Free memory from SAR and free -m command


Sometimes we confuse about is a system have an inadequate memory after look after "sar" and "free" command or not.
Sar description about memory allocation :

Total: how much physical memory the machine has
Used: amount of used (kernel + user + buffers + cache) memory
Free: how much unallocated memory
Shared: how much is shared via shm, mmap, shlibs, etc.
Buffers: how much is preallocated to unused kernel buffers
Cached: how much is preallocated to unsued filesystem buffer cache

free –m description about memory allocation :

Used: amount of system memory that is actually in use. This is the first line 'used' - (buffers + cache)
Free: amount of memory that isn't actually busy. This is the first line 'free' + buffers + cache.

For example :
# free -m
total used free shared buffers cached

Mem: 8007 7989 17 0 120 7053

-/+ buffers/cache: 815 7191

Swap: 8189 0 8189

Used 7989 – (120 + 7053) = 816
Free 17 + 120 + 7053 = 7190

Popular posts from this blog

Howto configure boot device order on ILOM

To ensure the system can be installed using the DVD drive, the boot device order in the BIOS has to be configured correctly so that the DVD drive takes precedence over the internal hard drives. 1 Log into the ILOM. 2 Start the system if it is not already running: > start /SYS else reset the system: > reset /SYS 3 Log onto the system’s console: > start /SP/console 4 When prompted, press Esc 2 to enter setup. 5 Once the setup menu has loaded, navigate across to the Boot screen by using the right arrow key. 6 Using the down arrow key, select the Boot Device Priority item and press Enter. 7 Confirm that the item [CD/DVD] is higher in the list than the item [Hard Drive]. The order can be changed by selecting the relevant item and using the +/- keys to move the item up or down in the list. 8 Once the order is correct, save any changes made by pressing Esc and then navigate right to the Exit screen. Select the item Save Changes and Exit and press Enter, then confirm
Read more

SAN Switch Config Command

Login via console Fabric OS (swd77) swd77 console login: admin Password: Note: password default is "password" - set hostname swd77:admin> switchName swcdr1 Committing configuration... Done. swcdr1:admin> - set IP Address swcdr1:admin> ipaddrset Ethernet IP Address [192.168.0.25]: 192.168.0.11 Ethernet Subnetmask [255.255.255.0]: Fibre Channel IP Address [0.0.0.0]: Fibre Channel Subnetmask [0.0.0.0]: Gateway IP Address [192.168.0.25]: 0.0.0.0 Issuing gratuitous ARP...Done. 2008/07/14-18:46:43, [WEBD-1007], 494,, INFO, swcdr1, HTTP server will be restarted due to change of IP Address IP address is being changed...Done. Committing configuration...Done. - Configure basic parameter swcdr1:admin> switchDisable swcdr1:admin> configure Configure... Fabric parameters (yes, y, no, n): [no] y Domain: (1..239) [1] 22008/07/14-18:50:40, [FW-1424], 24,, WARNING, swcdr1, Switch status changed from HEALTHY to MARGINAL. 2008/07/14-18:50:40, [FW-1439], 25,, WARNING, swcdr
Read more

Howto cstm on HP-UX

If we want to show all machine information, just use cstm. # cstm Running Command File (/usr/sbin/stm/ui/config/.stmrc). -- Information -- Support Tools Manager Version C.46.05 (C) Copyright Hewlett Packard Co. 1995-2002 All Rights Reserved Use of this program is subject to the licensing restrictions described in "Help-->On Version". HP shall not be liable for any damages resulting from misuse or unauthorized use of this program. cstm> Map all device in this system with : cstm> map Dev Last Last Op Num Path Product Active Tool Status === ==================== ========================= =========== ============= 1 system system (1014) Information Successful 2 memory IPF_MEMORY (1014) Information Successful ------------ We want to know info about memory information cstm>sel d 2 cstm>
Read more