MB as a contiguos space.
If I want 8Gb addidtional swap..then i think i need to create a new LV.
Please suggest..thanks
vgdisplay -v vg00 gives:
LV Name /dev/vg00/addiswap
LV Status available/syncd
LV Size (Mbytes) 8192
Current LE 128
Allocated PE 256
Used PV 2
--- Physical volumes ---
PV Name /dev/disk/disk14_p2
PV Status available
Total PE 4456
Free PE 3352
Autoswitch On
Proactive Polling On
PV Name /dev/disk/disk17_p2
PV Status available
Total PE 4456
Free PE 3352
Autoswitch On
Proactive Polling On
:/ #
:/ # pvdisplay -v /dev/disk/disk14_p2|more
--- Physical volumes ---
PV Name /dev/disk/disk14_p2
VG Name /dev/vg00
PV Status available
Allocatable yes
VGDA 2
Cur LV 12
PE Size (Mbytes) 64
Total PE 4456
Free PE 3352
Allocated PE 1104
Stale PE 0
IO Timeout (Seconds) default
Autoswitch On
Proactive Polling On
--- Distribution of physical volume ---
LV Name LE of LV PE for LV
/dev/vg00/lvol1 24 24
/dev/vg00/lvol2 128 128
/dev/vg00/lvol3 96 96
/dev/vg00/lvol4 8 8
/dev/vg00/lvol5 104 104
/dev/vg00/lvol6 64 64
/dev/vg00/lvol7 72 72
/dev/vg00/lvol8 128 128
/dev/vg00/lvol9 256 256
/dev/vg00/osmf 24 24
/dev/vg00/lvol10 72 72
/dev/vg00/addiswap 128 128
--- Physical extents ---
PE Status LV LE
00000 current /dev/vg00/lvol1 00000
00001 current /dev/vg00/lvol1 00001
00002 current /dev/vg00/lvol1 00002
....
00011 current /dev/vg00/lvol1 00011
00012 current /dev/vg00/lvol1 00012
....
00839 current /dev/vg00/osmf 00023
00840 current /dev/vg00/addiswap 00000
00841 current /dev/vg00/addiswap 00001
00842 current /dev/vg00/addiswap 00002
....
00861 current /dev/vg00/addiswap 00021
00862 current /dev/vg00/addiswap 00022
00863 current /dev/vg00/addiswap 00023
00864 current /dev/vg00/addiswap 00024
00865 current /dev/vg00/addiswap 00025
00866 current /dev/vg00/addiswap 00026
00867 current /dev/vg00/addiswap 00027
00868 current /dev/vg00/addiswap 00028
....
00885 current /dev/vg00/addiswap 00045
00886 current /dev/vg00/addiswap 00046
....
00957 current /dev/vg00/addiswap 00117
00958 current /dev/vg00/addiswap 00118
....
00966 current /dev/vg00/addiswap 00126
00967 current /dev/vg00/addiswap 00127
00968 free 00000
00969 free 00000
....
01020 free 00000
01021 free 00000
01022 free 00000
01023 free 00000
01024 current /dev/vg00/lvol10 00000
01025 current /dev/vg00/lvol10 00001
01026 current /dev/vg00/lvol10 00002
01027 current /dev/vg00/lvol10 00003
01028 current /dev/vg00/lvol10 00004
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08-23-2011 06:29 AM
08-23-2011 06:29 AM
Re: extend a swap
@silusan wrote:If I want 8Gb addidtional swap..then i think i need to create a new LV.
Yes, that is what I would do.
Regards!
...JRF...
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08-23-2011 06:59 AM
08-23-2011 06:59 AM
Re: extend a swap
would it be
swapon -p 3 /dev/vg00/third_swap
(after creating an LV ..for say 8GB)
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08-23-2011 07:23 AM
08-23-2011 07:23 AM
Re: extend a swap
@silusan wrote:would it be
swapon -p 3 /dev/vg00/third_swap
(after creating an LV ..for say 8GB)
Hi:
The swap priority given that all of the swap devices are on the same volume group can be argued two ways. Swap devices of equal priority cause swap to interleave between/among the devices. Swap devices of different priority mean that one or more devices will be used before proceeding to the next. The priority value is the opposite of the choice order.
Given this, creating swap devices of equal priority on a given volume group may cause disk head-banging as swap I/O occurs, leading to a further degradation in performance.
Then again, as a friend named Clay liked to say, worrying about swap priority is like worrying about re-arranging the deck chairs on the Titanic.
The choice is yours. Your best choice is not to overload your server and have ample memory. Then, swap space becomes important only for process swap reservation and real swapping never occurs.
Regards!
...JRF...
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08-23-2011 09:07 AM
08-23-2011 09:07 AM
Re: extend a swap
Thanks . I understood.
# swapinfo -tam
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 8192 0 8192 0% 0 - 1 /dev/vg00/lvol2
dev 8192 0 8192 0% 0 - 2 /dev/vg00/addiswap
reserve - 16384 -16384
memory 31121 18852 12269 61%
total 47505 35236 12269 74% - 0 -
le85odb1:/ #
lvol2 is priority 1
(lv)addiswap is priority 2
so i think (lv)thirdswap prority as 3 would be the order.
I didnt quite understood this line "The priority value is the opposite of the choice order"
Does that mean swap with priority 1 would be used only after swap with priority 2 is fully consumed?
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08-23-2011 09:12 AM
08-23-2011 09:12 AM
Re: extend a swap
swap=8+8=16GB already
memory=48GB
User may ask to get the swap increased. so I am contemplating ...whether to extend lv or create a new lv. I got the answer from you(JRF) - need contiguous PEs to do lvextend..otherwise create new lv.