[squid-users] rock problem on each squid restart

on each squid restart the drive which is rock have some problems .
that drive is very very busy after several minutes . the following line
shows iostat after 18 minutes

Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
sdb 3004.00 41324.00 0.00 41324 0

cache.log includes a lot of following lines
WARNING: cache_dir[0]: Ignoring malformed cache entry meta data at
51174042469

if again i restart squid it takes same time . in that time squid performance
decreases and sometimes could not serve http . is this a normal behavior of
rock ?

here is my squid.conf
cache_dir rock /cache2 101000 min-size=0 max-size=32767

fstab
/cache2 ext4
noatime,nodiratime,discard,errors=remount-ro,data=writeback,barrier=0,async
0 0

drive is OCZ-VERTEX3 120GB

Store Directory #0 (rock): /cache2
FS Block Size 1024 Bytes

Maximum Size: 103424000 KB
Current Size: 43675803.08 KB 42.23%
Maximum entries: 3232098
Current entries: 1364910 42.23%
Pending operations: 127 out of 0
Flags: SELECTED

the config is available in this post
<http://squid-web-proxy-cache.1019090.n4.nabble.com/IpIntercept-cc-137-NetfilterInterception-NF-getsockopt-SO-ORIGINAL-DST-failed-on-FD-4125-2-No-such-fy-td4662558.html>

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