On 07/07/2015 02:28 PM, David Weber wrote:
How do you backup the VM images? If filefrag takes hours to complete,
I'd assume that attempting a sequential read of the whole file (from a
backup software) takes just as long.
I use send/receive. With an SSD it doesn't take that long.
Hmmm. The kind of backup you can restore only as a whole,
not individual files... plus you have to hope there are never
systematic bugs in btrfs that would make an individual file
as unreadable from the backup (undetected by send/receive)
as it is from the original. :-)
I for one prefer backups to read/write individual files and
to use a different format for storage.
A sequential read (dd if=Windows7.vdi of=/dev/zero bs=1M) gives nearly raw
SSD Speed. But CPU consumption is indeed quite high...
Ok, if all the VM image data is on SSDs, the high fragmentation
might be less of an issue to you.
Regards,
Lutz Vieweg
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