Possible to increase swap size for existing UFS-based drive slice?


 
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Operating Systems Solaris Possible to increase swap size for existing UFS-based drive slice?
# 1  
Old 04-23-2013
Possible to increase swap size for existing UFS-based drive slice?

I like to increase swap size for my current server running solaris 10.
Seems like the system is not using it's full 16G of physical memory.

Code:
#swap -l
swapfile             dev  swaplo blocks   free
/dev/dsk/c0t0d0s1   32,1      16 1058288 1058288

Code:
# swap -s
total: 4125120k bytes allocated + 178808k reserved = 4303928k used, 595088k available

Code:
# format
Searching for disks...done


AVAILABLE DISK SELECTIONS:
       0. c0t0d0 <SUN72G cyl 14087 alt 2 hd 24 sec 424>
          /pci@780/pci@0/pci@9/scsi@0/sd@0,0
       1. c0t1d0 <HITACHI-H101473SCSUN72G-SA23-68.37GB>
          /pci@780/pci@0/pci@9/scsi@0/sd@1,0
       2. c2t0d0 <SEAGATE-ST314655SSUN146G-0B92-136.73GB>
          /pci@7c0/pci@0/pci@1/pci@0,2/LSILogic,sas@2/sd@0,0
       3. c2t1d0 <SEAGATE-ST314655SSUN146G-0B92-136.73GB>
          /pci@7c0/pci@0/pci@1/pci@0,2/LSILogic,sas@2/sd@1,0
       4. c2t2d0 <SEAGATE-ST314655SSUN146G-0B92-136.73GB>
          /pci@7c0/pci@0/pci@1/pci@0,2/LSILogic,sas@2/sd@2,0
       5. c2t3d0 <SEAGATE-ST314655SSUN146G-0B92-136.73GB>
          /pci@7c0/pci@0/pci@1/pci@0,2/LSILogic,sas@2/sd@3,0
       6. c2t4d0 <SEAGATE-ST314655SSUN146G-0B92-136.73GB>
          /pci@7c0/pci@0/pci@1/pci@0,2/LSILogic,sas@2/sd@4,0
       7. c2t5d0 <SEAGATE-ST314655SSUN146G-0B92-136.73GB>
          /pci@7c0/pci@0/pci@1/pci@0,2/LSILogic,sas@2/sd@5,0
       8. c2t6d0 <SEAGATE-ST314655SSUN146G-0B92-136.73GB>
          /pci@7c0/pci@0/pci@1/pci@0,2/LSILogic,sas@2/sd@6,0
       9. c2t7d0 <SEAGATE-ST314655SSUN146G-0B92-136.73GB>
          /pci@7c0/pci@0/pci@1/pci@0,2/LSILogic,sas@2/sd@7,0
      10. c2t8d0 <SEAGATE-ST314655SSUN146G-0B92-136.73GB>
          /pci@7c0/pci@0/pci@1/pci@0,2/LSILogic,sas@2/sd@8,0
      11. c2t9d0 <SEAGATE-ST314655SSUN146G-0B92-136.73GB>
          /pci@7c0/pci@0/pci@1/pci@0,2/LSILogic,sas@2/sd@9,0
      12. c2t10d0 <SEAGATE-ST314655SSUN146G-0B92-136.73GB>
          /pci@7c0/pci@0/pci@1/pci@0,2/LSILogic,sas@2/sd@a,0
Specify disk (enter its number): 0
selecting c0t0d0
[disk formatted]
Warning: Current Disk has mounted partitions.
/dev/dsk/c0t0d0s0 is currently mounted on /. Please see umount(1M).
/dev/dsk/c0t0d0s1 is currently used by swap. Please see swap(1M).
/dev/dsk/c0t0d0s7 is currently mounted on /export/home. Please see umount(1M).

partition> print
Current partition table (original):
Total disk cylinders available: 14087 + 2 (reserved cylinders)

Part      Tag    Flag     Cylinders         Size            Blocks
  0       root    wm     104 -  1224        5.44GB    (1121/0/0)   11407296
  1       swap    wu       0 -   103      516.75MB    (104/0/0)     1058304
  2     backup    wm       0 - 14086       68.35GB    (14087/0/0) 143349312
  3 unassigned    wm       0                0         (0/0/0)             0
  4 unassigned    wm       0                0         (0/0/0)             0
  5 unassigned    wm       0                0         (0/0/0)             0
  6 unassigned    wm       0                0         (0/0/0)             0
  7       home    wm    1225 - 14086       62.41GB    (12862/0/0) 130883712

Looks like only 516.75MB allocated for swap?

Code:
# zpool status
  pool: adpool03
 state: ONLINE
 scrub: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        adpool03    ONLINE       0     0     0
          c0t1d0    ONLINE       0     0     0

errors: No known data errors

  pool: rz2pool
 state: ONLINE
 scrub: none requested
config:

        NAME         STATE     READ WRITE CKSUM
        rz2pool      ONLINE       0     0     0
          raidz2     ONLINE       0     0     0
            c2t0d0   ONLINE       0     0     0
            c2t1d0   ONLINE       0     0     0
            c2t2d0   ONLINE       0     0     0
            c2t3d0   ONLINE       0     0     0
            c2t4d0   ONLINE       0     0     0
            c2t5d0   ONLINE       0     0     0
            c2t6d0   ONLINE       0     0     0
            c2t7d0   ONLINE       0     0     0
            c2t8d0   ONLINE       0     0     0
            c2t9d0   ONLINE       0     0     0
            c2t10d0  ONLINE       0     0     0

errors: No known data errors

Strange part is.... c2t0d0 is also part of a ZFS??

Can someone help me decode this? I inherited this system.
Is the only way to increase swap is to create another swap file (say in /home)?

Any help much appreciated!
# 2  
Old 04-24-2013
Quote:
Originally Posted by JT-KGY
I like to increase swap size for my current server running solaris 10.
Seems like the system is not using it's full 16G of physical memory.
Are you running a 32 bit kernel isainfo -kv ?
Can you post echo ::memstat | mdb -k output ?
Quote:
Strange part is.... c2t0d0 is also part of a ZFS??
What do you mean "also" ? c2t0d0 looks like only to be used by the ZFS pool.
Quote:
Is the only way to increase swap is to create another swap file (say in /home)?
With your layout, yes (but not in /home which is designed for a different purpose and is usually managed by the automounter). You also need a 64 bit kernel.

Last edited by jlliagre; 04-24-2013 at 04:37 PM..
# 3  
Old 04-24-2013
The system appears to have only 4 GB RAM, check with
prtconf and
prtdiag
Adding 1 or 2 GB swap makes sense here.
The disk c0t0d0 appears to be fully used, by UFS filesystems. So it's some expert effort to deduct another swap slice from it. Adding a swap file is easier.
# 4  
Old 04-24-2013
Thanks guys for replying!!!! Much appreciated!

Code:
(in both global and zone)
# isainfo -kv
64-bit sparcv9 kernel modules

Code:
# prtconf | grep -i memory
Memory size: 16376 Megabytes


And jlliagre, you're right about c2t0d0 only in ZFS... I read that wrong.
Also... memstat is not installed on the box.....

MadeInGermany, how do you make that it only has 4GB of RAM?


Additional Info: One of the container is running Oracle 8i.... and it always show that it's using about 2200MB of RAM....
I know that system has 16G and I would like oracle to use more of the RAM.
# 5  
Old 04-24-2013
Quote:
Originally Posted by JT-KGY
Also... memstat is not installed on the box.....
Sorry, my mistake. Please post echo ::memstat | mdb -k output (I missed to write the "echo" command).
Quote:
Additional Info: One of the container is running Oracle 8i.... and it always show that it's using about 2200MB of RAM....
How do you measure this usage ?
Are you running the swap command inside a non-global-zone ?
Is there some capping in place ?
# 6  
Old 04-24-2013
Quote:
Originally Posted by jlliagre
Sorry, my mistake. Please post echo ::memstat | mdb -k output (I missed to write the "echo" command).

How do you measure this usage ?
Are you running the swap command inside a non-global-zone ?
Is there some capping in place ?
Nothing happens when I run
Code:
echo ::memstat | mdb -k

Does it take a long time to run?


I ran prstat -Z on the global
Code:
ZONEID    NPROC  SWAP   RSS MEMORY      TIME  CPU ZONE
     2      122 2427M 2432M    15%  20:28:31 9.4% zone3
     4       64  309M  306M   1.9%   6:29:03 0.2% zone3c
     0       48  187M  185M   1.1%   7:01:24 0.1% global
     3       62  406M  409M   2.5%   7:18:24 0.0% zone3b
     1       42 1414M 1417M   8.7%   6:09:35 0.0% zone3a

Looks like it's using 2432M of memory now.....

No capping, I believe
Code:
# zonecfg -z zone3 info
zonename: zone3
zonepath: /zones2/zone3
brand: native
autoboot: true
bootargs:
pool:
limitpriv:
scheduling-class:
ip-type: shared
net:
        address: 192.168.125.24
        physical: e1000g0
dataset:
        name: rz2pool/database

# 7  
Old 04-24-2013
Quote:
Originally Posted by JT-KGY
Nothing happens when I run
Code:
echo ::memstat | mdb -k

Does it take a long time to run?
It should take seconds if you have Solaris 10 update 8 or newer. Might take minutes or even an hour if you have an older Solaris release (see https://blogs.oracle.com/sistare/ent...d_fast_memstat )
Quote:
I ran prstat -Z on the global
Code:
ZONEID    NPROC  SWAP   RSS MEMORY      TIME  CPU ZONE
     2      122 2427M 2432M    15%  20:28:31 9.4% zone3
     4       64  309M  306M   1.9%   6:29:03 0.2% zone3c
     0       48  187M  185M   1.1%   7:01:24 0.1% global
     3       62  406M  409M   2.5%   7:18:24 0.0% zone3b
     1       42 1414M 1417M   8.7%   6:09:35 0.0% zone3a

Looks like it's using 2432M of memory now.....
So according to prstat, you have 16 GB of memory. Do you feel there is still a problem to solve ?
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