amazon ec2 - Why do Windows snapshots take a long time? -

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i running vanilla windows install on amazon ebs volume. computer takes 10 minutes boot, may understandable 2 reboots required. however, taking snapshot 10-15 minute process. can explain this? way speed up? bit surprised, because thought snapshots immediate replicas of running ebs volume, in case shouldn't take couple of seconds complete?

i add console shows "snapshot" completed quickly. "ami" section seems take 10-20 minutes. what's difference? snapshot available use immediately, or need wait ami?

from ebs product page:

amazon ebs snapshots incremental backups, meaning blocks on device have changed since last snapshot saved. if have device 100 gbs of data, 5 gbs of data has changed since last snapshot, 5 additional gbs of snapshot data stored amazon s3.

subsequent snapshots fast because changed blocks need saved. time takes scales amount of changes since last snapshot.

is snapshot available use immediately, or need wait ami?

also product page:

new volumes created existing amazon s3 snapshots load lazily in background. means once volume created snapshot, there no need wait of data transfer amazon s3 amazon ebs volume before attached instance can start accessing volume , of data. if instance accesses piece of data hasn’t yet been loaded, volume download requested data amazon s3, , continue loading rest of volume’s data in background.


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