Re: Aix begin to use pagingspace while the physical memory was not used up
- From: Mark Viduka <cuihh@xxxxxxxxxxxxxxxxxx>
- Date: Thu, 5 Jan 2006 14:33:43 +0800
Hi,Simon
I have a database server and i make a full db backup every three days to a
jfs2 file system on it's internal hard disk using dd and then compress the
datafile in the jfs2 file system. The db backup process endures for 4
hours.
My problem is:
Each time the db backup process has finished. Paging space usage of the
database server increase about 3 percent. And I found oracle server
processes ( the number of oracle server process is more than 100) use more
paging space than before,though there are about 50 percent physical memory
is free. It seems that during db backup, more file system cache is needed
and VMM has to steal pages that used by other processes, But after the db
backup process finished these pages are not paged into physical memory
again.
Later i have made a test:
i create a jfs bigfile enabled system used for db backup instead of the
jfs2 file systems. Then the above problems disappeared,everything looks OK.
Here i supply the vmm parameters on my server(AIX 5206):
cpu_scale_memp = 8
data_stagger_interval = 161
defps = 1
force_relalias_lite = 0
framesets = 2
htabscale = -1
kernel_heap_psize = 4096
large_page_heap_size = 0
lgpg_regions = 0
lgpg_size = 0
low_ps_handling = 1
lru_file_repage = 1
lru_poll_interval = 0
lrubucket = 131072
maxclient% = 20
maxfree = 128
maxperm = 392781
maxperm% = 20
maxpin = 1677722
maxpin% = 80
mbuf_heap_psize = 4096
memory_affinity = 1
memory_frames = 2097152
mempools = 1
minfree = 120
minperm = 98195
minperm% = 5
nokilluid = 0
npskill = 8192
npswarn = 32768
num_spec_dataseg = 0
numpsblks = 1048576
pagecoloring = 0
pinnable_frames = 1693995
pta_balance_threshold = 0
relalias_percentage = 0
soft_min_lgpgs_vmpool = 0
spec_dataseg_int = 512
strict_maxclient = 1
strict_maxperm = 1
v_pinshm = 0
vmm_fork_policy = 0
hd_pbuf_cnt = 2816
hd_pvs_opn = 18
j2_dynamicBufferPreallocation = 16
j2_inodeCacheSize = 400
j2_maxPageReadAhead = 128
j2_maxRandomWrite = 1
j2_maxUsableMaxTransfer = 512
j2_metadataCacheSize = 400
j2_minPageReadAhead = 2
j2_nBufferPerPagerDevice = 512
j2_nPagesPerWriteBehindCluster = 8
j2_nRandomCluster = 8
j2_non_fatal_crashes_system = 0
j2_syncModifiedMapped = 1
jfs_clread_enabled = 0
jfs_use_read_lock = 1
lvm_bufcnt = 9
maxpgahead = 8
maxrandwrt = 1
memory_frames = 2097152
minpgahead = 2
numclust = 1
numfsbufs = 196
pd_npages = 65536
pgahd_scale_thresh = 0
sync_release_ilock = 1
hd_pendqblked = 251304
psbufwaitcnt = 0
fsbufwaitcnt = 47376
rfsbufwaitcnt = 0
xpagerbufwaitcnt = 1242138
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