All,
We had a situation where write speeds to a ZFS consisting of 2 7TB RAID5 LUNs
came to a crawl. We have spent a good 100 men hours trying to troubleshoot the
issue eliminating HW issues. In the end, when we whacked about 2TB out of 14,
performance went back to normal (300megs+ vs 3 megs when it was poor).
I would like some understanding as to why this is the case with ZFS, as well as
for what threshold to look out for.
Ths was the layout when performance was 3megs/sec
beast 130G 37K 130G 1% /mnt/backup1
beast/customer1 130G 29K 130G 1% /mnt/backup1/customer1
beast/customer1/bacula 222G 93G 130G 42% /mnt/backup1/customer1/bacula
beast/customer1/db 2.0T 1.8T 130G 94% /mnt/backup1/customer1/db
beast/customer1/fs 2.1T 1.9T 130G 94% /mnt/backup1/customer1/filesystem
beast/customer5 130G 29K 130G 1% /mnt/backup1/customer5
beast/customer5/bacula
221G 92G 130G 42% /mnt/backup1/customer5/bacula
beast/customer5/db 130G 25K 130G 1% /mnt/backup1/customer5/db
beast/customer5/fs 172G 42G 130G 25% /mnt/backup1/customer5/filesystem
beast/bacula 130G 15M 130G 1% /mnt/backup1/bacula
beast/bacula/spool 130G 34K 130G 1% /mnt/backup1/bacula/spool
beast/customer6 130G 29K 130G 1% /mnt/backup1/customer6
beast/customer6/bacula 210G 81G 130G 39% /mnt/backup1/customer6/bacula
beast/customer6/db 3.7T 3.6T 130G 97% /mnt/backup1/customer6/db
beast/customer6/fs 130G 25K 130G 1% /mnt/backup1/customer6/filesystem
beast/customer2 133G 3.6G 130G 3% /mnt/backup1/customer2
beast/customer2/bacula 1.5T 1.4T 130G 92% /mnt/backup1/customer2/bacula
beast/customer2/db 194G 65G 130G 34% /mnt/backup1/customer2/db
beast/customer2/fs 221G 92G 130G 42% /mnt/backup1/customer2/filesystem
beast/customer4 130G 29K 130G 1% /mnt/backup1/customer4
beast/customer4/bacula 1.3T 1.2T 130G 90% /mnt/backup1/customer4/bacula
beast/customer4/db 1.6T 1.5T 130G 92% /mnt/backup1/customer4/db
beast/customer4/fs 130G 25K 130G 1% /mnt/backup1/customer4/filesystem
beast/customer3 130G 26K 130G 1% /mnt/backup1/customer3
beast/customer3/bacula
2.8T 2.6T 130G 96% /mnt/backup1/customer3/bacula
Original Post:
capacity operations bandwidth
pool used avail read write read write
-------------------------------------- ----- ----- ----- ----- ----- -----
beast 14.1T 366G 0 155 0 3.91M
c7t6000402002FC424F6CF5317A00000000d0 7.07T 183G 0 31 0
16.2K
c7t6000402002FC424F6CF5318F00000000d0 7.07T 183G 0 124 0
3.90M
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