*** artiom [2018-01-07 21:18]: >- Какой ZRAID лучше использовать: ZRAID2 или достаточно ZRAID? >- Имеет ли смысл использовать stripped mirror или это неоправданно >(максимум может быть 8 дисков в корзине, но пока будет 4)?
В книге https://www.michaelwlucas.com/os/fmzfs есть хорошие таблицы по которым можно грубо прикинуть что даёт какой RAID/mirror/stripe и при каком количестве дисков. Демонстрируются характеристики одного диска, а потом из подобных собирают pool-ы: +-------------------------------------------------------------------------------------------+ |Disks|Config| ReadIOPS | WriteIOPS | ReadMB/s | WriteMB/s | Usable Space | Fault Tolerance | |-----+------+----------+-----------+----------+-----------+--------------+-----------------| |1 |Stripe| 250 | 250 | 100 | 100 | 1 TB (100%) | none | +-------------------------------------------------------------------------------------------+ +-------------------------------------------------------------------------------------------+ |Disks|Config |ReadIOPS|WriteIOPS|ReadMB/s|WriteMB/s|Usable Space|Fault Tolerance | |-----+-----------------+--------+---------+--------+---------+------------+----------------| |2 |2 x Stripe |500 |500 |200 |200 |2 TB (100%) |none | |-----+-----------------+--------+---------+--------+---------+------------+----------------| |2 |1 x 2 disk Mirror|500 |250 |200 |100 |1 TB (50%) |1 | +-------------------------------------------------------------------------------------------+ +-------------------------------------------------------------------------------------------+ |Disks|Config |ReadIOPS|WriteIOPS|ReadMB/s|WriteMB/s|Usable Space|Fault Tolerance| |-----+------------------+--------+---------+--------+---------+------------+---------------| |3 |1 x 3 disk Mirror |750 |250 |300 |100 |1 TB (33%) |2 | |-----+------------------+--------+---------+--------+---------+------------+---------------| |3 |1 x 3 disk RAID-Z1|250 |250 |200 |200 |2 TB (66%) |1 | +-------------------------------------------------------------------------------------------+ +-------------------------------------------------------------------------------------------+ |Disks|Config |ReadIOPS|WriteIOPS|ReadMB/s|WriteMB/s|Usable Space|Fault Tolerance| |-----+------------------+--------+---------+--------+---------+------------+---------------| |4 |2 x 2 disk Mirror |1000 |500 |400 |200 |2 TB (50%) |2 (1/VDEV) | |-----+------------------+--------+---------+--------+---------+------------+---------------| |4 |1 x 4 disk RAID-Z1|250 |250 |300 |300 |3 TB (75%) |1 | |-----+------------------+--------+---------+--------+---------+------------+---------------| |4 |1 x 4 disk RAID-Z2|250 |250 |200 |200 |2 TB (50%) |2 | |-----+------------------+--------+---------+--------+---------+------------+---------------| |5 |1 x 5 disk RAID-Z1|250 |250 |400 |400 |4 TB (80%) |1 | |-----+------------------+--------+---------+--------+---------+------------+---------------| |5 |1 x 5 disk RAID-Z2|250 |250 |300 |300 |3 TB (60%) |2 | |-----+------------------+--------+---------+--------+---------+------------+---------------| |5 |1 x 5 disk RAID-Z3|250 |250 |200 |200 |2 TB (40%) |3 | +-------------------------------------------------------------------------------------------+ +--------------------------------------------------------------------------------------------+ |Disks|Config |ReadIOPS|WriteIOPS|ReadMB/s|WriteMB/s|Usable Space|Fault Tolerance| |-----+-------------------+--------+---------+--------+---------+------------+---------------| |6 |3 x 2 disk Mirror |1500 |750 |600 |300 |3 TB (50%) |3 (1/VDEV) | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |6 |2 x 3 disk Mirror |1500 |500 |600 |200 |2 TB (33%) |4 (2/VDEV) | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |6 |1 x 6 disk RAID-Z1 |250 |250 |500 |500 |5 TB (83%) |1 | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |6 |1 x 6 disk RAID-Z2 |250 |250 |400 |400 |4 TB (66%) |2 | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |6 |1 x 6 disk RAID-Z3 |250 |250 |300 |300 |3 TB (50%) |3 | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |12 |6 x 2 disk Mirror |3000 |1500 |1200 |600 |6 TB (50%) |6 (1/VDEV) | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |12 |4 x 3 disk Mirror |3000 |1000 |1200 |400 |4 TB (33%) |8 (2/VDEV) | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |12 |1 x 12 disk RAID-Z1|250 |250 |1100 |1100 |11 TB (92%) |1 | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |12 |2 x 6 disk RAID-Z1 |500 |500 |1000 |1000 |10 TB (83%) |2 (1/VDEV) | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |12 |3 x 4 disk RAID-Z1 |750 |750 |900 |900 |9 TB (75%) |3 (1/VDEV) | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |12 |1 x 12-disk RAID-Z2|250 |250 |1000 |1000 |10 TB (83%) |2 | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |12 |2 x 6-disk RAID-Z2 |500 |500 |800 |800 |8 TB (66%) |4 (2/VDEV) | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |12 |1 x 12-disk RAID-Z3|250 |250 |900 |900 |9 TB (75%) |3 | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |12 |2 x 6-disk RAID-Z3 |500 |500 |600 |600 |6TB (50%) |6 (3/VDEV) | +--------------------------------------------------------------------------------------------+ +--------------------------------------------------------------------------------------------+ |Disks|Config |ReadIOPS|WriteIOPS|ReadMB/s|WriteMB/s|Usable Space|Fault Tolerance| |-----+-------------------+--------+---------+--------+---------+------------+---------------| |36 |18 x 2 disk Mirror |9000 |4500 |3600 |1800 |18 TB (50%) |18 (1/VDEV) | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |36 |12 x 3 disk Mirror |9000 |3000 |3600 |1200 |12 TB (33%) |24 (2/VDEV) | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |36 |1 x 36 disk RAID-Z2|250 |250 |3400 |3400 |34 TB (94%) |2 | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |36 |2 x 18 disk RAID-Z2|500 |500 |3200 |3200 |32 TB (89%) |4 (2/VDEV) | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |36 |4 x 9 disk RAID-Z2 |1000 |1000 |2800 |2800 |28 TB (78%) |8 (2/VDEV) | |-----+-------------------+--------+---------+--------+---------+------------+---------------| |36 |6 x 6 disk RAID-Z2 |1500 |1500 |2400 |2400 |24 TB (66%) |12 (2/VDEV) | +--------------------------------------------------------------------------------------------+ -- Sergey Matveev (http://www.stargrave.org/) OpenPGP: CF60 E89A 5923 1E76 E263 6422 AE1A 8109 E498 57EF