Originally posted by: grukrz1
hello,
I have mirrored VG built of two LUNs (each LV in the VG is mirrored on these LUNs).
iostat shows:
hdisk2 xfer: %tm_act bps tps bread bwrtn
17.3 1.6M 239.7 226.1K 1.4M
read: rps avgserv minserv maxserv timeouts fails
8.0 7.4 0.1 4.0S 0 0
write: wps avgserv minserv maxserv timeouts fails
231.8 1.3 0.1 5.8S 0 0
queue: avgtime mintime maxtime avgwqsz avgsqsz sqfull
1.4 0.0 9.5S 0.1 0.0 52.4
hdisk3 xfer: %tm_act bps tps bread bwrtn
44.2 1.6M 242.1 237.2K 1.4M
read: rps avgserv minserv maxserv timeouts fails
10.3 8.7 0.1 3.7S 0 0
write: wps avgserv minserv maxserv timeouts fails
231.7 3.7 0.1 6.7S 0 0
queue: avgtime mintime maxtime avgwqsz avgsqsz sqfull
2.6 0.0 6.7S 0.1 0.1 56.7
What can be the reason that %tm_act is much higher for hdisk3?
Are sqfull statistics ok or maybe queue_depth should be adjusted (currently queue_depth is 8 for the LUNs from hitachi storage we use).
thx in advance,
K.
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