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(Sorry if the formatting is off.)
RedHat 7.2 with 2.4.18-18.7.xbigmem using RedHat's software RAID package.
I've been seeing quite a bit of page in/page out going on, and have been looking around.
We have a monitoring system that believes anything over 10 for pages/second could be a problem, and 20 is really bad.
I've gathered this from one of my systems, where: Pgs_in=pages_in (average for day) Pgs_in_max=pags_in_maximum (maximum value for day) Pgs_out=pages_out (average for day) Pgs_out_max=pags_out_maximum (maximum value for day)
Some output from one of our Linux systems:
sample_date pgs_in pgs_in_max pgs_out pgs_out_max
5/16/2003 0.07 5.68 53.32 159.54
5/17/2003 0.04 3.27 49.89 167.2
5/18/2003 0.09 5.74 50.57 159.61
5/19/2003 0.02 0.04 51.55 160.07
5/20/2003 25.86 657.06 57.06 166.05
5/21/2003 56.21 970.79 66.15 156.4
5/22/2003 10.48 1371.75 58.27 168.07
5/23/2003 0.33 39.9 56.77 148.58
5/24/2003 0.03 0.26 56.2 162.94
5/25/2003 0.02 0.49 56.45 166.74
5/26/2003 0.05 1.13 65.62 173.82
5/27/2003 36.8 754.51 64 203.06
Hence that difficult question of what is the norm? I'm trying to figure out if I have a problem or this is 'normal' for the system: a dual-CPU 1.4GHz PIII with 4GB of RAM. The OS is on a local Hardware RAID card, but other data/apps are on a SAN attached software RAID0 device.
# more raidtab
raiddev /dev/md0
raid-level 0
nr-raid-disks 2
persistent-superblock 1
chunk-size 32
device /dev/sdc1
raid-disk 0
device /dev/sdd1
raid-disk 1
# free
total used free shared buffers cached
Mem: 3874464 3843256 31208 0 381844 3084184
-/+ buffers/cache: 377228 3497236
Swap: 2048248 0 2048248
# sar -r
Linux 2.4.18-18.7.xbigmem 05/29/2003
12:00:00 AM kbmemfree kbmemused %memused kbmemshrd kbbuffers kbcached kbswpfree kbswpused %swpused
12:10:00 AM 33956 3840508 99.12 0 381020 3085476 2048248 0 0.00
# swapon -s
Filename Type Size Used
Priority
/dev/sda6 partition 2048248 0 -1
# more /etc/fstab
LABEL=/ / ext3
defaults 1 1
LABEL=/boot /boot ext3
defaults 1 2
none /dev/pts devpts
gid=5,mode=620 0 0
LABEL=/home /home ext3
defaults 1 2
none /proc proc
defaults 0 0
none /dev/shm tmpfs
defaults 0 0
LABEL=/tmp /tmp ext3
defaults 1 2
LABEL=/usr /usr ext3
defaults 1 2
LABEL=/var /var ext3
defaults 1 2
/dev/md0 /hosting ext3 defaults,usrquota 0 0
/dev/sda6 swap swap
defaults 0 0
/dev/cdrom /mnt/cdrom iso9660
noauto,owner,kudzu,ro 0
0
/dev/fd0 /mnt/floppy auto
noauto,owner,kudzu 0 0
# sar -B
Linux 2.4.18-18.7.xbigmem 05/29/2003
12:00:00 AM pgpgin/s pgpgout/s activepg inadtypg inaclnpg inatarpg ...
Average: 0.02 55.34 561672 225090 115799 180512
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