I have the same issue and my pool is on an ext3 partition.


Linux Backuppc 2.6.31-22-server #65-Ubuntu SMP Thu Sep 16 16:33:54 UTC 2010 
x86_64

rrdtool info pool.rrd
filename = "pool.rrd"
rrd_version = "0003"
step = 86400
last_update = 1285743391
ds[ckb].type = "GAUGE"
ds[ckb].minimal_heartbeat = 172800
ds[ckb].min = 0.0000000000e+00
ds[ckb].max = NaN
ds[ckb].last_ds = "507023476"
ds[ckb].value = 1.2671023689e+13
ds[ckb].unknown_sec = 0
rra[0].cf = "AVERAGE"
rra[0].rows = 1400
rra[0].cur_row = 532
rra[0].pdp_per_row = 1
rra[0].xff = 5.0000000000e-01
rra[0].cdp_prep[0].value = NaN
rra[0].cdp_prep[0].unknown_datapoints = 0

/dev/sdb1 on /var/lib/backuppc type ext3 (rw)

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