On Wed, May 15, 2019 at 2:32 PM Nicolas Ecarnot <[email protected]> wrote:
> > > > > This can happen when using thin provisioned disks on block storage > > (iSCSI, FC). We provision such disk with 1G, and and extend the disk > > (add 1G) when it becomes too full (by default, free space < 0.5G). > > > > If we fail to extend the disk quick enough, > > > "quick enough" -> Is there some place where this threshold can be > configured? > Hi, it is some time I don't go into it, because I anyway tend to use preallocated disks on block storage, but at 4.0, 4.1 time, when using thin dsks, the parameters and their tested values were these in vdsm.conf section [irs] or in some other file such as /etc/vdsm/vdsm.conf.d/50_thin_block_extension_rules.conf [irs] # Together with volume_utilization_chunk_mb, set the minimal free # space before a thin provisioned block volume is extended. Use lower # values to extend earlier. volume_utilization_percent = 20 # Size of extension chunk in megabytes, and together with # volume_utilization_percent, set the free space limit. Use higher # values to extend in bigger chunks. volume_utilization_chunk_mb = 8192 Crosscheck in 4.2/4.3. Also, I remember I had problems in RHV 4.2 and RHVH hosts trying to customize vdsm.conf, but I didn't deal much with it because I decided then to use preallocated and not use anymore those parameters. HIH investigating more, Gianluca
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