Stripe Volumes - SoftRAID Forum

RAID 5 in ThunderBay 4 Not Rebuilding

RiparianKit — Thu, 17 Aug 2023 17:32:17 +0000

SoftRAID reported that one of the drives in my ThunderBay 4 was likely to fail, so I replaced it with another similar drive (the same exact model was no longer available). However, since replacing the drive, my RAID has been in rebuilding status for almost two weeks. At the time of this post, the offset is 2,443,040,489,472 and the estimated time remaining is around 14 hours. However, the time remaining tracker will frequently go to hash marks and then restart the estimate.

I've mounted the drive and left it unmounted but with my machine running overnight. Neither action seems to help. What gives?

Optimizing (optimize) for ...

asergi — Thu, 07 Jul 2022 15:14:15 +0000

Is it ok to change the optimization setting on a drive currently in use (ie: RAID 5 about half full). Or will changing the optimization require re-formatting or otherwise erasing data? Would like to change from workstation to video optimization. Thx

RAID 0 with 3 drives only has 2x performances

BurningMan — Tue, 01 Mar 2022 18:29:34 +0000

Setting:

- 3x Samsung QVO 870 8TB

- Thunderbay 4 Mini enclosure

- macOS 12.2.1

- SoftRAID 6.2.1

BlackMagic speed for each drive individually ~520MB/s.

RAID0:~1000MB/s

RAID4: ~700MB/s

I would have expected RAID0 performance of around ~1.5GB/s and had hoped for RAID4 around ~1GB/s. Is this performance expected or is something wrong? What performance could I expect with a 4th drive?

Also, why do I need to restart SoftRAID after disabling safeguard to have it have an effect? Is that intentional?

RAID 0 Terribly Slow Performance.

jjsereday — Fri, 13 Aug 2021 17:05:13 +0000

Hello, I keep having R/W speed issues with my OWC ThunderBay 8 (TB3). I have 8x 8TB Seagate EXOS drives with 250/mbps sequential data rates RAID 0 which should give me outstanding performance. Of the 64TB I still have 20TB free.

I should be getting close to 2000/mbps but im am only getting 600W and 400R speeds!

(Yes I have everything backed up to the archive server and this is the active project drive filled with mostly video and photo files)

I understand I won't always have 2000r/w but this amount is so bad it makes me want to cry. Please help.

832 833

Can you mix drive sizes?

maxplanar — Sat, 06 Feb 2021 19:46:50 +0000

I have a 4-bay RAID with 4 x 3TB drives striped as RAID 0 using Apple RAID. I have a disk failing, and replaced it with a spare 6TB drive . But I still end up with a 12TB RAID, not 15TB. Can you combine different drive sizes in a SoftRAID and get that extra capacity?

Raid 1+ 0:

Rupp — Thu, 28 Jan 2021 22:25:42 +0000

I hope that I'm not in the wrong place, but I didn't see a 1+0 forum.

I've been using Thunderbays from OWC for various things including backup from my dedicated fast external hardware RAID. I was thinking that using a full 4 drive bay for a RAID 1+0 backup might be preferable with 4 8TB drives, to using larger drives for mirrors. Especially when on a beta version of SoftRAID instead of my non-functional licensed version, I was wondering:

Is this a good use for a RAID 1+0?

Is it safe enough for backup?

Is it really almost as fast as a RAID 5?

Is it relatively easy to restore?

It is 2 drive redundancy, right? Frankly, I haven't had to think about this in a while. Just need a little help and reassurance. Thanks.

Rebuild unnecessarily inefficient

SLeM — Fri, 08 Jan 2021 05:32:53 +0000

I created a RAID 5 across 3 drives, 500 GB total, HFS+. I did not write any files to the drive. I removed a drive from the RAID, and added it back in, triggering a rebuild.

The rebuild time for this newly-minted filesystem was given as over 1 hour. For no more than five files (.DS_store and some fseventd files.)

If you can build the initial empty filesystem in a small number of seconds, it would seem that you should be able to do much better than 1/2 TB per hour in rebuilding an empty filesystem.

Strip performance issue while creating RAID across PCIE slots

tksonix.uk — Mon, 21 Sep 2020 20:04:00 +0000

I bought two Accelssior 4m2 pcie raid card for my mac pro 2019, and put them in the two 8-lane slots.

I filled both card with Samsung 970 evo plus 500GB SSD, which has R/W speed of over 3000MB/s.

When I create RAID 0 volume by choosing 4 of the 8 drives, with 2 SSDs from one Accelssior card and 2 from the other.

In theory, each nvme SSD takes 4 lanes, then 2 of them on each card should max out the 8 lanes of the Accelssior card, so two Accelssior cards results in speed of 16 lanes.

If the above is correct, when I create RAID 0, in theory I should have over 10GB/s speed with PCIE 3.0 x16.

However, I only have maximum of 7000MB/s speed, which is only about PCIE 3.0 x8.

And by the way, with Apple raid in macos’s disk utility, if I create RAID using card from both Accelssior cards, it only gives me around 300MB/s speed, very strange.

Could someone explain this?

Replace one drive in a striped (level 0) disk array?

CJohnston — Sat, 15 Aug 2020 16:59:28 +0000

Hey all,

I have a disk that's predicted to fail and I wondered if I could pull out the single disk, clone it to another drive, and reinstall it and have the raid volume accept it back as part of the array?

Raid 1 very slow, and I/o requests ticking

edgardocontreras — Sat, 18 Jul 2020 01:45:19 +0000

I have 2 Thunderbay drives both using Raid 1. One runs perfectly but the other is really slow. I noticed that the I/o requests are increasing without pausing. About 200 per second.

Previously I had same speed problem and fixed it by deleting the Raid and creating it again. Everything worked great after that. But never noticed if I had the same I/o request problems.

Anyone knows what is the problem and possible solution?

Will really appreciate any help.