>>We read 64K blocks, so Don't for for backup, but drive-mirror have a "granulary" option to change the block size:
# @granularity: #optional granularity of the dirty bitmap, default is 64K. # Must be a power of 2 between 512 and 64M. ----- Mail original ----- De: "Dietmar Maurer" <[email protected]> À: "VELARTIS Philipp Dürhammer" <[email protected]>, "Dmitry Petuhov" <[email protected]>, "Alexandre DERUMIER" <[email protected]> Cc: [email protected] Envoyé: Vendredi 17 Octobre 2014 13:02:29 Objet: RE: [pve-devel] backup ceph high iops and slow > I agree. The main problem is with used space. > I didnt check for mirroring - but reading unused space for backup is super > fast > (around 1200mb/sec) But used space only 40-50mb/sec and too many iops... We read 64K blocks, so 40000/64 ==> 625 IOPS Maybe the pending ceph read-ahead changes solves that problem?
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