[MooseFS-Users] Performance degradation after snapshot

[Alexander A. <ba...@ya...>]

Hi!

Dear developers!

Could you shortly describe what happens when I make snapshot?

Well ... why I'm asking:

On the top of MooseFS I use iSCSI target (SCST) to share space to Windows.

So size of all files in the directory containing files which are used by 
SCST is 10 TB.


# ls -l /moosefs/iscsi
total 12231639044
-rw-r--r-- 1 root root  751619276801 Aug 27 09:33 CSV1
-rw-r--r-- 1 root root  751619276801 Aug 27 09:33 CSV2
-rw-r--r-- 1 root root 1099511627777 Aug 27 09:33 HOME
-rw-r--r-- 1 root root 8796093022209 Aug 27 09:33 PROJECTS
-rw-r--r-- 1 root root    5368709121 Aug 27 09:17 quorum
-rw-r--r-- 1 root root   21474836481 Aug 26 14:44 WOF

And when I launch mfsmakesnapshot performance which gets Windows on 
iSCSI drives

dramatically drops down for 20-30 min.


Thanks for answer!

WBR
Alexander