Hello,
We are planning to moving most of our servers to ESX but before buying
our SAN, we want to do some I/O stats to see if iSCSI is enough or if
we have to go with FC. So I found a plugin for Nagios that can log I/O
stats with iostat. So far it's fine with single disk/one partition
servers, but on our Oracle Database 10g server, we have two drives in
RAID 1 (/dev/sda) and 4 other drives in RAID 10 (/dev/sdb). When I
query iostat, I get :
[root@golgoth ~]# iostat
Linux 2.6.9-55.ELsmp (golgoth.acaiq-ctb.lan) 09/21/2009
avg-cpu: %user %nice %sys %iowait %idle
1.83 0.00 3.04 0.79 94.34
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 8.44 12.25 32.40 489731534 1295151278
sda1 0.00 0.00 0.00 21360 7478
sda2 6.60 80.90 44.41 3234128950 1775185432
sda3 0.05 0.20 0.23 7852212 9358056
sda4 0.00 0.00 0.00 2 0
sda5 41.16 38.59 95.20 1542695170 3805566528
sdb 2.84 72.63 28.91 2903208392 1155519494
sdb1 3.67 77.14 23.90 3083762026 955474128
sdb2 1.62 102.92 5.00 4114412086 200045262
So why sda have a lower TPS and bytes read/write than one of it's
partitions (sda5, which is the root partition)? I guess I would have
to collect the stats for each partitions to get what the total?
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