Yes, they are. Write speed of a RAID5 is affected by the parity updates. For each written block the corresponding parity block has to be read, updated, and then written back, so RAID5 gives you almost no write speed gain, no matter how many spindles it has. RAID10 of 4 spindles provides 2x write and 4x read speed gain (12 disks = x6 write speed and 12x read). Though I admit it's not x17 times, but merging process produces quite intensive random I/O load on the storage, so the performance may vary. Also may I ask you what method do you use for full backups - synthetic or active?Are 12 (SATA) spindles in RAID-10 really that much (17x) quicker than 6 (SATA) spindles in RAID-5, for merge operations, all else being equal?
, please clarify.We're pretty much an 0800 - 1800 office so additional load on original VMDKs is out-of-hours is of no real concern
pkelly_sts wrote:Can I also just confirm that the merge process for Backup Copy is the same as for Forever Forward incremental?
foggy wrote:Regular chain merge is completely the same, however GFS transform is a bit different (more blocks need to be read and written, hence more I/O).
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