similar to: upgrade zfs stripe

Hi All, I am looking at ZFS and I get that they call it RAIDZ which is similar to RAID 5, but what about RAID 10? Isn''t a RAID 10 setup better for data protection? So if I have 8 x 1.5tb drives, wouldn''t I: - mirror drive 1 and 5 - mirror drive 2 and 6 - mirror drive 3 and 7 - mirror drive 4 and 8 Then stripe 1,2,3,4 Then stripe 5,6,7,8 How does one do this with ZFS?

Hi list, as this matter pops up every now and then in posts on this list I just want to clarify that the real performance of RaidZ (in its current implementation) is NOT anything that follows from raidz-style data efficient redundancy or the copy-on-write design used in ZFS. In a M-Way mirrored setup of N disks you get the write performance of the worst disk and a read performance that is

Hi, i''m new to the list so please bare with me. This isn''t an OpenSolaris related problem but i hope it''s still the right list to post to. I''m on the way to move a backup server to using zfs based storage, but i don''t want to spend too much drives to parity (the 16 drives are attached to a 3ware raid controller so i could also just use raid6 there). I

"Does raidzN actually protect against bitrot?" That''s a kind of radical, possibly offensive, question formula that I have lately. Reading up on theory of RAID5, I grasped the idea of the write hole (where one of the sectors of the stripe, such as the parity data, doesn''t get written - leading to invalid data upon read). In general, I think the same applies to bitrot of

I currently have a 7x1.5tb raidz1. I want to add "phase 2" which is another 7x1.5tb raidz1 Can I add the second phase to the first phase and basically have two raid5''s striped (in raid terms?) Yes, I probably should upgrade the zpool format too. Currently running snv_104. Also should upgrade to 110. If that is possible, would anyone happen to have the simple command lines to

Under Solaris 10 on a 4 core Sun Ultra 40 with 20GB RAM, I am setting up a Sun StorageTek 2540 with 12 300GB 15K RPM SAS drives and connected via load-shared 4Gbit FC links. This week I have tried many different configurations, using firmware managed RAID, ZFS managed RAID, and with the controller cache enabled or disabled. My objective is to obtain the best single-file write performance.

Hello, We have a new Thor here with 24TB of disk in (first of many, hopefully). We are trying to determine the bext practices with respect to file system management and sizing. Previously, we have tried to keep each file system to a max size of 500GB to make sure we could fit it all on a single tape, and to minimise restore times and impact should we experience some kind of volume

I have some questions about the choice of SSDs to use for ZIL and L2ARC. I''m trying to build an OpenSolaris iSCSI SAN out of a whitebox system, which is intended to be used as a backup SAN during storage migration, so it''s built on a tight budget. The system currently has 4GB RAM, 3GHz Core2-Quad and 8x 500GB WD REII SATA HDDs attached to an Areca 8port ARC-1220 controller

Hi, for zfs raidz1, I know for random io, iops of a raidz1 vdev eqaul to one physical disk iops, since raidz1 is like raid5 , so is raid5 has same performance like raidz1? ie. random iops equal to one physical disk''s ipos. Regards Victor -- This message posted from opensolaris.org

Hello, I was hoping that this would work: http://blogs.sun.com/zhangfan/entry/how_to_turn_a_mirror I have 4x(1TB) disks, one of which is filled with 800GB of data (that I cant delete/backup somewhere else) > root at FSK-Backup:~# zpool create -f ambry raidz1 c4t0d0 c5t0d0 c5t1d0 > /dev/lofi/1 > root at FSK-Backup:~# zpool list > NAME SIZE USED AVAIL CAP HEALTH ALTROOT

Hi all Is it possible to securely delete a file from a zfs dataset/zpool once it''s been snapshotted, meaning "delete (and perhaps overwrite) all copies of this file"? Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685 roy at karlsbakk.net http://blogg.karlsbakk.net/ -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et element?rt imperativ

Hello, As I understand it, in a traditional RAID 5 setup adding new disks to the pool provides more overall I/O as the load is spread out across multiple disks. What exactly is this relationship in a RAID-Z setup? What should one expect in terms of overall I/O performance as disks are added and/or removed? I understand that the checksum data is distributed across all disks, unlike a traditional

The default blocksize is 128K. If you are using mirrors, then each block on disk will be 128K whenever possible. But if you''re using raidzN with a capacity of M disks (M disks useful capacity + N disks redundancy) then the block size on each individual disk will be 128K / M. Right? This is one of the reasons the raidzN resilver code is inefficient. Since you end up waiting for the

I would have thought that the file movement from one FS to another within the same pool would be almost instantaneous. Why does it take to platter for such a movement? # time cp /tmp/blockfile /pcshare/1gb-tempfile real 0m5.758s # time mv /pcshare/1gb-tempfile . real 0m4.501s Both FSs are with compression=off. /tmp is RAM. -devsk -- This message posted from opensolaris.org

I have been searching this forum and just about every ZFS document i can find trying to find the answer to my questions. But i believe the answer i am looking for is not going to be documented and is probably best learned from experience. This is my first time playing around with open solaris and ZFS. I am in the midst of replacing my home based filed server. This server hosts all of my media

I have an odd setup at present, because I''m testing while still building my machine. It''s an Intel Atom D510 mobo running snv_134 2GB RAM with 2 SATA drives (AHCI): 1: Samsung 250GB old laptop drive 2: WD Green 1.5TB drive (idle3 turned off) Ultimately, it will be a time machine backup for my Mac laptop. So I have installed Netatalk 2.1.1 which is working great. Read

Hi all, I have been looking at various alternatives for a system that runs several Linux & Windows guests. So far my favorite choice would be OpenSolaris+ZFS+RAIDZ+VirtualBox. Is this combo ready to be a host for Linux & Windows guests? Or is it not 100% stable (yet)? Greetings, Evert This message posted from opensolaris.org

Hi All, Its been a while since I touched zfs. Is the below still the case with zfs and hardware raid array? Do we still need to provide two luns from the hardware raid then zfs mirror those two luns? http://www.opensolaris.org/os/community/zfs/faq/#hardwareraid Thanks, Shawn -- This message posted from opensolaris.org

Hi guys, I am about to reshape my data spool and am wondering what performance diff. I can expect from the new config. Vs. The old. The old config. Is a pool of a single vdev of 8 disks raidz2. The new pool config is 2vdev''s of 7 disk raidz2 in a single pool. I understand it should be better with higher io throughput....and better read/write rates...but interested to hear the science

Hi all, I have a home server based on SNV_127 with 8 disks; 2 x 500GB mirrored root pool 6 x 1TB raidz2 data pool This server performs a few functions; NFS : for several ''lab'' ESX virtual machines NFS : mythtv storage (videos, music, recordings etc) Samba : for home directories for all networked PCs I backup the important data to external USB hdd each day. I previously had